SPH-DEM problem particle boundary out

Hi all,

I try simulate fluid solid interaction with SPH-DEM examples, particulary Canelas & Crespo results. In this work, how is gap in boundary and fluid particle?.

Should be 1.5h? and h = 1.2 * sqrt (3 * dp ^ 2)?

I do this but I still have problems between the boundary and fluid condition in the solid that moves.

appreciate you can help me



  • hi ... well thats due to the dynamic boundary condondiition... I you can try increasing the amount of fluid particles and hence the gap becomes smaller. In the canelas benchmark case I did not see nuch a gap. However in my modified cases I observed that the gap builts up with some time ... you might want to take care that you lower the cfl number and be carfule that the acceleration/pressure on the floatings is not perormed too suddenly. A bigger impact or shock by a fast accelerated fluid at least from my observations causes that the gap build up... Let me know if you oberve sth else...
  • I try simulating wave overtopping over a vertical wall and the gap builds up at the wall. Moreover gap width increases from bottom to the top of the wall. A Problem that hinders the comparison with physical model results. (see attachted figure).
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