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Old   May 7, 2007, 00:26
Default convergence
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Dear guys,

I am running a STEADY STATE problem of conjugate heat transfer with heat source in solid region.

It is a problem of 11 lack cells.after 3000 iterations, mass residual is fluctuating about 4.3e-3(very less fluctuation) all velocity residuals of the order of 3.0e-6. Enthalpy residual for solid fluctuating about 2.6e2. all settings by default(SIMPLE ALGO)all underrelaxation parameters by default. How to further reduce the residuals. any suggestions urgently needed...

thanksin advance

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Old   May 7, 2007, 01:33
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Mac
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have you under-relaxed for solid as well ??
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Old   May 7, 2007, 01:38
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NO

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Old   May 7, 2007, 01:39
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NO nO underrealxed

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Old   May 8, 2007, 05:16
Default Re: convergence
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try to use an under-relaxation factor of 0.999 for solids. U set this parameter in the thermal option panel. if it doesn't work U have to perform a transient analisys.
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