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Picking up a simulation fails when the model has OpenBoundaryConditions with a non-trivial scheme #5346

@tomchor

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@tomchor

I seem to get an error whenever I try to pickup a simulation using PerturbationAdvection. Here's a MWE:

using Oceananigans

grid = RectilinearGrid(size = (8, 8, 8), extent = (1, 1, 1))

w_bc = FieldBoundaryConditions(bottom=OpenBoundaryCondition(0; scheme = PerturbationAdvection()))
model = NonhydrostaticModel(grid, boundary_conditions = (w=w_bc,))
simulation = Simulation(model, Δt = 1, wall_time_limit = 1)

simulation.output_writers[:ckpt_writer] = Checkpointer(model;
                                                       schedule = TimeInterval(10),
                                                       overwrite_existing = true,
                                                       cleanup = true)

run!(simulation, pickup=false, checkpoint_at_end=true) # Run fresh simulation
run!(simulation, pickup=true) # Pickup simulation

On main this produces this error:

ERROR: MethodError: no method matching restore_prognostic_state!(::Float64, ::Float64)
The function `restore_prognostic_state!` exists, but no method is defined for this combination of argument types.

Closest candidates are:
  restore_prognostic_state!(::ZStarCoordinate, ::Any, ::Any)
   @ Oceananigans ~/repos/Oceananigans.jl/src/Models/HydrostaticFreeSurfaceModels/z_star_coordinate.jl:206
  restore_prognostic_state!(::Nothing, ::Any)
   @ Oceananigans ~/repos/Oceananigans.jl/src/OutputWriters/checkpointer.jl:209
  restore_prognostic_state!(::ZCoordinate, ::Any, ::Nothing)
   @ Oceananigans ~/repos/Oceananigans.jl/src/Models/HydrostaticFreeSurfaceModels/z_star_coordinate.jl:194
  ...

Stacktrace:
 [1] restore_prognostic_state!(restored::@NamedTuple{…}, from::@NamedTuple{…})
   @ Oceananigans.OutputWriters ~/repos/Oceananigans.jl/src/OutputWriters/checkpointer.jl:234
 [2] restore_prognostic_state!(restored::NonhydrostaticModel{…}, from::@NamedTuple{…})
   @ Oceananigans.Models.NonhydrostaticModels ~/repos/Oceananigans.jl/src/Models/NonhydrostaticModels/nonhydrostatic_model.jl:361
 [3] restore_prognostic_state!(restored::Simulation{…}, from::@NamedTuple{…})
   @ Oceananigans.Simulations ~/repos/Oceananigans.jl/src/Simulations/simulation.jl:299
 [4] set!(sim::Simulation{…}; checkpoint::Symbol, iteration::Nothing)
   @ Oceananigans.Simulations ~/repos/Oceananigans.jl/src/Simulations/run.jl:99
 [5] set!
   @ ~/repos/Oceananigans.jl/src/Simulations/run.jl:82 [inlined]
 [6] run!(sim::Simulation{…}; pickup::Bool, checkpoint_at_end::Bool)
   @ Oceananigans.Simulations ~/repos/Oceananigans.jl/src/Simulations/run.jl:141

This seems to be related to different types for boundary_mass_flux elements in the restored model than the from model when restoring.

cc @ali-ramadhan

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