[mary24]

Hi all,

I am simulating a case with compressible flow. I am also using udf for scalar transport equation.

I have run iterations beforehand, with the uds-0 equation off, to get a converged solution before enabling the uds-0. Once the solution is converged by checking the mass flux and heat flux imbalances, I turned on the calculations of uds-0 in the same case file.

The output text in the console immediately printed out "Divergence detected in AMG solver: uds-0". I have reduced the under-relaxation factor for the uds-0 to 0.1, and still the error persists. I also tried changing it to coupled solver and playing around with the multigrid solver, but the error is still there.

My mesh is not the best but is having > 0.1 as the minimum orthogonal quality. I am stuck in this problem for quite some time now. Any suggestions are welcome.

Thanks.