Particles Getting "Stuck" with new solidParticle Class

eric.m.tridas · July 6, 2014, 17:48

Hey Foamers,

I have implemented particle tracking into a solver with a custom class inherited from the solidParticle class that includes electrostatic body forces from an external field and mutual repulsion between other particles. The solver works fine for large particles (with respect to the mesh cell size) but when I simulate particles that are less than the size of the mesh who start completely inside one cell they seem to get "stuck" in that cell. They will just kind of bounce around within the cell with obtaining unrealistic velocity values. The developers even mention that particles getting stuck in cells had been an issue in the past (see http://www.openfoam.org/version2.0.0/lagrangian.php).

Has anyone else had this problem?

Thanks in advance for the help!

-Eric

eric.m.tridas · July 7, 2014, 15:14

I found a solution to my problem and thought I'd post it here. The issue turned out the be some sort of numerical problem due to the fact that I had set my dt too high. When I lowered the timestetp significantly the particles behaved as they should.

July 6, 2014, 17:48	Particles Getting "Stuck" with new solidParticle Class	#1
eric.m.tridas Member Eric M. Tridas Join Date: May 2011 Location: Tampa, Florida Posts: 48 Rep Power: 14	Hey Foamers, I have implemented particle tracking into a solver with a custom class inherited from the solidParticle class that includes electrostatic body forces from an external field and mutual repulsion between other particles. The solver works fine for large particles (with respect to the mesh cell size) but when I simulate particles that are less than the size of the mesh who start completely inside one cell they seem to get "stuck" in that cell. They will just kind of bounce around within the cell with obtaining unrealistic velocity values. The developers even mention that particles getting stuck in cells had been an issue in the past (see http://www.openfoam.org/version2.0.0/lagrangian.php). Has anyone else had this problem? Thanks in advance for the help! -Eric

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to determine the number of particles injected.	welch	FLUENT	2	January 18, 2024 04:08
Dispersion model for solidParticle Library	ahcai007	OpenFOAM Running, Solving & CFD	2	April 25, 2017 19:12
trying to simulate two-phase jet flow with particles in surface injection	ajkratos	FLUENT	5	March 3, 2015 21:33
solidParticle class. Wrong code	shchepan	OpenFOAM	2	May 27, 2011 02:23
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug	unoder	OpenFOAM Installation	11	January 30, 2008 20:30

July 7, 2014, 15:14		#2
eric.m.tridas Member Eric M. Tridas Join Date: May 2011 Location: Tampa, Florida Posts: 48 Rep Power: 14	I found a solution to my problem and thought I'd post it here. The issue turned out the be some sort of numerical problem due to the fact that I had set my dt too high. When I lowered the timestetp significantly the particles behaved as they should.