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Rough Flip surface

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I've done a flip simulation of filling an model with water,but I can't get a smooth water mesh.

The particlefluid surface somehow was very rough.I tried vdbsmooth node, bumping up the adaptivity on convertvdb node and the H15 way.but it's still not smoothy enough or mismatch the original model.

I even tried projecting the surface to the original model,but the result was'nt very ideal.

So I came up with an approach by simulating in a slightly enlarged model , and vdbcombine the vdb from particlefluid with the vdb from original model.I got smooth surface.

But this approach leads to missing some details and jittering.

Any way to get a smooth surface?


BTW,why there's no such problem in Realflow?




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