javat33489
Subscriber

Thanks for the answer, I understand you. But it didn't help me. I tried to increase the amount over 150 and it again caused the particles to fly apart. MSL did not help me.

Let me tell you everything again and in order. The drill is a rigid body, on it is a deformable body nozzle, they are fastened TIED_SURFACE_TO_SURFACE.

1.First I used calculation time 0.0001 sec, mass scale - off, MLS - off. The drill successfully passes concrete particles.

2.I used calculation time 1 sec, mass scale - off, MLS - off. The resolution in this case takes 937 hours. I followed your advice and made TSSCF=5 (and more). Now negative volume errors appeared and the calculation did not lead to anything.

3.Then I made the calculation time 1 sec, mass scale - on (1-e5), MLS - off. I had to increase the endmass value to 1+09 in CONTROL_TERMINATION. The solution time was significantly reduced, up to 30 minutes. But upon contact with the drill, the particles fly apart.

4.Then I did so. Calculation time 1 sec, mass scale - on (1-e5), MLS - on, number neigbors =300. The particles also fly apart.

____

I will explain why I want to make the calculation time 1 second. Now I'm making a test model when the drill cuts off part of the concrete. In the future, I want to make a concrete drilling model, where deformable nozzles - teeth will be installed on the drill. So, with a calculation time of 0.0001 sec and one edge of the drill, the teeth are strongly deformed without even touching the particles and their stresses are more than 25000 MPa. Because the speed, for example, 26 rad / s is a lot at a time of 0.0001 s, these are cosmic loads for nozzles.

In this cutting task, I wanted to achieve stable operation at 1 sec. And in the drilling task, where the rotation speed of the drill is set, I wanted the rotation and time loads to be set proportionally correctly, I think that this requires a calculation time of 1 second, at which I can set the real rotation speed.

If I'm wrong, correct me and tell me how to do it right?