MRF on single Boundary

sathishkrazy · July 13, 2018, 02:14

How to model/use MRF approach if i have very less clearance between Rotating region and wall, Ex: Impeller and Casing?

Clearance value is 0.5 mm

me3840 · July 18, 2018, 02:29

Just include the casing in the MRF region and set the velocity on the casing such that it's stationary.

sathishkrazy · July 19, 2018, 05:21

I did not understand
set the velocity on the casing such that it's stationary

could you Please elaborate
I am working in StarCCM+

me3840 · July 19, 2018, 09:31

If you put the impeller and casing in an MRF they act as if they're rotating with the MRF. All you want to do is change the boundary condition on the casing and set the velocity so that it's stationary with respect to the MRF.

July 13, 2018, 02:14	MRF on single Boundary	#1
sathishkrazy New Member sthish Join Date: May 2012 Posts: 11 Rep Power: 13	How to model/use MRF approach if i have very less clearance between Rotating region and wall, Ex: Impeller and Casing? Clearance value is 0.5 mm

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July 18, 2018, 02:29		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	Just include the casing in the MRF region and set the velocity on the casing such that it's stationary.

July 19, 2018, 05:21		#3
sathishkrazy New Member sthish Join Date: May 2012 Posts: 11 Rep Power: 13	I did not understand set the velocity on the casing such that it's stationary could you Please elaborate I am working in StarCCM+

July 19, 2018, 09:31		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	If you put the impeller and casing in an MRF they act as if they're rotating with the MRF. All you want to do is change the boundary condition on the casing and set the velocity so that it's stationary with respect to the MRF.