CFLStep.cpp

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#include <cstdio>
#include <cstdlib>
 
#include <LibUtilities/BasicUtils/SessionReader.h>
#include <SolverUtils/Driver.h>
 
#include <IncNavierStokesSolver/EquationSystems/IncNavierStokes.h>
 
using namespace std;
using namespace Nektar;
using namespace Nektar::SolverUtils;
 
int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        fprintf(stderr, "Usage: ./CflStep file.xml \n");
        fprintf(stderr, "\t Method will read intiial conditions section of "
                        ".xml file for input \n");
        exit(1);
    }
 
    LibUtilities::SessionReaderSharedPtr session;
    SpatialDomains::MeshGraphSharedPtr graph;
 
    string vDriverModule;
    DriverSharedPtr drv;
    try
    {
        // Create session reader.
        session = LibUtilities::SessionReader::CreateInstance(argc, argv);
 
        // Create MeshGraph.
        graph = SpatialDomains::MeshGraph::Read(session);
 
        // Create driver
        session->LoadSolverInfo("Driver", vDriverModule, "Standard");
        drv = GetDriverFactory().CreateInstance(vDriverModule, session, graph);
 
        EquationSystemSharedPtr EqSys   = drv->GetEqu()[0];
        IncNavierStokesSharedPtr IncNav = EqSys->as<IncNavierStokes>();
 
        IncNav->SetInitialConditions(0.0, false);
        Array<OneD, NekDouble> cfl = IncNav->GetElmtCFLVals();
 
        // Reset Pressure field with CFL values
        Array<OneD, MultiRegions::ExpListSharedPtr> fields =
            IncNav->UpdateFields();
        int i, n, nquad, cnt;
        int nfields = fields.size();
        int nexp    = fields[0]->GetExpSize();
 
        int elmtid = Vmath::Imax(nexp, cfl, 1);
 
        cout << "Max CFL: " << cfl[elmtid] << " In element " << elmtid << endl;
 
        for (n = 0; n < nfields; ++n)
        {
            if (session->GetVariable(n) == "p")
            {
                break;
            }
        }
 
        ASSERTL0(n != nfields, "Could not find field named p in m_fields");
 
        Array<OneD, NekDouble> phys = fields[n]->UpdatePhys();
 
        cnt = 0;
        for (i = 0; i < fields[n]->GetExpSize(); ++i)
        {
            nquad = fields[n]->GetExp(i)->GetTotPoints();
            Vmath::Fill(nquad, cfl[i], &phys[cnt], 1);
            cnt += nquad;
        }
 
        fields[n]->FwdTransLocalElmt(fields[n]->GetPhys(),
                                     fields[n]->UpdateCoeffs());
 
        // Need to reset varibale name for output
        session->SetVariable(n, "CFL");
 
        // Reset session name for output file
        std::string outname = IncNav->GetSessionName();
 
        outname += "_CFLStep";
        IncNav->ResetSessionName(outname);
        IncNav->Output();
    }
    catch (const std::runtime_error &)
    {
        return 1;
    }
    catch (const std::string &eStr)
    {
        cout << "Error: " << eStr << endl;
    }
 
    return 0;
}