[prometheus69]

I am running a steady-state port flow simulation and trying to calculate net moment on a plane with its normal aligned with the cylinder axis some 20 mm below the combustion chamber plane.

I use the K-omega model and all wall y+ treatment. I apply a pressure difference between the inlet plenum and outlet (the bottom face of the cylinder) and run the simulation. I have achieved a wall y+ mostly between 0-20 everywhere. In some regions, it goes till ~85. Mesh size is 1mm on the chamber and 3mm everywhere else. I use polyhedral mesh and 10 mm prism layer with a growth rate of 1.2.

The net moment on the plane does not converge at all. How do I go on about this? How should I change my mesh or any tips on this?