[Vijay_01]

Hello! This is my first thread in CFD Online. I'm working on the design of a pressure-fed LO2 and LNG rocket engine. I've been using Fluent to estimate the heat flux for an ablative-cooled engine. I was able to solve all the compilation errors for my UDF.

I'm attaching my boundary conditions and mesh. My model is axisymmetric and I have a fluid-solid domain in my problem, so all my methods are second order. But I keep getting this error whenever I run my calculations.

"Divergence detected in AMG solver. temporarily reducing Courant number to 0.5 and trying again..."

Is there a problem with my mesh? I've used a multi-zone and face mesh with 15 inflation layers.

I've tried all the methods I know to simplify the problem. I still keep getting*the*same*error.