138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
// Copyright (c) 2010-2020, Lawrence Livermore National Security, LLC. Produced
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// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
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// LICENSE and NOTICE for details. LLNL-CODE-806117.
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//
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// This file is part of the MFEM library. For more information and source code
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// availability visit https://mfem.org.
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//
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// MFEM is free software; you can redistribute it and/or modify it under the
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// terms of the BSD-3 license. We welcome feedback and contributions, see file
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// CONTRIBUTING.md for details.
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// 3d flow over a cylinder benchmark example
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#include "navier_solver.hpp"
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#include <fstream>
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using namespace mfem;
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using namespace navier;
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struct s_NavierContext
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{
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int order = 4;
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double kin_vis = 0.001;
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double t_final = 8.0;
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double dt = 1e-3;
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} ctx;
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void vel(const Vector &x, double t, Vector &u)
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{
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double xi = x(0);
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double yi = x(1);
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double zi = x(2);
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double U = 2.25;
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if (xi <= 1e-8)
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{
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u(0) = 16.0 * U * yi * zi * sin(M_PI * t / 8.0) * (0.41 - yi)
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* (0.41 - zi) / pow(0.41, 4.0);
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}
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else
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{
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u(0) = 0.0;
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}
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u(1) = 0.0;
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u(2) = 0.0;
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}
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int main(int argc, char *argv[])
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{
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MPI_Session mpi(argc, argv);
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int serial_refinements = 0;
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Mesh *mesh = new Mesh("box-cylinder.mesh");
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for (int i = 0; i < serial_refinements; ++i)
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{
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mesh->UniformRefinement();
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}
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if (mpi.Root())
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{
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std::cout << "Number of elements: " << mesh->GetNE() << std::endl;
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}
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auto *pmesh = new ParMesh(MPI_COMM_WORLD, *mesh);
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delete mesh;
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// Create the flow solver.
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NavierSolver flowsolver(pmesh, ctx.order, ctx.kin_vis);
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flowsolver.EnablePA(true);
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// Set the initial condition.
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ParGridFunction *u_ic = flowsolver.GetCurrentVelocity();
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VectorFunctionCoefficient u_excoeff(pmesh->Dimension(), vel);
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u_ic->ProjectCoefficient(u_excoeff);
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// Add Dirichlet boundary conditions to velocity space restricted to
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// selected attributes on the mesh.
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Array<int> attr(pmesh->bdr_attributes.Max());
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// Inlet is attribute 1.
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attr[0] = 1;
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// Walls is attribute 3.
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attr[2] = 1;
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flowsolver.AddVelDirichletBC(vel, attr);
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double t = 0.0;
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double dt = ctx.dt;
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double t_final = ctx.t_final;
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bool last_step = false;
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flowsolver.Setup(dt);
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ParGridFunction *u_gf = flowsolver.GetCurrentVelocity();
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ParGridFunction *p_gf = flowsolver.GetCurrentPressure();
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ParaViewDataCollection pvdc("3dfoc", pmesh);
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pvdc.SetDataFormat(VTKFormat::BINARY32);
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pvdc.SetHighOrderOutput(true);
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pvdc.SetLevelsOfDetail(ctx.order);
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pvdc.SetCycle(0);
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pvdc.SetTime(t);
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pvdc.RegisterField("velocity", u_gf);
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pvdc.RegisterField("pressure", p_gf);
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pvdc.Save();
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for (int step = 0; !last_step; ++step)
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{
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if (t + dt >= t_final - dt / 2)
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{
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last_step = true;
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}
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flowsolver.Step(t, dt, step);
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if (step % 10 == 0)
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{
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pvdc.SetCycle(step);
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pvdc.SetTime(t);
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pvdc.Save();
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}
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if (mpi.Root())
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{
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printf("%11s %11s\n", "Time", "dt");
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printf("%.5E %.5E\n", t, dt);
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fflush(stdout);
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}
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}
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flowsolver.PrintTimingData();
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delete pmesh;
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return 0;
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}
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