divergence detected in AMG solver
i am calculating turbulent viscosity which includes damping function using UDF. when i hook this udf and when iterating it gives "deivergence detected in AMG solver in x momentum. how can i solve my problem plz somebody help me

I have same problem but after 3 second the divergence in AMG solver happens. please help me(I reduced URF of my UDF but it didnt worked.

Check your mesh which is allway the cause

Quote:
and as a another point, if you're using an explicit transient solver you need to ensure that c= (velocity*delta t)/delta x is less than or equal to 1 for stability, definitely affect convergence. and this should help troubleshoot your model: http://www.cfdonline.com/Wiki/Ansys..._inaccurate.3F Nick 
Quote:
and as a another point, if you're using an explicit transient solver you need to ensure that c= (velocity*delta t)/delta x is less than or equal to 1 for stability, definitely affect convergence. and this should help troubleshoot your model: http://www.cfdonline.com/Wiki/Ansys..._inaccurate.3F Nick 
during using solver at start reduce the under relaxation factor . it will solve your problem of divergence ..

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