Fluid mesh with holes and refraction problems

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Hello, I just created this test animation using Houdini flip fluids. Samples as you can see are low so there is some flickering, but the problem is I see appearing and disappearing some parts of the refraction in random frames; with RedShift support we identified the cause, it seems that in some frames there is an additional internal surface, that sometimes disappears. You can see clearly the problem also in the still frames I attached.
Anyone knows what can be done to avoid this problem ?

I attached the scene too, just two frames, 179 and 180, refraction is different from one another. I split the attachment file in two because of the size limit.
Thank you

Ray

Edited by madrenderman - Feb. 5, 2018 12:36:53

Attachments:
spline.mp4 (3.9 MB)
f179.jpg (185.9 KB)
f180.jpg (181.9 KB)
flip1.zip (10.0 MB)
flip2.zip (8.9 MB)

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