residual of volume-fraction increases

September 29, 2006, 10:14

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, 19:57

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

September 29, 2006, 10:14	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Extrusion with OpenFoam problem No. Iterations 0	Lord Kelvin	OpenFOAM Running, Solving & CFD	8	March 28, 2016 12:08
Orifice Plate with a fully developed flow - Problems with convergence	jonmec	OpenFOAM Running, Solving & CFD	3	July 28, 2011 06:24
On the damBreak4phaseFine cases	paean	OpenFOAM Running, Solving & CFD	0	November 14, 2008 22:14
Differences between serial and parallel runs	carsten	OpenFOAM Bugs	11	September 12, 2008 12:16
Unknown error	sivakumar	OpenFOAM Pre-Processing	9	September 9, 2008 13:53

June 7, 2012, 19:57		#2
twcp0104 Member Howard Join Date: Jun 2012 Posts: 43 Rep Power: 14	Did you ever figure out the problem? Im having the same problem and thought you might have figured it out.