Periodic boundary conditions for moving reference frame (MRF) simulation)

guebelib · April 14, 2015, 11:33

Hej!

I'm new to starccm+, trying to set up a moving reference frame simulation for a hydrodynamic bearing (spiral groove bearing).

Since I don't want to simulate the whole bearing (too high computational cost), I imported the geometry of only 36°-part, which should be rotationally repeated (10x).

With tutorials I got as far as setting up periodic interfaces for the boundaries...

Does anyone have experience on which physics conditions/values I have to set for the periodic interface?
The fluid should not be driven by a pressure jump or mass flow, but just by the rotating part (i.e. the part in MRF) above the bearing.
I did try it with setting the pressure jump to 0.0Pa (zero), but the simulation didn't converge...

Thank you!

ggulgulia · April 15, 2015, 07:55

Hi
Periodic boundaries are used to mirror the flow fields from one boundary to another amongst the boundaries in the interface. They do not need any physics condition per se.

I guess you are trying to simulate 3d axisymmetric case where I do not see any moving reference frame fitting in the bearing simulation.

April 14, 2015, 11:33	Periodic boundary conditions for moving reference frame (MRF) simulation)	#1
guebelib New Member Bettina Join Date: Apr 2015 Posts: 1 Rep Power: 0	Hej! I'm new to starccm+, trying to set up a moving reference frame simulation for a hydrodynamic bearing (spiral groove bearing). Since I don't want to simulate the whole bearing (too high computational cost), I imported the geometry of only 36°-part, which should be rotationally repeated (10x). With tutorials I got as far as setting up periodic interfaces for the boundaries... Does anyone have experience on which physics conditions/values I have to set for the periodic interface? The fluid should not be driven by a pressure jump or mass flow, but just by the rotating part (i.e. the part in MRF) above the bearing. I did try it with setting the pressure jump to 0.0Pa (zero), but the simulation didn't converge... Thank you!

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April 15, 2015, 07:55		#2
ggulgulia Senior Member Gajendra Gulgulia Join Date: Apr 2013 Location: Munich Posts: 144 Rep Power: 13	Hi Periodic boundaries are used to mirror the flow fields from one boundary to another amongst the boundaries in the interface. They do not need any physics condition per se. I guess you are trying to simulate 3d axisymmetric case where I do not see any moving reference frame fitting in the bearing simulation.