Particle pairs are overlapping in MPM model(macroscopic particle model)-ANSYS Fluent?
 

Hi everyone,
I am modelling the blockage of Particle in an air-filled pipe using Macroscopic particle model MPM. By means of particle-based numerical simulations of gravity-driven flows in vertical pipes and test the material transport by adding a helical texture to the inner-wall of the pipe, however, in the first case without helix structure, the blockage has been achieved due to the collision, but some of particle pairs tend to overlap, and I reserved Warning: 1 particle pairs are overlapping!
In the second case, by adding the helix, the most of my particle are lost out of the domain in short time after running the simulation. Please check the images to get a better image of the problem.
I tried to reduce the coefficient of restitution , in order to induce the loss energy for MPM particle once it hits the wall, and I set a high value for minimum drag force for particle detachment( please correct me if its wrong), but it does not work.
Any help would be greatly appreciated.

Hello Abeer,

Have you solved a problem with "particle pairs are overlapping!"? I also use the MPM technique and face a problem like yours. I've tried to fix it by changing COR to higher 0.8 or lower 0.8, but the overlapping of particles still occurred.

Your help is greatly appreciated.

Best Regards,
Mapel