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-   -   icoDyMFoam with non-Orthogonality Check (https://www.cfd-online.com/Forums/openfoam-solving/151554-icodymfoam-non-orthogonality-check.html)

fluidmobil April 13, 2015 05:06
icoDyMFoam with non-Orthogonality Check
 
Hello,

I'm using icoDyMFoam for a moving Mesh without topological changes. In order to control the mesh-Quality during the run I want to use checkMesh while running icoDyMFoam.

So is the non-Orthogonality check already done with icoDyMFoam and if so, how can I simlply use it?

I want icoDyMFoam to stop the run if non-Orthogonality exceeds a particular threshold.

thanks for help

fluidmobil April 22, 2015 09:07
some additional info: I am using foam extend 3.1
I tried this so far:

in the solver icoDyMFoam.C I added the lines

Code:
#      include "checkVolContinuity.H"

        if (runTime.timeIndex())
        {
            mesh.checkMesh(true);
        }

Code of icoDyMFoam.C (added lines coloured green):
Code:
/*---------------------------------------------------------------------------*\
  =========                |
  \\      /  F ield        | foam-extend: Open Source CFD
  \\    /  O peration    |
    \\  /    A nd          | For copyright notice see file Copyright
    \\/    M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.

    foam-extend is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation, either version 3 of the License, or (at your
    option) any later version.

    foam-extend is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

Application
    icoDyMFoam

Description
    Transient solver for incompressible, laminar flow of Newtonian fluids
    with dynamic mesh.

Author
    Hrvoje Jasak, Wikki Ltd.  All rights reserved.

\*---------------------------------------------------------------------------*/

#include "fvCFD.H"
#include "dynamicFvMesh.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

int main(int argc, char *argv[])
{
#  include "setRootCase.H"
#  include "createTime.H"
#  include "createDynamicFvMesh.H"
#  include "initContinuityErrs.H"
#  include "initTotalVolume.H"
#  include "createFields.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

    Info<< "\nStarting time loop\n" << endl;

    while (runTime.run())
    {
#      include "readControls.H"
#      include "checkTotalVolume.H"

        // Make the fluxes absolute
        fvc::makeAbsolute(phi, U);

#      include "CourantNo.H"
#      include "setDeltaT.H"

        runTime++;

        Info<< "Time = " << runTime.timeName() << nl << endl;

        bool meshChanged = mesh.update();
        reduce(meshChanged, orOp<bool>());

#      include "volContinuity.H"

        if (correctPhi && (mesh.moving() || meshChanged))
        {
            // Fluxes will be corrected to absolute velocity
            // HJ, 6/Feb/2009
#          include "correctPhi.H"
        }

        // Make the fluxes relative to the mesh motion
        fvc::makeRelative(phi, U);

        if (mesh.moving() && checkMeshCourantNo)
        {
#          include "meshCourantNo.H"
        }

#      include "UEqn.H"

        // --- PISO loop

        for (int corr = 0; corr < nCorr; corr++)
        {
            rAU = 1.0/UEqn.A();

            U = rAU*UEqn.H();
            phi = (fvc::interpolate(U) & mesh.Sf());
              //+ fvc::ddtPhiCorr(rAU, U, phi);

            adjustPhi(phi, U, p);

            for (int nonOrth=0; nonOrth<=nNonOrthCorr; nonOrth++)
            {
                fvScalarMatrix pEqn
                (
                    fvm::laplacian(rAU, p) == fvc::div(phi)
                );

                pEqn.setReference(pRefCell, pRefValue);

                if (corr == nCorr - 1 && nonOrth == nNonOrthCorr)
                {
                    pEqn.solve(mesh.solutionDict().solver(p.name() + "Final"));
                }
                else
                {
                    pEqn.solve(mesh.solutionDict().solver(p.name()));
                }

                if (nonOrth == nNonOrthCorr)
                {
                    phi -= pEqn.flux();
                }
            }

#          include "continuityErrs.H"

            // Make the fluxes relative to the mesh motion
            fvc::makeRelative(phi, U);

            U -= rAU*fvc::grad(p);
            U.correctBoundaryConditions();
        }

#      include "checkVolContinuity.H"

        if (runTime.timeIndex())
        {
            mesh.checkMesh(true);
        }

        runTime.write();
    }

    Info<< "End\n" << endl;

    return(0);
}


// ************************************************************************* //
this works and I get the whole Information about mesh quality.

My question is now what to do if I only need the information about the non-Orthogonality of the mesh? How can I get only the relevant variable?

Any help appreciated
Mathi

fluidmobil April 29, 2015 11:08
Hello,
Ok, now I use the following code to get the wanted information:

Code:
mesh.checkFaceOrthogonality(true)
instead of

if (runTime.timeIndex()) { mesh.checkMesh(true); }
in the function checkFaceOrthogonality() there is a variable used, called "minDDotS"

I want to use this variable in an if condition.

Can anybody tell me how to get this variable in the main function of icoDyMFoam.C?


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