I am currently involved in a Direct Chill Casting Model of an Aluminum Alloy. The model was built both in ANSYS FLUENT and in COMSOL. I am facing convergence issues and i cannot find the reason no matter how many changes i implemented. Did anyone find the right value of mush parameter for aluminum or anyother metal alloy ? I thought that this constant is arbitrary and can cause convergence issues. Manual of COMSOL and ANSYS refers that the normal values of Amush are in the range of 10^4 to 10^7, but it is still not converging!

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