# Convergence in a conjugate heat transfer problem

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 June 2, 2006, 08:40 Convergence in a conjugate heat transfer problem #1 dp Guest   Posts: n/a Hello guys, I am solving a conjugate heat transfer flow problem with heat generation. I am getting good convergence of Fluid parameters WITH little tunig of underrelaxation parameters.But for solid MATERIAL enthalpy residuals are not converging. HOW TO GO FOR IT.also how to set convergence criteria for solid seperately. Thanks in advance.

 June 5, 2006, 03:53 Re: Convergence in a conjugate heat transfer probl #2 DenizeN Guest   Posts: n/a Try duble precision.

 June 5, 2006, 10:08 Re: Convergence in a conjugate heat transfer probl #3 katghir Guest   Posts: n/a use PISO algorithm. using steady state sol not converged means try to use transient (Pseudo transient).

 June 6, 2006, 00:11 Re: Convergence in a conjugate heat transfer probl #4 dp Guest   Posts: n/a Thanks a lot. let me try.

 June 6, 2006, 06:40 Re: Convergence in a conjugate heat transfer probl #5 Stephen Guest   Posts: n/a The problem is that the thermal response times of your solid and fluid are probably very different. If your problem is not bouyancy dependedent, you could try switching of the enthalpy solver and solving just the flow field - once this has converged, do the opposite, switch off solution of everything apart from enthalpy and continue the calculation.

 June 8, 2006, 10:31 Re: Convergence in a conjugate heat transfer probl #6 moritz Guest   Posts: n/a I had the same problem, and I get the best convergence with a "solid cell temperature under-relaxation factor" of 0.999 ("thermal options" panel or conj,on,0.999), with 1 it doesn't converge and with 0.9 very slowly. Please let me know if this helps. In the StarCD user guide it is recommended to leave just one under-relaxation factor below 1. So try to set the fluid under-relaxation factor to 1.

 June 9, 2006, 00:53 Re: Convergence in a conjugate heat transfer probl #7 dp Guest   Posts: n/a Thanks for the suggestions.Let me try and see. I will let u know whether it works.

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