Simulating object rotating within fluid

ray1988 · June 25, 2019, 10:47

I am learning Simflow which uses openfoam as its backend so asking this question here as I am not aware of any simflow online community. I am trying to understand how to perform a simulation with a rotating object. There are two tutorials (links below), neither of which mesh the object to be rotated. In one example they use dynamic mesh to rotate one of the meshed fluid regions and in another they define a cell zone within the fluid and rotate the cell zone. What is happening and what is the difference between the two methods? It appears as if it is the fluid rather than the propeller that is being rotated but that makes no sense as the fluid elements would experience a centripetal acceleration.

https://help.sim-flow.com/userguide/propeller/
https://help.sim-flow.com/userguide/mixing-tank/

Krao · June 26, 2019, 11:32

Hi Ray,

Sorry I don't have any idea about Simflow but go through this link, which would help you to understand the difference between dynamic mesh and frozen rotor technique(where there is no actual mesh motion EX: MRF and SRF) https://www.slideshare.net/fumiyanoz...using-openfoam

Krao

June 25, 2019, 10:47	Simulating object rotating within fluid	#1
ray1988 New Member Ray Join Date: Jun 2019 Posts: 1 Rep Power: 0	I am learning Simflow which uses openfoam as its backend so asking this question here as I am not aware of any simflow online community. I am trying to understand how to perform a simulation with a rotating object. There are two tutorials (links below), neither of which mesh the object to be rotated. In one example they use dynamic mesh to rotate one of the meshed fluid regions and in another they define a cell zone within the fluid and rotate the cell zone. What is happening and what is the difference between the two methods? It appears as if it is the fluid rather than the propeller that is being rotated but that makes no sense as the fluid elements would experience a centripetal acceleration. https://help.sim-flow.com/userguide/propeller/ https://help.sim-flow.com/userguide/mixing-tank/

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June 26, 2019, 11:32		#2
Krao Senior Member Kmeti Rao Join Date: May 2019 Posts: 145 Rep Power: 8	Hi Ray, Sorry I don't have any idea about Simflow but go through this link, which would help you to understand the difference between dynamic mesh and frozen rotor technique(where there is no actual mesh motion EX: MRF and SRF) https://www.slideshare.net/fumiyanoz...using-openfoam Krao