elixir_euler_free_stream_boundaries_float32.jl

# Similar to p4est_3d_dgsem/elixir_euler_free_stream_boundaries.jl
# but using Float32 instead of the default Float64

using OrdinaryDiffEqLowStorageRK
using Trixi

###############################################################################
# semidiscretization of the compressible Euler equations

equations = CompressibleEulerEquations3D(1.4f0)

initial_condition = initial_condition_constant

polydeg = 3
# Up to version 0.13.0, `max_abs_speed_naive` was used as the default wave speed estimate of
# `const flux_lax_friedrichs = FluxLaxFriedrichs(), i.e., `FluxLaxFriedrichs(max_abs_speed = max_abs_speed_naive)`.
# In the `StepsizeCallback`, though, the less diffusive `max_abs_speeds` is employed which is consistent with `max_abs_speed`.
# Thus, we exchanged in PR#2458 the default wave speed used in the LLF flux to `max_abs_speed`.
# To ensure that every example still runs we specify explicitly `FluxLaxFriedrichs(max_abs_speed_naive)`.
# We remark, however, that the now default `max_abs_speed` is in general recommended due to compliance with the 
# `StepsizeCallback` (CFL-Condition) and less diffusion.
solver = DGSEM(polydeg = polydeg, surface_flux = FluxLaxFriedrichs(max_abs_speed_naive),
               RealT = Float32)

###############################################################################
# Get the uncurved mesh from a file (downloads the file if not available locally)

default_mesh_file = joinpath(@__DIR__, "mesh_cube_with_boundaries.inp")
isfile(default_mesh_file) ||
    Trixi.download("https://gist.githubusercontent.com/DanielDoehring/710eab379fe3042dc08af6f2d1076e49/raw/38e9803bc0dab9b32a61d9542feac5343c3e6f4b/mesh_cube_with_boundaries.inp",
                   default_mesh_file)
mesh_file = default_mesh_file

boundary_symbols = [:PhysicalSurface1, :PhysicalSurface2]

mesh = P4estMesh{3}(mesh_file, polydeg = polydeg, boundary_symbols = boundary_symbols,
                    RealT = Float32)

boundary_conditions = Dict(:PhysicalSurface1 => BoundaryConditionDirichlet(initial_condition),
                           :PhysicalSurface2 => BoundaryConditionDirichlet(initial_condition))

semi = SemidiscretizationHyperbolic(mesh, equations, initial_condition, solver,
                                    boundary_conditions = boundary_conditions)

###############################################################################
# ODE solvers, callbacks etc.

tspan = (0.0f0, 1.0f0)
ode = semidiscretize(semi, tspan)

summary_callback = SummaryCallback()

analysis_interval = 100
analysis_callback = AnalysisCallback(semi, interval = analysis_interval)

alive_callback = AliveCallback(analysis_interval = analysis_interval)

stepsize_callback = StepsizeCallback(cfl = 1.5f0)

callbacks = CallbackSet(summary_callback,
                        analysis_callback, alive_callback,
                        stepsize_callback)

###############################################################################
# run the simulation

sol = solve(ode, CarpenterKennedy2N54(williamson_condition = false);
            dt = 1.0f0, # solve needs some value here but it will be overwritten by the stepsize_callback
            ode_default_options()..., callback = callbacks);