Abaqus CFD Issue

[xuxxx679]

Hi,

Has anyone here used Abaqus CFD to run steady state before? I found that the results will vary with the iteration number you gave. Did anyone run into the same problem before?

Thanks,
Danny

 

[Dave442]

Is that not expected?

Each iteration the solver produces new values for the field output. Assuming your analysis converges nicely, more iterations should result in lower residual error and a more accurate solution. See the link below for examples of what expected convergence for steady/unsteady CFD analyses looks like:

http://www.symscape.com/steady-state-or-unsteady-cfd-simulation

You should verify that your analysis has converged to an acceptable tolerance. If your results are changing a lot when you change the number of iterations then you analysis has not converged or may have problems. For a steady-state analysis, the residual values for the velocity components are output to the .sta file.