Particles spurt out from inlet

liyt54299liyt54299
in DualSPHysics v5.0

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 There was an error displaying this embed. https://forums.dual.sphysics.org/uploads/011/WF02P0M60BS4.png There was an error displaying this embed.


After a few steps simulate, the situation become like this:

out.png


  1. the first and most important problem is that particles would spurt out from inlet.
  2. 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

  • circlescircles

    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.

  • Asalih3dAsalih3d

    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

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