# Courant number

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 December 26, 2008, 02:42 hi， i am doing a simulation #1 Senior Member   weihong yao Join Date: Mar 2009 Posts: 117 Rep Power: 10 hi， i am doing a simulation,why the courant number get smaller as the time go?does anyone meet the problem ever?

 December 26, 2008, 05:28 hi, which kind of solver do #2 Senior Member     Tian Join Date: Mar 2009 Location: Berlin, germany Posts: 111 Rep Power: 10 hi, which kind of solver do you used for your case? Bye Tian __________________ BIM HVACTool, The Green Building Simulation Tool for OpenFOAM, Energy Plus and Radiance.

 December 29, 2008, 16:27 sometimes it can happen, basic #3 Member   antonio segalini Join Date: Mar 2009 Posts: 75 Rep Power: 10 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

 December 30, 2008, 05:03 now it is ok! thank you! #4 Senior Member   weihong yao Join Date: Mar 2009 Posts: 117 Rep Power: 10 now it is ok! thank you!

 December 30, 2008, 05:15 is there someone good at write #5 Senior Member   weihong yao Join Date: Mar 2009 Posts: 117 Rep Power: 10 is there someone good at write new BC?I AM in trouble in it.could someone give me a hand.

 January 5, 2009, 05:25 Hi, FOAMers, I am learning #6 Member   Su Xiaohui Join Date: Mar 2009 Location: Singapore Posts: 30 Rep Power: 10 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; // ************************************************** *********************** //

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