Issue with vortices in Multiphase Simulation examples/107_wasm

[weixiao560]

Hello, Dr. Karnakov!

I created many additional solid cylinders in examples/107_wasm and assigned them as walls. When gravity is 0, it works fine.

But when I assign gravity (especially large gravity), vortices will appear in the gaps between the solids. Can this vortex be reduced or removed? Or stop the vortex from affecting the fluid? I only want to study the interaction between the fluid and the solid, without considering the air. Applying periodic boundary conditions can alleviate this problem, but it cannot fundamentally solve it.

[pkarnakov]

how did you "assign them as walls"? if no-slip or free-slip conditions are specifies on the edges, there should be no flow, like in this hydrostatic test.

[weixiao560]

I've designated the cylinders as walls and added boundary conditions in the code, so they don't move during the simulation. However, once I add a fluid to the model, its motion is affected by vorticity. When gravity is zero, the fluid behaves normally.

However, when gravity is increased, the fluid's motion is affected by vorticity, causing the fluid to rotate locally. Can I cancel this effect of vorticity on the fluid?

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At a certain point in the simulation, the fluid stops moving, and the entire model is filled with vorticity. I'm unsure why this happens, and are there any solutions?