[ywem]

Hi, I compared the results from OpenFOAM with the analytical ones for the equation

in an spherical symmetry space using 2D model like this


These are the solver codes,
#include "fvCFD.H"
#include "simpleControl.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
int main(int argc, char *argv[])
{
#include "setRootCase.H"
#include "createTime.H"
#include "createMesh.H"
#include "createFields.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Info<< "\nStarting iteration loop\n" << endl;

simpleControl simple(mesh);
while (runTime.loop())
{
Info<< "Iteration = " << runTime.timeName() << nl << endl;
while (simple.correctNonOrthogonal())
{

solve
(
fvm::ddt(na)- Dab*(fvm::laplacian(na))
);
}
runTime.write();
Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
<< " ClockTime = " << runTime.elapsedClockTime() << " s"
<< nl << endl;
}
Info<< "End\n" << endl;
return 0;
}


However, the results are much larger than the analytical ones. I have tried to refine the mesh and put the outer surface much far away, but they did not make sense. I do not know why.