Hello! New user here,

I am trying to model converging-diverging rocket nozzles, but no matter what I’ve done the simulation only runs for one time step and gives the error “Maximum number of iterations exceeded when calculating temperature from a thermodynamic potential.” So far I’ve tried:

-smoothing out corners in the geometry (I’m not modeling a specific nozzle, just a test piece)

-modeling half the nozzle with symmetry

-decreasing delta t to .01 sec and .001 sec (still running for 1000 steps though)

-increasing maximum run time

-inflating the boundary layer

-refining the symmetry surface (it had some meshing artifacts)

-refining the throat region

-increasing the pressure/velocity absolute tolerances

A pair of expert eyes on this would be a great help.

Project link:

https://www.simscale.com/projects/nbabusis/smooth_bell_nozzle_test/