help me !

[lbmcoding]

Hi guys,
I need your help, I want to know that if there is way to simulating a rotating cylinder, for example, giving a rotating speed to a 2d cylinder, please help me!! Thanks very much!!

[mathias]

For a rotaing cylinder you just need to change the boundary conditon but we also have a cylinder coordinate system implementation. For it please check out the code in frameChange* .

Best
Mathias

[lbmcoding]

Dear mathias,
Thanks very much for your message, you mentioned that I just need to change the boundary condition, but I’m still confusing about this, as far as I know, to model the moving boundaries, the Bouzidi boundaries should be modified, and an expression term should be added. Am I right? Should I modefied this in OpenLB?Or there is anohter simple way. Look forward to your reply! Thanks very much!

[mathias]

If the roting system is symmetric, yes. Then only the BC needs to be chanced and a force term needs to be add. That is right. Yes, and for Bouzidi we have a velocity term included.

Best
Mathias

[lbmcoding]

Dear Mathias,
Should I need to modified the source code of bouzidi boundary condition?I thinks it’s a real challenge. Do you have anohter good suggestions?thank you!

[mathias]

You actually can use any BC you want. For Bouzidi, the chance is not really complicated. Please, look at cylinder3d or our aorta3d example.

Best
mathias

[lbmcoding]

Thanks very much for your help!!

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