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-   -   A body in a rotating frame (http://www.cfd-online.com/Forums/star-ccm/66127-body-rotating-frame.html)

sangrar July 6, 2009 20:11

A body in a rotating frame
 
Hello,

I am a new user of star-CCM+. Currently I am modeling a rotating passage. What I did is using the "moving reference frame" option and apply the rotating properties for entire region. The inlet condition is mass inlet plus "normal to boundary surface". When I checked the result, on the wall, the relative velocity is zero and absolute velocity is omega*R, which are correct.

However, the inlet B.C. seems wield. Its absolute velocity is normal to boundary surface while its relative velocity includes the rotating speed. It seems to me that only the wall rotates while all the B.C. surfaces still stay stationary and do not rotate.

I guess that I must missed something and wonder if anyone can help with it.

Thanks & regards,
Sangrar

nvtrieu July 7, 2009 12:24

Hello Sangrar,

I'm a new one in Star-CCM+ to. My problem has some similar things with yours. I want to simulate a ball (cylinder) which rotates in the fluid. But I haven't completed it yet. Can you show me more detail about the regions which you used in your simulation? and tell me step by step to do it.
Thanks alot!

Marcelo July 9, 2009 17:21

you could use 6dof see the boat tutorial

sangrar July 10, 2009 11:19

Thanks. I will try it. It seems that the "moving reference frame" option can not allow a relative velocity normal to the boundary surface in a rotating frame.


Quote:

Originally Posted by Marcelo (Post 222147)
you could use 6dof see the boat tutorial


sangrar July 10, 2009 11:21

What I did is to use the "moving reference frame" and then set the rotating properties for the entire region. But it seems not correct on boundaries.

Quote:

Originally Posted by nvtrieu (Post 221807)
Hello Sangrar,

I'm a new one in Star-CCM+ to. My problem has some similar things with yours. I want to simulate a ball (cylinder) which rotates in the fluid. But I haven't completed it yet. Can you show me more detail about the regions which you used in your simulation? and tell me step by step to do it.
Thanks alot!


saleh alsubari August 12, 2012 23:03

Quote:

Originally Posted by sangrar (Post 222286)
What I did is to use the "moving reference frame" and then set the rotating properties for the entire region. But it seems not correct on boundaries.

what do u mean by set the properties for the entire region , cuz what i see there is only one property under region(physical values)..
any advised please


thanx


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