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Simulation of tiltable bucket with water

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Old   August 21, 2012, 07:31
Default Simulation of tiltable bucket with water
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jurij
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Hi!
At first, sorry for my terrible english ;-). I am trying to simulate a tiltable bucket with water. I am working with CFX-Ansys.
I made a PDF with pictures of my settings from this simulation in CFX. And I uploaded a video with solution of this simulation. I am not realy happy with solution of what a have. If you look at my video, you will see domain “water” peel off.
My question is, what i did wrong? why does water domain peel off?
Thank you.

Video Link 1:
http://www.cshare.de/file/d56af92663582f47e2b45b5de49e1aae/Fluiddynamik+CFX6.wmv.html


PDF Link:
http://www.cshare.de/file/4b5c62c250c62564ebf3e86a41bd27fb/bucket.pdf.html


Video Link 2:
http://www.cshare.de/file/edcc834d470d0520368859d69e217755/Fluiddynamik+CFX7.wmv.html
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Old   August 21, 2012, 19:43
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Glenn Horrocks
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Sorry, I do not have tiem to view your videos but I saw the PDF. Your mesh is very coarse around the bucket and this will cause massize smearing of the air/water interface. Simply putting a finer mesh will improve this a lot.
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Old   August 21, 2012, 20:49
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jurij
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Quote:
Originally Posted by ghorrocks View Post
Sorry, I do not have tiem to view your videos but I saw the PDF. Your mesh is very coarse around the bucket and this will cause massize smearing of the air/water interface. Simply putting a finer mesh will improve this a lot.
Hi!
I made a little bid other settings on interface between water and air dyn.
I changed the "pitch change" option from automatic to none and it works))))
Thank you!
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bucket, mesh displacement, moving mesh, rotating, wind turbine

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