Dear Karthik,nnOkay. I computed the volume fraction of tracer before starting the simulation. I thought that, since each simulation adds the same amount of tracer, the volume fraction of tracer at the beginning should be the same, and not be impacted by RPM. But I can look at the XZ plane of the simulation to see if there is unusual flow at the injection point of the tracer.Thank you for your time.Sincerely,nnRyan Doylen