relation between residuals and imbalances

prabhu

Hi Glenn and Robin,

I am simulating overexpanded flow through a bell nozzle. I get massive flow separation. I am using transient run with SST model for turbulence.

I am using adaptive timestepping. When i had set target RMS residual as 5e-5, the MAX residual was >1e-3. The p-mass imbalance was plus-minus 0.05% and H-energy imbalance was plus-minus 1%. Since the MAX residual was >1e-3, I set target MAX residual as 1e-3. Now the timestep reduced. But p-mass imbalance became plus-minus 1% and H-energy imbalance became plus-minus 2%.

I had expected the imbalances to reduce with the decrease in MAX residual!?

thanking you,