Sea ice advected by an atmospheric anticyclone

using ClimaSeaIce
using ClimaSeaIce.SeaIceMomentumEquations
using ClimaSeaIce.Rheologies
using Oceananigans
using Oceananigans.Units
using Oceananigans.Operators
using Oceananigans.BoundaryConditions
using Printf
using CairoMakie

The experiment found in the paper: Simulating Linear Kinematic Features in Viscous-Plastic Sea Ice Models on Quadrilateral and Triangular Grids With Different Variable Staggering

arch = CPU()

L  = 512kilometers
𝓋ₒ = 0.01 # m / s maximum ocean speed
𝓋ₐ = 30.0 # m / s maximum atmospheric speed modifier

30.0

2 km domain

grid = RectilinearGrid(arch;
                       size = (128, 128),
                          x = (0, L),
                          y = (0, L),
                       halo = (7, 7),
                   topology = (Bounded, Bounded, Flat))

#####
##### Value boundary conditions for velocities
#####

u_bcs = FieldBoundaryConditions(north=ValueBoundaryCondition(0),
                                south=ValueBoundaryCondition(0))

v_bcs = FieldBoundaryConditions(west=ValueBoundaryCondition(0),
                                east=ValueBoundaryCondition(0))

#####
##### Ocean sea-ice stress
#####

Oceananigans.FieldBoundaryConditions, with boundary conditions
├── west: ValueBoundaryCondition: 0
├── east: ValueBoundaryCondition: 0
├── south: DefaultBoundaryCondition (FluxBoundaryCondition: Nothing)
├── north: DefaultBoundaryCondition (FluxBoundaryCondition: Nothing)
├── bottom: DefaultBoundaryCondition (FluxBoundaryCondition: Nothing)
├── top: DefaultBoundaryCondition (FluxBoundaryCondition: Nothing)
└── immersed: DefaultBoundaryCondition (FluxBoundaryCondition: Nothing)

Constant ocean velocities corresponding to a cyclonic eddy

Uₒ = XFaceField(grid)
Vₒ = YFaceField(grid)

set!(Uₒ, (x, y) -> 𝓋ₒ * (2y - L) / L)
set!(Vₒ, (x, y) -> 𝓋ₒ * (L - 2x) / L)
fill_halo_regions!((Uₒ, Vₒ))

τₒ = SemiImplicitStress(uₑ=Uₒ, vₑ=Vₒ)

####
#### Atmosphere - sea ice stress
####

Uₐ = XFaceField(grid)
Vₐ = YFaceField(grid)

128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
├── boundary conditions: FieldBoundaryConditions
│   └── west: ZeroFlux, east: ZeroFlux, south: Nothing, north: Nothing, bottom: Nothing, top: Nothing, immersed: ZeroFlux
└── data: 142×143×1 OffsetArray(::Array{Float64, 3}, -6:135, -6:136, 1:1) with eltype Float64 with indices -6:135×-6:136×1:1
    └── max=0.0, min=0.0, mean=0.0

Atmospheric velocities corresponding to an anticyclonic eddy moving north-east

@inline center(t) = 256kilometers + 51.2kilometers * t / 86400
@inline radius(x, y, t)  = sqrt((x - center(t))^2 + (y - center(t))^2)
@inline speed(x, y, t)   = 1 / 100 * exp(- radius(x, y, t) / 100kilometers)

@inline ua_time(x, y, t) = - 𝓋ₐ * speed(x, y, t) * (cosd(72) * (x - center(t)) + sind(72) * (y - center(t))) / 1000
@inline va_time(x, y, t) = - 𝓋ₐ * speed(x, y, t) * (cosd(72) * (y - center(t)) - sind(72) * (x - center(t))) / 1000

va_time (generic function with 1 method)

Initialize the stress at time t = 0

set!(Uₐ, (x, y) -> ua_time(x, y, 0))
set!(Vₐ, (x, y) -> va_time(x, y, 0))

fill_halo_regions!((Uₐ, Vₐ))

τₐu = - Uₐ * sqrt(Uₐ^2 + Vₐ^2) * 1.3 * 1.2e-3
τₐv = - Vₐ * sqrt(Uₐ^2 + Vₐ^2) * 1.3 * 1.2e-3

#####
##### Numerical details
#####

BinaryOperation at (Center, Face, Center)
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
└── tree: 
    * at (Center, Face, Center)
    ├── * at (Center, Face, Center)
    │   ├── * at (Center, Face, Center)
    │   │   ├── - at (Center, Face, Center) via identity
    │   │   │   └── 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
    │   │   └── sqrt at (Face, Center, Center) via identity
        │   │   └── + at (Face, Center, Center)
            │   │   ├── ^ at (Face, Center, Center)
            │   │   │   ├── 129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
            │   │   │   └── 2
            │   │   └── ^ at (Center, Face, Center)
                │   │   ├── 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
                │   │   └── 2
    │   └── 1.3
    └── 0.0012

We use an elasto-visco-plastic rheology and WENO seventh order for advection of h and ℵ

momentum_equations = SeaIceMomentumEquation(grid;
                                            top_momentum_stress = (u=τₐu, v=τₐv),
                                            bottom_momentum_stress = τₒ,
                                            coriolis = FPlane(f=1e-4),
                                            ocean_velocities = (u = Uₒ, v = Vₒ),
                                            rheology = ElastoViscoPlasticRheology(),
                                            solver   = SplitExplicitSolver(substeps=150))

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Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Int64, typeof(Oceananigans.Operators.identity5), typeof(Oceananigans.Operators.identity1), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, typeof(^), Oceananigans.Fields.Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Int64, typeof(Oceananigans.Operators.identity2), typeof(Oceananigans.Operators.identity3), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, typeof(Oceananigans.Operators.identity4), typeof(Oceananigans.Operators.ℑxyᶠᶜᵃ), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, typeof(Oceananigans.Operators.identity5), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, typeof(Oceananigans.Operators.identity1), typeof(Oceananigans.Operators.identity2), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Float64, typeof(Oceananigans.Operators.identity3), typeof(Oceananigans.Operators.identity4), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Float64, typeof(Oceananigans.Operators.identity5), typeof(Oceananigans.Operators.identity1), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, v::Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, typeof(*), Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, typeof(*), Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, typeof(*), Oceananigans.AbstractOperations.UnaryOperation{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, typeof(-), Oceananigans.Fields.Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, typeof(Oceananigans.Operators.identity2), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Oceananigans.AbstractOperations.UnaryOperation{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center, typeof(sqrt), Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center, typeof(+), Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center, typeof(^), Oceananigans.Fields.Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Int64, typeof(Oceananigans.Operators.identity3), typeof(Oceananigans.Operators.identity4), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Oceananigans.AbstractOperations.BinaryOperation{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, typeof(^), Oceananigans.Fields.Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Int64, typeof(Oceananigans.Operators.identity5), typeof(Oceananigans.Operators.identity1), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, typeof(Oceananigans.Operators.identity2), typeof(Oceananigans.Operators.ℑxyᶠᶜᵃ), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, typeof(Oceananigans.Operators.identity3), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, typeof(Oceananigans.Operators.identity4), typeof(Oceananigans.Operators.ℑxyᶜᶠᵃ), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Float64, typeof(Oceananigans.Operators.identity5), typeof(Oceananigans.Operators.identity1), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}, Float64, typeof(Oceananigans.Operators.identity2), typeof(Oceananigans.Operators.identity3), Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Float64}}, bottom::ClimaSeaIce.SeaIceMomentumEquations.SemiImplicitStress{Oceananigans.Fields.Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Oceananigans.Fields.Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Float64}}, Float64}(FPlane{Float64}(f=0.0001), ClimaSeaIce.Rheologies.ElastoViscoPlasticRheology{Float64}(27500.0, 20.0, 2.0, 2.0e-9, 50.0, 300.0), NamedTuple with 9 Fields on 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo:
├── σ₁₁: 128×128×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── σ₂₂: 128×128×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── σ₁₂: 129×129×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Face, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── ζ: 128×128×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── Δ: 128×128×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── α: 128×128×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── uⁿ: 129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── vⁿ: 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
└── P: 128×128×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing} reduced over dims = (3,) on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU, ClimaSeaIce.SeaIceMomentumEquations.SplitExplicitSolver(150), NamedTuple with 2 Fields on 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo:
├── u: 129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
└── v: 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU, (top = (u = BinaryOperation at (Face, Center, Center)
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
└── tree: 
    * at (Face, Center, Center)
    ├── * at (Face, Center, Center)
    │   ├── * at (Face, Center, Center)
    │   │   ├── - at (Face, Center, Center) via identity
    │   │   │   └── 129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
    │   │   └── sqrt at (Face, Center, Center) via identity
        │   │   └── + at (Face, Center, Center)
            │   │   ├── ^ at (Face, Center, Center)
            │   │   │   ├── 129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
            │   │   │   └── 2
            │   │   └── ^ at (Center, Face, Center)
                │   │   ├── 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
                │   │   └── 2
    │   └── 1.3
    └── 0.0012, v = BinaryOperation at (Center, Face, Center)
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
└── tree: 
    * at (Center, Face, Center)
    ├── * at (Center, Face, Center)
    │   ├── * at (Center, Face, Center)
    │   │   ├── - at (Center, Face, Center) via identity
    │   │   │   └── 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
    │   │   └── sqrt at (Face, Center, Center) via identity
        │   │   └── + at (Face, Center, Center)
            │   │   ├── ^ at (Face, Center, Center)
            │   │   │   ├── 129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
            │   │   │   └── 2
            │   │   └── ^ at (Center, Face, Center)
                │   │   ├── 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
                │   │   └── 2
    │   └── 1.3
    └── 0.0012), bottom = ClimaSeaIce.SeaIceMomentumEquations.SemiImplicitStress{Oceananigans.Fields.Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Oceananigans.Fields.Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center, Nothing, Oceananigans.Grids.RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat, Oceananigans.Grids.StaticVerticalDiscretization{Nothing, Nothing, Float64, Float64}, Float64, Float64, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, OffsetArrays.OffsetVector{Float64, StepRangeLen{Float64, Base.TwicePrecision{Float64}, Base.TwicePrecision{Float64}, Int64}}, Oceananigans.Architectures.CPU}, Tuple{Colon, Colon, Colon}, OffsetArrays.OffsetArray{Float64, 3, Array{Float64, 3}}, Float64, Oceananigans.BoundaryConditions.FieldBoundaryConditions{Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}, Nothing, Nothing, Nothing, Nothing, Oceananigans.BoundaryConditions.BoundaryCondition{Oceananigans.BoundaryConditions.Flux, Nothing}}, Nothing, Oceananigans.Fields.FieldBoundaryBuffers{Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing}}, Float64}(129×128×1 Field{Oceananigans.Grids.Face, Oceananigans.Grids.Center, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
├── boundary conditions: FieldBoundaryConditions
│   └── west: Nothing, east: Nothing, south: ZeroFlux, north: ZeroFlux, bottom: Nothing, top: Nothing, immersed: ZeroFlux
└── data: 143×142×1 OffsetArray(::Array{Float64, 3}, -6:136, -6:135, 1:1) with eltype Float64 with indices -6:136×-6:135×1:1
    └── max=0.00992188, min=-0.00992188, mean=-2.50039e-20, 128×129×1 Field{Oceananigans.Grids.Center, Oceananigans.Grids.Face, Oceananigans.Grids.Center} on Oceananigans.Grids.RectilinearGrid on Oceananigans.Architectures.CPU
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
├── boundary conditions: FieldBoundaryConditions
│   └── west: ZeroFlux, east: ZeroFlux, south: Nothing, north: Nothing, bottom: Nothing, top: Nothing, immersed: ZeroFlux
└── data: 142×143×1 OffsetArray(::Array{Float64, 3}, -6:135, -6:136, 1:1) with eltype Float64 with indices -6:135×-6:136×1:1
    └── max=0.00992188, min=-0.00992188, mean=-1.05058e-22, 1026.0, 0.0055)), 0.001, 1.0)

Define the model!

model = SeaIceModel(grid;
                    dynamics = momentum_equations,
                    ice_thermodynamics = nothing, # No ice_thermodynamics here
                    advection = WENO(order=7),
                    boundary_conditions = (u=u_bcs, v=v_bcs))

SeaIceModel{Oceananigans.Architectures.CPU, Oceananigans.Grids.RectilinearGrid}(time = 0 seconds, iteration = 0)
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
├── ice_thermodynamics: Nothing
├── advection: WENO(order=7)
└── external_heat_fluxes: 
    ├── top: Nothing
    └── bottom: 0

We start with a concentration of ℵ = 1 and an initial height field with perturbations around 0.3 m

h₀(x, y) = 0.3 + 0.005 * (sin(60 * x / 1000kilometers) + sin(30 * y / 1000kilometers))

set!(model, h = h₀)
set!(model, ℵ = 1)

#####
##### Setup the simulation
#####

run the model for 2 days

simulation = Simulation(model, Δt = 2minutes, stop_time = 2days)

Simulation of SeaIceModel
├── Next time step: 2 minutes
├── Elapsed wall time: 0 seconds
├── Wall time per iteration: NaN days
├── Stop time: 2 days
├── Stop iteration: Inf
├── Wall time limit: Inf
├── Minimum relative step: 0.0
├── Callbacks: OrderedDict with 3 entries:
│   ├── stop_time_exceeded => Callback of stop_time_exceeded on IterationInterval(1)
│   ├── stop_iteration_exceeded => Callback of stop_iteration_exceeded on IterationInterval(1)
│   └── wall_time_limit_exceeded => Callback of wall_time_limit_exceeded on IterationInterval(1)
├── Output writers: OrderedDict with no entries
└── Diagnostics: OrderedDict with no entries

Remember to evolve the wind stress field in time!

function compute_wind_stress(sim)
    time = sim.model.clock.time
    @inline ua(x, y) = ua_time(x, y, time)
    @inline va(x, y) = va_time(x, y, time)
    set!(Uₐ, ua)
    set!(Vₐ, va)

    fill_halo_regions!((Uₐ, Vₐ))

    return nothing
end

simulation.callbacks[:top_stress] = Callback(compute_wind_stress, IterationInterval(1))

h = model.ice_thickness
ℵ = model.ice_concentration
u, v = model.velocities

outputs = (; h, u, v, ℵ)

simulation.output_writers[:sea_ice] = JLD2Writer(model, outputs;
                                                       filename = "sea_ice_advected_by_anticyclone.jld2",
                                                       schedule = IterationInterval(5),
                                                       overwrite_existing = true)

wall_time = [time_ns()]

function progress(sim)
    h = sim.model.ice_thickness
    ℵ = sim.model.ice_concentration
    u = sim.model.velocities.u
    v = sim.model.velocities.v

    hmax = maximum(interior(h))
    ℵmin = minimum(interior(ℵ))
    umax = maximum(interior(u)), maximum(interior(v))
    step_time = 1e-9 * (time_ns() - wall_time[1])

    @info @sprintf("Time: %s, Iteration %d, Δt %s, max(vel): (%.2e, %.2e), max(h): %.2f, min(ℵ): %.2f, wtime: %s \n",
                   prettytime(sim.model.clock.time),
                   sim.model.clock.iteration,
                   prettytime(sim.Δt),
                   umax..., hmax, ℵmin, prettytime(step_time))

     wall_time[1] = time_ns()
end

simulation.callbacks[:progress] = Callback(progress, IterationInterval(5))

run!(simulation)

using CairoMakie

htimeseries = FieldTimeSeries("sea_ice_advected_by_anticyclone.jld2", "h")
utimeseries = FieldTimeSeries("sea_ice_advected_by_anticyclone.jld2", "u")
vtimeseries = FieldTimeSeries("sea_ice_advected_by_anticyclone.jld2", "v")
ℵtimeseries = FieldTimeSeries("sea_ice_advected_by_anticyclone.jld2", "ℵ")

128×128×1×289 FieldTimeSeries{Oceananigans.OutputReaders.InMemory} located at (Center, Center, ⋅) of ℵ at sea_ice_advected_by_anticyclone.jld2
├── grid: 128×128×1 RectilinearGrid{Float64, Oceananigans.Grids.Bounded, Oceananigans.Grids.Bounded, Oceananigans.Grids.Flat} on Oceananigans.Architectures.CPU with 7×7×0 halo
├── indices: (:, :, :)
├── time_indexing: Linear()
├── backend: InMemory()
├── path: sea_ice_advected_by_anticyclone.jld2
├── name: ℵ
└── data: 142×142×1×289 OffsetArray(::Array{Float64, 4}, -6:135, -6:135, 1:1, 1:289) with eltype Float64 with indices -6:135×-6:135×1:1×1:289
    └── max=1.0, min=0.0, mean=0.832103

Visualize!

Nt = length(htimeseries)
iter = Observable(1)

hi = @lift(htimeseries[$iter])
ℵi = @lift(ℵtimeseries[$iter])
ui = @lift(utimeseries[$iter])
vi = @lift(vtimeseries[$iter])

fig = Figure()
ax = Axis(fig[1, 1], title = "sea ice thickness")
heatmap!(ax, hi, colormap = :magma, colorrange = (0.23, 0.37))

ax = Axis(fig[1, 2], title = "sea ice concentration")
heatmap!(ax, ℵi, colormap = Reverse(:deep), colorrange = (0.9, 1))

ax = Axis(fig[2, 1], title = "zonal velocity")
heatmap!(ax, ui, colorrange = (-0.1, 0.1))

ax = Axis(fig[2, 2], title = "meridional velocity")
heatmap!(ax, vi, colorrange = (-0.1, 0.1))

CairoMakie.record(fig, "sea_ice_advected_by_anticyclone.mp4", 1:Nt, framerate = 8) do i
    iter[] = i
    @info "doing iter $i"
end

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