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Adding parabolic terms for 3D P4estMesh
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examples/p4est_3d_dgsem/elixir_navierstokes_convergence.jl
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using OrdinaryDiffEq | ||
using Trixi | ||
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############################################################################### | ||
# semidiscretization of the ideal compressible Navier-Stokes equations | ||
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prandtl_number() = 0.72 | ||
mu() = 0.01 | ||
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equations = CompressibleEulerEquations3D(1.4) | ||
equations_parabolic = CompressibleNavierStokesDiffusion3D(equations, mu=mu(), Prandtl=prandtl_number(), | ||
gradient_variables=GradientVariablesPrimitive()) | ||
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# Create DG solver with polynomial degree = 3 and (local) Lax-Friedrichs/Rusanov flux as surface flux | ||
solver = DGSEM(polydeg=3, surface_flux=flux_lax_friedrichs, | ||
volume_integral=VolumeIntegralWeakForm()) | ||
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coordinates_min = (-1.0, -1.0, -1.0) # minimum coordinates (min(x), min(y), min(z)) | ||
coordinates_max = ( 1.0, 1.0, 1.0) # maximum coordinates (max(x), max(y), max(z)) | ||
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trees_per_dimension = (2, 2, 2) | ||
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mesh = P4estMesh(trees_per_dimension, polydeg=3, | ||
coordinates_min=coordinates_min, coordinates_max=coordinates_max, | ||
periodicity=(true, false, true), initial_refinement_level=2) | ||
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# Note: the initial condition cannot be specialized to `CompressibleNavierStokesDiffusion3D` | ||
# since it is called by both the parabolic solver (which passes in `CompressibleNavierStokesDiffusion3D`) | ||
# and by the initial condition (which passes in `CompressibleEulerEquations3D`). | ||
# This convergence test setup was originally derived by Andrew Winters (@andrewwinters5000) | ||
function initial_condition_navier_stokes_convergence_test(x, t, equations) | ||
# Constants. OBS! Must match those in `source_terms_navier_stokes_convergence_test` | ||
c = 2.0 | ||
A1 = 0.5 | ||
A2 = 1.0 | ||
A3 = 0.5 | ||
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# Convenience values for trig. functions | ||
pi_x = pi * x[1] | ||
pi_y = pi * x[2] | ||
pi_z = pi * x[3] | ||
pi_t = pi * t | ||
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rho = c + A1 * sin(pi_x) * cos(pi_y) * sin(pi_z) * cos(pi_t) | ||
v1 = A2 * sin(pi_x) * log(x[2] + 2.0) * (1.0 - exp(-A3 * (x[2] - 1.0))) * sin(pi_z) * cos(pi_t) | ||
v2 = v1 | ||
v3 = v1 | ||
p = rho^2 | ||
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return prim2cons(SVector(rho, v1, v2, v3, p), equations) | ||
end | ||
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@inline function source_terms_navier_stokes_convergence_test(u, x, t, equations) | ||
# TODO: parabolic | ||
# we currently need to hardcode these parameters until we fix the "combined equation" issue | ||
# see also https://github.com/trixi-framework/Trixi.jl/pull/1160 | ||
inv_gamma_minus_one = inv(equations.gamma - 1) | ||
Pr = prandtl_number() | ||
mu_ = mu() | ||
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# Constants. OBS! Must match those in `initial_condition_navier_stokes_convergence_test` | ||
c = 2.0 | ||
A1 = 0.5 | ||
A2 = 1.0 | ||
A3 = 0.5 | ||
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# Convenience values for trig. functions | ||
pi_x = pi * x[1] | ||
pi_y = pi * x[2] | ||
pi_z = pi * x[3] | ||
pi_t = pi * t | ||
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# Define auxiliary functions for the strange function of the y variable | ||
# to make expressions easier to read | ||
g = log(x[2] + 2.0) * (1.0 - exp(-A3 * (x[2] - 1.0))) | ||
g_y = ( A3 * log(x[2] + 2.0) * exp(-A3 * (x[2] - 1.0)) | ||
+ (1.0 - exp(-A3 * (x[2] - 1.0))) / (x[2] + 2.0) ) | ||
g_yy = ( 2.0 * A3 * exp(-A3 * (x[2] - 1.0)) / (x[2] + 2.0) | ||
- (1.0 - exp(-A3 * (x[2] - 1.0))) / ((x[2] + 2.0)^2) | ||
- A3^2 * log(x[2] + 2.0) * exp(-A3 * (x[2] - 1.0)) ) | ||
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# Density and its derivatives | ||
rho = c + A1 * sin(pi_x) * cos(pi_y) * sin(pi_z) * cos(pi_t) | ||
rho_t = -pi * A1 * sin(pi_x) * cos(pi_y) * sin(pi_z) * sin(pi_t) | ||
rho_x = pi * A1 * cos(pi_x) * cos(pi_y) * sin(pi_z) * cos(pi_t) | ||
rho_y = -pi * A1 * sin(pi_x) * sin(pi_y) * sin(pi_z) * cos(pi_t) | ||
rho_z = pi * A1 * sin(pi_x) * cos(pi_y) * cos(pi_z) * cos(pi_t) | ||
rho_xx = -pi^2 * (rho - c) | ||
rho_yy = -pi^2 * (rho - c) | ||
rho_zz = -pi^2 * (rho - c) | ||
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# Velocities and their derivatives | ||
# v1 terms | ||
v1 = A2 * sin(pi_x) * g * sin(pi_z) * cos(pi_t) | ||
v1_t = -pi * A2 * sin(pi_x) * g * sin(pi_z) * sin(pi_t) | ||
v1_x = pi * A2 * cos(pi_x) * g * sin(pi_z) * cos(pi_t) | ||
v1_y = A2 * sin(pi_x) * g_y * sin(pi_z) * cos(pi_t) | ||
v1_z = pi * A2 * sin(pi_x) * g * cos(pi_z) * cos(pi_t) | ||
v1_xx = -pi^2 * v1 | ||
v1_yy = A2 * sin(pi_x) * g_yy * sin(pi_z) * cos(pi_t) | ||
v1_zz = -pi^2 * v1 | ||
v1_xy = pi * A2 * cos(pi_x) * g_y * sin(pi_z) * cos(pi_t) | ||
v1_xz = pi^2 * A2 * cos(pi_x) * g * cos(pi_z) * cos(pi_t) | ||
v1_yz = pi * A2 * sin(pi_x) * g_y * cos(pi_z) * cos(pi_t) | ||
# v2 terms (simplifies from ansatz) | ||
v2 = v1 | ||
v2_t = v1_t | ||
v2_x = v1_x | ||
v2_y = v1_y | ||
v2_z = v1_z | ||
v2_xx = v1_xx | ||
v2_yy = v1_yy | ||
v2_zz = v1_zz | ||
v2_xy = v1_xy | ||
v2_yz = v1_yz | ||
# v3 terms (simplifies from ansatz) | ||
v3 = v1 | ||
v3_t = v1_t | ||
v3_x = v1_x | ||
v3_y = v1_y | ||
v3_z = v1_z | ||
v3_xx = v1_xx | ||
v3_yy = v1_yy | ||
v3_zz = v1_zz | ||
v3_xz = v1_xz | ||
v3_yz = v1_yz | ||
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# Pressure and its derivatives | ||
p = rho^2 | ||
p_t = 2.0 * rho * rho_t | ||
p_x = 2.0 * rho * rho_x | ||
p_y = 2.0 * rho * rho_y | ||
p_z = 2.0 * rho * rho_z | ||
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# Total energy and its derivatives; simiplifies from ansatz that v2 = v1 and v3 = v1 | ||
E = p * inv_gamma_minus_one + 1.5 * rho * v1^2 | ||
E_t = p_t * inv_gamma_minus_one + 1.5 * rho_t * v1^2 + 3.0 * rho * v1 * v1_t | ||
E_x = p_x * inv_gamma_minus_one + 1.5 * rho_x * v1^2 + 3.0 * rho * v1 * v1_x | ||
E_y = p_y * inv_gamma_minus_one + 1.5 * rho_y * v1^2 + 3.0 * rho * v1 * v1_y | ||
E_z = p_z * inv_gamma_minus_one + 1.5 * rho_z * v1^2 + 3.0 * rho * v1 * v1_z | ||
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# Divergence of Fick's law ∇⋅∇q = kappa ∇⋅∇T; simplifies because p = rho², so T = p/rho = rho | ||
kappa = equations.gamma * inv_gamma_minus_one / Pr | ||
q_xx = kappa * rho_xx # kappa T_xx | ||
q_yy = kappa * rho_yy # kappa T_yy | ||
q_zz = kappa * rho_zz # kappa T_zz | ||
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# Stress tensor and its derivatives (exploit symmetry) | ||
tau11 = 4.0 / 3.0 * v1_x - 2.0 / 3.0 * (v2_y + v3_z) | ||
tau12 = v1_y + v2_x | ||
tau13 = v1_z + v3_x | ||
tau22 = 4.0 / 3.0 * v2_y - 2.0 / 3.0 * (v1_x + v3_z) | ||
tau23 = v2_z + v3_y | ||
tau33 = 4.0 / 3.0 * v3_z - 2.0 / 3.0 * (v1_x + v2_y) | ||
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tau11_x = 4.0 / 3.0 * v1_xx - 2.0 / 3.0 * (v2_xy + v3_xz) | ||
tau12_x = v1_xy + v2_xx | ||
tau13_x = v1_xz + v3_xx | ||
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tau12_y = v1_yy + v2_xy | ||
tau22_y = 4.0 / 3.0 * v2_yy - 2.0 / 3.0 * (v1_xy + v3_yz) | ||
tau23_y = v2_yz + v3_yy | ||
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tau13_z = v1_zz + v3_xz | ||
tau23_z = v2_zz + v3_yz | ||
tau33_z = 4.0 / 3.0 * v3_zz - 2.0 / 3.0 * (v1_xz + v2_yz) | ||
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# Compute the source terms | ||
# Density equation | ||
du1 = ( rho_t + rho_x * v1 + rho * v1_x | ||
+ rho_y * v2 + rho * v2_y | ||
+ rho_z * v3 + rho * v3_z ) | ||
# x-momentum equation | ||
du2 = ( rho_t * v1 + rho * v1_t + p_x + rho_x * v1^2 | ||
+ 2.0 * rho * v1 * v1_x | ||
+ rho_y * v1 * v2 | ||
+ rho * v1_y * v2 | ||
+ rho * v1 * v2_y | ||
+ rho_z * v1 * v3 | ||
+ rho * v1_z * v3 | ||
+ rho * v1 * v3_z | ||
- mu_ * (tau11_x + tau12_y + tau13_z) ) | ||
# y-momentum equation | ||
du3 = ( rho_t * v2 + rho * v2_t + p_y + rho_x * v1 * v2 | ||
+ rho * v1_x * v2 | ||
+ rho * v1 * v2_x | ||
+ rho_y * v2^2 | ||
+ 2.0 * rho * v2 * v2_y | ||
+ rho_z * v2 * v3 | ||
+ rho * v2_z * v3 | ||
+ rho * v2 * v3_z | ||
- mu_ * (tau12_x + tau22_y + tau23_z) ) | ||
# z-momentum equation | ||
du4 = ( rho_t * v3 + rho * v3_t + p_z + rho_x * v1 * v3 | ||
+ rho * v1_x * v3 | ||
+ rho * v1 * v3_x | ||
+ rho_y * v2 * v3 | ||
+ rho * v2_y * v3 | ||
+ rho * v2 * v3_y | ||
+ rho_z * v3^2 | ||
+ 2.0 * rho * v3 * v3_z | ||
- mu_ * (tau13_x + tau23_y + tau33_z) ) | ||
# Total energy equation | ||
du5 = ( E_t + v1_x * (E + p) + v1 * (E_x + p_x) | ||
+ v2_y * (E + p) + v2 * (E_y + p_y) | ||
+ v3_z * (E + p) + v3 * (E_z + p_z) | ||
# stress tensor and temperature gradient from x-direction | ||
- mu_ * ( q_xx + v1_x * tau11 + v2_x * tau12 + v3_x * tau13 | ||
+ v1 * tau11_x + v2 * tau12_x + v3 * tau13_x) | ||
# stress tensor and temperature gradient terms from y-direction | ||
- mu_ * ( q_yy + v1_y * tau12 + v2_y * tau22 + v3_y * tau23 | ||
+ v1 * tau12_y + v2 * tau22_y + v3 * tau23_y) | ||
# stress tensor and temperature gradient terms from z-direction | ||
- mu_ * ( q_zz + v1_z * tau13 + v2_z * tau23 + v3_z * tau33 | ||
+ v1 * tau13_z + v2 * tau23_z + v3 * tau33_z) ) | ||
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return SVector(du1, du2, du3, du4, du5) | ||
end | ||
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initial_condition = initial_condition_navier_stokes_convergence_test | ||
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# BC types | ||
velocity_bc_top_bottom = NoSlip((x, t, equations) -> initial_condition_navier_stokes_convergence_test(x, t, equations)[2:4]) | ||
heat_bc_top_bottom = Adiabatic((x, t, equations) -> 0.0) | ||
boundary_condition_top_bottom = BoundaryConditionNavierStokesWall(velocity_bc_top_bottom, heat_bc_top_bottom) | ||
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# define inviscid boundary conditions | ||
# boundary_conditions = Dict( | ||
# :y_neg => boundary_condition_slip_wall, | ||
# :y_pos => boundary_condition_slip_wall | ||
# ) | ||
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boundary_conditions = Dict( :x_neg => boundary_condition_periodic, | ||
:x_pos => boundary_condition_periodic, | ||
:y_neg => boundary_condition_slip_wall, | ||
:y_pos => boundary_condition_slip_wall, | ||
:z_neg => boundary_condition_periodic, | ||
:z_pos => boundary_condition_periodic) | ||
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# define viscous boundary conditions | ||
# boundary_conditions_parabolic = Dict( | ||
# :y_neg => boundary_condition_top_bottom, | ||
# :y_pos => boundary_condition_top_bottom | ||
# ) | ||
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boundary_conditions_parabolic = Dict( :x_neg => boundary_condition_periodic, | ||
:x_pos => boundary_condition_periodic, | ||
:y_neg => boundary_condition_top_bottom, | ||
:y_pos => boundary_condition_top_bottom, | ||
:z_neg => boundary_condition_periodic, | ||
:z_pos => boundary_condition_periodic) | ||
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semi = SemidiscretizationHyperbolicParabolic(mesh, (equations, equations_parabolic), initial_condition, solver; | ||
boundary_conditions=(boundary_conditions, boundary_conditions_parabolic), | ||
source_terms=source_terms_navier_stokes_convergence_test) | ||
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############################################################################### | ||
# ODE solvers, callbacks etc. | ||
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# Create ODE problem with time span `tspan` | ||
tspan = (0.0, 1.0) | ||
ode = semidiscretize(semi, tspan) | ||
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summary_callback = SummaryCallback() | ||
alive_callback = AliveCallback(alive_interval=10) | ||
analysis_interval = 100 | ||
analysis_callback = AnalysisCallback(semi, interval=analysis_interval) | ||
callbacks = CallbackSet(summary_callback, alive_callback, analysis_callback) | ||
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############################################################################### | ||
# run the simulation | ||
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time_int_tol = 1e-8 | ||
sol = solve(ode, RDPK3SpFSAL49(); abstol=time_int_tol, reltol=time_int_tol, dt = 1e-5, | ||
ode_default_options()..., callback=callbacks) | ||
summary_callback() # print the timer summary | ||
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