fvSchemes
Hi foamers!!
I would change the ddtSchemes to be timedependent and not steadyState, because I want the program to continue calculating until I choose. Anyone knows what I have to write in ddtSchemes?? thanks!! FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSchemes; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default steadyState; } gradSchemes { default Gauss linear; } divSchemes { default none; div(phi,U) Gauss upwind; div(phi,T) Gauss upwind; div(phi,k) Gauss upwind; div(phi,epsilon) Gauss upwind; div((nuEff*dev(T(grad(U))))) Gauss linear; } laplacianSchemes { default none; laplacian(nuEff,U) Gauss linear corrected; laplacian((1A(U)),p_rgh) Gauss linear corrected; laplacian(kappaEff,T) Gauss linear corrected; laplacian(DkEff,k) Gauss linear corrected; laplacian(DepsilonEff,epsilon) Gauss linear corrected; laplacian(DREff,R) Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } fluxRequired { default no; p_rgh ; } // ************************************************** *********************** // 

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Which solver are you using, and what do you mean by 'stop' (i.e. crashes, or exits without errors)?
See also http://www.cfdonline.com/Forums/ope...gethelp.html. 
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I use the buoyantboussinesqsimplefoam, and I change the geometry and the parameters of transportproperties because I have a laminar flux. I study the difusivity in a cylinder. The program stops because it's converged (SIMPLE solution converged in 139.5 iterations) but I want to continue calculating until 1000 iterations for example. If it's converged, can't I continue calculating?? 
The solver you are using is inherently steady state, so there is no point continuing the simulation after it has converged  even if you would run it for 1000 more iterations, the solution will not change any more. Use buoyantBoussinesqPimpleFoam for a transient simulation.

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ok thanks! I'm going to use this other solver 
If you want longer iteration for convergence you can simply increase the convergence criteria in fvSolution

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