Staggered, lam, 2D, with 2 uds. After several iterations, a error message comes out as follow, "divergence detected in AMG solver: uds-1"

What can I do for this problem?

When I try to use coupled method, I will never meet this condition.

cheers,

hi, i think there might be some problem with your first UDF,Just use the first UDF in isolation without using the other one in segregated solver.Divergence errors are generally observed when a quantity is being divided by zero.These errors i have experienced hence i think might be the case.Just check your udf ,if at the time of running your code somevalue becomes 0 and is it dividing something,then that might be the problem maybe u can write the entire data in a file and check them.Hope it helps

regards

My diffusivity and property are temperature dependent, so I need to do the iteration with coupled method?

hi I meant to say that if u have got to use both the udf together then it would be better to write the output in a file and check if any quantity in your first udf is being divided by zero by checking the files.

regards

Dear sir,

Thank you very much!! I'm tryin' to do that

Regards,