# simulation whitout a U equation

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 June 26, 2009, 03:52 simulation whitout a U equation #1 Member   Sven Degner Join Date: Mar 2009 Location: Zürich Posts: 54 Rep Power: 8 hi, i write my own DES model and try next to simulate the correlation of the isotropic turbulence. But in this case I got some problems with the initial conditions. At the moment I got the velocity conditions, the problem is how it is possible to write the other fields for my fixed velocity field , in my case p,k,epsilon? the simple idea, solve the case without U equation till convergence and i got the matching field for my velocity field? original oodles something like this : fvVectorMatrix UEqn //the velocity equation ( fvm::ddt(U) + fvm::div(phi, U) + sgsModel->divDevBeff(U) ); if (momentumPredictor) { solve(UEqn == -fvc::grad(p)); } // --- PISO loop for (int corr=0; corr

 August 20, 2009, 05:48 #2 Member   Markus Weinmann Join Date: Mar 2009 Location: Stuttgart, Germany Posts: 77 Rep Power: 8 Hi Sven have you solved your problem already? In order not to solve for U, you could try to increase the tolerance on U such that U is never updated in the iteration process. I am also interesseted in how you have generated isotropic turbulence in OF? The reason why I am asking is because I want to calibrate a hybrid RANS/LES method using isotropic turbulence. Unfortunately, I was not very successful in generating isotropic turbulence until now. Do you have any tips? Markus

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