Learning Forum

[javat33489]

Hello everyone, I am simulating the movement of a ball under water flow.
The liquid with the speed of 7 l/s moves the ball towards the saddle (from right to left), gravity is also indicated from right to left (in fact, the pipe is vertical).

I am using 6DOF and remeshing.
But during the solution I get the error negative volume mesh:

I reduced the substeps and remeshing interval but it did not help:

I also strongly crushed the grid:

but it did not help either.
I am using k-epsilon.

Tell me what else can be done?

[948185722]

Try restricting the movement of the ball perpendicular to the pipeline

[javat33489]

I will try sir, please tell me how to do it?

[Federico]

When you define your 6DOF properties, you can select Translational 1DOF. You then need to define the direction of motion (whatever the horizontal direction is in your screenshots)

[Federico]

Refining the mesh will further constrain your allowable time step size.

Can you show the mesh after the negative volume mesh error?

Also, I would suggest using the Unified Remeshing method instead of Methods Based, which requires more tuning.

[javat33489]

>>Also, I would suggest using the Unified Remeshing method instead of Methods Based, which requires more tuning.

I tried sir, it didn't help.

[Federico]

Can you show the mesh after the negative volume mesh error?