Comments (2)
This issue is due to incorrect free surface calculations.
Only the inside of the fluid should apply the simulation calculation, and the outside (free surface) should be extrapolated.
As an exact extrapolation method has not yet been found, this issue is not closed.
from gridliquid2d.
This issue is, as expected, a free surface issue.
The air region where no simulation step is applied has zero velocity.
However, in semi-Lagrangian and projection, a velocity outside the fluid is required.
Therefore, the free surface bondary condition is applied. (e.g. extrapolation)
Here, only values ββin 4 directions are required by the CFL condition and discrete Laplacian.
Therefore, it is sufficient to extrapolate only adjacent cells (grey areas) of the fluid as shown below.
from gridliquid2d.
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