residual of volume-fraction increases

September 29, 2006, 09:14

Hello, I'm running a unsteady 2D multiphase (granular flow) problem with the eulerian model. I've ste the underrelaxation coefficient for the volume fraction up to 1 to solve a problem with the continuity residual. But now my residual for volume fraction increases in every time step. The step size is 1e-4s. That is the lowest I can handle with, because of the calculation-time. So far, does anybody has an idea what the problem could be??

thank you

twcp0104 · June 7, 2012, 18:57

Did you ever figure out the problem? Im having the same problem and thought you might have figured it out.

September 29, 2006, 09:14	residual of volume-fraction increases	#1
draussen Guest Posts: n/a	Hello, I'm running a unsteady 2D multiphase (granular flow) problem with the eulerian model. I've ste the underrelaxation coefficient for the volume fraction up to 1 to solve a problem with the continuity residual. But now my residual for volume fraction increases in every time step. The step size is 1e-4s. That is the lowest I can handle with, because of the calculation-time. So far, does anybody has an idea what the problem could be?? thank you

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June 7, 2012, 18:57		#2
twcp0104 Member Howard Join Date: Jun 2012 Posts: 43 Rep Power: 13	Did you ever figure out the problem? Im having the same problem and thought you might have figured it out.