Hallo everybody.
I have a question about the rotation of cohesive particles when using CFDEM coupling. The particles start to rotate when they overlap with another particle or a wall. If I'm not using CFDEM coupling (only DEM), they don't rotate (see rotate.png). I don't use any rolling friction model. Can someone explain me this behaviour?
many thanks in advance.
Johannes
| Attachment | Size |
|---|---|
 rotation.tar_.gz | 1.4 MB |
 rotate.png | 138.79 KB |
Ermek Asylbekov | Tue, 03/27/2018 - 11:07
Full Example
Hi Johannes,
It's hard to answer this question without having your code. Can you upload your case? Or else its really hard to tell. It could have 1000 reasons.
Regards,
Ermek
j-kerbl | Tue, 03/27/2018 - 15:01
Hi Johannes,
Hi Johannes,
as Ermek pointed out, hard to say without your code. Since I don't have your micromMgS unit system I can't run the case directly.
However, a small amount of rolling friction often has a stabilizing effect. Of course with CFDEM you introduce new forces on the particles, which in combination with the walls might cause the particles to spin, which is not dampened.
You could try adding a small amount of rolling-friction, e.g. 0.01
Cheers,
Josef