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-   -   Analysis of Hydrodynamic Joural Bearing Using CFD (http://www.cfd-online.com/Forums/fluent/123901-analysis-hydrodynamic-joural-bearing-using-cfd.html)

riphaldo September 24, 2013 01:01

Analysis of Hydrodynamic Joural Bearing Using CFD
 
Hi all,

I'm presently working on analyzing the motion of hidrodynamic journal bearing using CFD. I have followed the steps that given in the journals written by C.A. Papadopoulos and G. Descombes. However, it appeared that my results are different from their work. Instead of having the negative pressure at the opposite face of positive pressure, the negative pressure just beside the positive. Are there anything wrong with my boundary condition? I used laminar, isothermal, moving mesh for the journal and stationary wall for bearing shell. I also do not have any experience in using UDF to neglect the negative pressure and define the bearing motion. I would really appreciate your help. Thanks

Dinesh_Dhande October 4, 2013 10:30

Can u send me ur case in detail. I am also working on the same and have got the results similar to Papadopoulos papaer ( pattern is same.). Plz pm me.

riphaldo October 26, 2013 15:31

Thank you Dinesh for your response. I have sent you my modeling condition. I hope you can help me out.

Dinesh_Dhande October 27, 2013 18:29

i didn't get ur BC,s. repost it.

riphaldo October 30, 2013 00:19

For boundary condition, the journal is defined as moving wall with determined angular velocity, the bearing and side surfaces are defined as stationary wall with constant temperature (300 K). Therefore, the condition of viscosity alteration by the changes of Temperature can be achieved. However, is it possible to set one of the side surface as the pressure outlet and the other side surface as pressure inlet as written by Papadopoulos in his paper? Beacause I still can not reach the convergence if I set the pressure at that both side surfaces with 0 Pa, it just kept saying that there is the reverse flow on the face. How can I fix this?

khosikhan April 22, 2014 20:10

Ehl
 
Hi all,

I'm new to Openfoan, and trying to model Elastohydrodynamics condition for point contact. I guess it should be similar to what you've done. Can you please send me your work so I have an idea how to start the modeling. Thanks.


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