# Foil Bearing Simulation

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November 25, 2011, 02:34
Foil Bearing Simulation
#1
New Member

Balaji Sankar
Join Date: Nov 2011
Posts: 19
Rep Power: 13
Hi all,

I have to simulate the orbit(path taken by the centre ) of the shaft in a foil bearing with air as the lubricant instead of oil. The foil bearing is same as the Journal bearing except that the boundary is deformable and not rigid like a journal bearing. There is a pressure build up because shaft is rotating and dragging the air around it into a narrow channel.(See image) I obviously need to solve the

a) Pressure build up in the fluid
b) Deformation of the boundary due to the built up pressure.
c) Motion of the shaft centre inside the bearing in response to the pressure and its own rotation.

Hope I am clear.

1) Has anyone solved this in OpenFOAM before.?
2) what are the solvers I should read up on?

Any pointers to start or links to similar solved problems will be very usefull.
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 November 25, 2011, 04:32 #2 Senior Member   Elvis Join Date: Mar 2009 Location: Sindelfingen, Germany Posts: 618 Blog Entries: 6 Rep Power: 22 Hi, maybe http://powerlab.fsb.hr/ped/kturbo/Op...dicPhD2005.pdf Doctorate Thesis: Advanced Modelling of Elastohydrodynamic Lubrication by Petra Brajdic-Mitidieri http://powerlab.fsb.hr/ped/kturbo/Op...riImperial.pdf is something for you

 November 28, 2011, 04:20 #3 New Member   Balaji Sankar Join Date: Nov 2011 Posts: 19 Rep Power: 13 Thanks Elvis. I will see what Brajdic has done in his Thesis.

May 1, 2013, 10:20
Help
#4
New Member

Fabian
Join Date: May 2013
Posts: 3
Rep Power: 11
Quote:
 Originally Posted by Bajji Thanks Elvis. I will see what Brajdic has done in his Thesis.
Bajji, could you finally model the bearing?, I need to do the same and if you can help me, with something like with solver did you use (rhoSimplecFoam, rhoCentral foam) or more datails I will be very helpull.

 May 2, 2013, 00:47 Couldn't do it in openFOAM. #5 New Member   Balaji Sankar Join Date: Nov 2011 Posts: 19 Rep Power: 13 Hi fpierart, I did finally model the bearing with shaft motion inside it. But I gave up on openFOAM and wrote the Reynold's equation solver (I tried FDM and FVM) in C++ from scratch. It worked. I got pretty good agreements between simulated and published pressure distributions at mid plane. I want to make clear that it was not a problem with openFOAM. I simply couldn't get that monster working. Have great time, Balaji Sankar.

 Tags bearings, fsi, openfoam, shaft dynamics