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Aliasing.cpp File Reference
#include <cstdio>
#include <cstdlib>
#include <SolverUtils/Driver.h>
#include <LibUtilities/BasicUtils/SessionReader.h>
#include <IncNavierStokesSolver/EquationSystems/IncNavierStokes.h>
#include <IncNavierStokesSolver/AdvectionTerms/NavierStokesAdvection.h>
Include dependency graph for Aliasing.cpp:

Go to the source code of this file.

Functions

int main (int argc, char *argv[])

Function Documentation

int main ( int  argc,
char *  argv[] 
)

Definition at line 13 of file Aliasing.cpp.

References Nektar::LibUtilities::SessionReader::CreateInstance(), Nektar::LibUtilities::NekFactory< tKey, tBase, >::CreateInstance(), Nektar::SolverUtils::GetDriverFactory(), Nektar::SolverUtils::EquationSystem::SetInitialConditions(), and Vmath::Vsub().

{
if(argc != 2)
{
fprintf(stderr,"Usage: ./Aliasing file.xml \n");
fprintf(stderr,"\t Method will read intiial conditions section of .xml file for input \n");
exit(1);
}
string vDriverModule;
try
{
// Create session reader.
session = LibUtilities::SessionReader::CreateInstance(argc, argv);
// Create driver
session->LoadSolverInfo("Driver", vDriverModule, "Standard");
drv = GetDriverFactory().CreateInstance(vDriverModule, session);
EquationSystemSharedPtr EqSys = drv->GetEqu()[0];
IncNav->SetInitialConditions(0.0,false);
Array<OneD, MultiRegions::ExpListSharedPtr> fields = IncNav->UpdateFields();
int i;
int nConvectiveFields = IncNav->GetNConvectiveFields();
int nphys = fields[0]->GetTotPoints();
Array<OneD, Array<OneD, NekDouble> > VelFields(nConvectiveFields);
Array<OneD, Array<OneD, NekDouble> > NonLinear(nConvectiveFields);
Array<OneD, Array<OneD, NekDouble> > NonLinearDealiased(nConvectiveFields);
for(i = 0; i < nConvectiveFields; ++i)
{
VelFields[i] = fields[i]->UpdatePhys();
NonLinear[i] = Array<OneD, NekDouble> (nphys);
NonLinearDealiased[i] = Array<OneD, NekDouble> (nphys);
}
boost::shared_ptr<NavierStokesAdvection> A
= boost::dynamic_pointer_cast<NavierStokesAdvection>(IncNav->GetAdvObject());
if (!A)
{
cout << "Must use non-linear Navier-Stokes advection" << endl;
exit(-1);
}
// calculate non-linear terms without dealiasing
A->SetSpecHPDealiasing(false);
A->Advect(nConvectiveFields, fields,
VelFields, VelFields,
NonLinear, 0.0);
// calculate non-linear terms with dealiasing
A->SetSpecHPDealiasing(true);
A->Advect(nConvectiveFields, fields,
VelFields, VelFields,
NonLinearDealiased, 0.0);
// Evaulate Difference and put into fields;
for(i = 0; i < nConvectiveFields; ++i)
{
Vmath::Vsub(nphys,NonLinearDealiased[i],1,NonLinear[i],1,NonLinear[i],1);
fields[i]->FwdTrans_IterPerExp(NonLinear[i],fields[i]->UpdateCoeffs());
// Need to reset varibale name for output
string name = "NL_Aliasing_"+session->GetVariable(i);
session->SetVariable(i,name.c_str());
}
// Reset session name for output file
std::string outname = IncNav->GetSessionName();
outname += "_NonLinear_Aliasing";
IncNav->ResetSessionName(outname);
IncNav->Output();
}
catch (const std::runtime_error&)
{
return 1;
}
catch (const std::string& eStr)
{
cout << "Error: " << eStr << endl;
}
return 0;
}