Particles spurt out from inlet
Hi,
We are trying to simulate the process that using a liquid/gas to exchange the original liquid/gas in a container.
To simplify this process, we use a closed and intercommunicate box like this. Inlet locate at the top border of left box, outlet in right one.
https://forums.dual.sphysics.org/uploads/419/NWF61VH2ZGCK.png https://forums.dual.sphysics.org/uploads/011/WF02P0M60BS4.png
After a few steps simulate, the situation become like this:
- the first and most important problem is that particles would spurt out from inlet.
- I tried use a fix value for outlet, but that makes a hole around it. Does that mean use the extrapolated value option is better?
The xml file:
Comments
These would be my suggestions;
To isolate the problem before you move on to outlet flow definition,
1- Define the kernel size explicitly and make sure that you have enough boundary layers to provide full kernel support.
2- Make sure that the speed of sound is at least an order of magnitude greater than the characteristic speed.
3- Try changing the shifting correction option.
4- Try it with Symplectic for time stepping.
If you see an improvement after these, keep testing the effect of in/out settings.
Circles is completely correct, this is how one should tackle it. One step at a time and not too much of a bite at once. Without knowing better your situation, perhaps OpenFOAM would probably be better for this kind of internal flow simulation.
Kind regards