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Divergence in non-Newtonian fluid UDF

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Old   June 24, 2016, 07:48
Default Divergence in non-Newtonian fluid UDF
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mohsen
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Hi every body

I have written an UDF for define the viscosity for non-Newtonian fluid (Herschel-Baulkley). During run the project in steady state mode and after about 400 iteration divergence is accrued. what is your idea about that and what should i do?
how could reach convergence?

residual plot is attached.

Best Regards
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