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-   -   Multiple rotating frame VS dynamic mesh (http://www.cfd-online.com/Forums/fluent/37114-multiple-rotating-frame-vs-dynamic-mesh.html)

Jen June 30, 2005 17:23

Multiple rotating frame VS dynamic mesh
 
I am modeling a domain, part of it is rotating (a ball), and part of it is stationary (a chamber). Should I use multiple rotating frame or dynamic mesh? Thanks

zxaar June 30, 2005 22:55

Re: Multiple rotating frame VS dynamic mesh
 
this is pretty interesting case, with MRF, for spheres i ahve observed that fluent calculates negative lift coefficient(i ahev done more than 10 different cases with it). its better to use dynamic or moving mesh with it. at least the sign of the lift is okey.


Jen July 1, 2005 09:58

Re: Multiple rotating frame VS dynamic mesh
 
Really? They yield different results? But the latter seems more difficult :(

zxaar July 2, 2005 06:31

Re: Multiple rotating frame VS dynamic mesh
 
yes, but we are not able to find the solution to this problem, fluent support also is answerless, fianlly we are only using sliding mesh approach which is easy to use (if does not give u negatve volumes or handedness prob)


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