Rheolef  7.2
an efficient C++ finite element environment
oldroyd_contraction.cc

The Oldroyd problem on the contraction benchmark.

The Oldroyd problem on the contraction benchmark

#include "rheolef.h"
using namespace rheolef;
using namespace std;
int main(int argc, char**argv) {
environment rheolef (argc, argv);
cin >> noverbose;
geo omega (argv[1]);
Float We_incr = (argc > 2) ? atof(argv[2]) : 0.1;
Float We_max = (argc > 3) ? atof(argv[3]) : 0.1;
Float delta_t0 = (argc > 4) ? atof(argv[4]) : 0.005;
string restart = (argc > 5) ? argv[5] : "";
pb.tol = 1e-3;
pb.max_iter = 50000;
pb.alpha = 8./9;
pb.a = 1;
pb.delta_t = delta_t0;
Float delta_t_min = 1e-5;
Float We_incr_min = 1e-5;
dout << catchmark("alpha") << pb.alpha << endl
<< catchmark("a") << pb.a << endl;
branch even ("We", "tau", "u", "p");
field tau_h, uh, ph;
pb.initial (omega, tau_h, uh, ph, restart);
dout << even (pb.We, tau_h, uh, ph);
bool ok = true;
do {
if (ok) pb.We += We_incr;
derr << "# We = " << pb.We << " delta_t = " << pb.delta_t << endl;
field tau_h0 = tau_h, uh0 = uh, ph0 = ph;
ok = pb.solve (tau_h, uh, ph);
if (ok) {
dout << even (pb.We, tau_h, uh, ph);
} else {
pb.delta_t /= 2;
tau_h = tau_h0; uh = uh0; ph = ph0;
if (pb.delta_t < delta_t_min) {
derr << "# solve failed: decreases We_incr and retry..." << endl;
pb.delta_t = delta_t0;
We_incr /= 2;
pb.We -= We_incr;
if (We_incr < We_incr_min) break;
} else {
derr << "# solve failed: decreases delta_t and retry..." << endl;
}
}
derr << endl << endl;
} while (true);
}
see the Float page for the full documentation
see the branch page for the full documentation
see the field page for the full documentation
see the geo page for the full documentation
see the catchmark page for the full documentation
Definition: catchmark.h:67
see the environment page for the full documentation
Definition: environment.h:121
This file is part of Rheolef.
STL namespace.
int main(int argc, char **argv)
The Oldroyd problem on the contraction benchmark – boundary conditions.
The Oldroyd problem by the theta-scheme – class header.
rheolef - reference manual
bool solve(field &tau_h, field &uh, field &ph)
void initial(const geo &omega, field &tau_h, field &uh, field &ph, string restart)