[ivanyao]

hi，
i am doing a simulation,why the courant number get smaller as the time go?does anyone meet the problem ever?

[tian]

hi,

which kind of solver do you used for your case?

Bye
Tian

[antonio_ing]

sometimes it can happen, basically because the solution is converging and the shear is becoming smaller than at the beginning... Usually it could be a good thing

[ivanyao]

now it is ok!
thank you!

[ivanyao]

is there someone good at write new BC?I AM in trouble in it.could someone give me a hand.

[sxhdhi]

Hi, FOAMers,

I am learning OpenFOAM. Could anyone be kind to tell me what the definition of deltaCoeffs is appearing in the below codes? where is the length scale in the formula?

Thanks

Su Xiaohui

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

scalar CoNum = 0.0;
scalar meanCoNum = 0.0;

if (mesh.nInternalFaces())
{
surfaceScalarField SfUfbyDelta =
mesh.surfaceInterpolation::deltaCoeffs()*mag(phi)/fvc::interpolate(rho);

CoNum = max(SfUfbyDelta/mesh.magSf())
.value()*runTime.deltaT().value();

meanCoNum = (sum(SfUfbyDelta)/sum(mesh.magSf()))
.value()*runTime.deltaT().value();
}

Info<< "Courant Number mean: " << meanCoNum
<< " max: " << CoNum << endl;

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