CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS

ANSYS Multiphysics Bearing Simulation

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 12, 2010, 07:35
Default ANSYS Multiphysics Bearing Simulation
  #1
New Member
 
Dimitris Bobos
Join Date: Feb 2010
Location: Patras,Greece
Posts: 1
Rep Power: 0
Dimitris is on a distinguished road
Hello everyone,

I am trying to simulate a journal bearing system via ANSYS Mutliphysics with FLUID142 elements. I have created a macro with witch I handle all the specifics of the simulation (geometry, boundary conditions etc). The solution process concludes normally but the results that I am getting are allways twice the normal value. I have checked my input and all seem to be right. No systematic/arithmetic error has been detected. Both the maximum pressure angle and the resulting pressures are wrong with the latter being two times higher than the appropriate ones. The residuals are very low (below 1e-6). Velocities on the other hand and all the relevant properties of the fluid are correct. In brief my boundary conditions are:
1.Tangential speed of journal in journal surface
2.Sommerfeld Condition is apllied directly to the (appropriate) half of the flui volume
3.Velocities of bearing walls are set to 0
And the most curious is that I am getting the same results both in 3D and 2D simulation (i have made both 2d and 3d models)
The coordinate system is Cartesian.

Thank you
Dimitris is offline   Reply With Quote

Old   September 24, 2010, 12:42
Default
  #2
Member
 
h-h
Join Date: Sep 2009
Posts: 38
Rep Power: 16
hosseinhgf is on a distinguished road
hi
i have same problem.
i use cfx to simulation a journal bearing in 3d. the mesh is 700*15*30(theta,r,z) from gambit.i know the half sommerfeld condition must be applied but i dont know how.the pressure and force on journal is bigger than the real results.
d=50mm
L=25mm
mu=1.25e-2
eccentricity ratio=0.5
attitude angle=49
clearance =0.05mm
is it suitable to simulation with ansys mutiphysic?
how you can use half sommerfeld condition?
hosseinhgf is offline   Reply With Quote

Old   November 10, 2011, 06:17
Default journal bearing Tilting pad bearing
  #3
New Member
 
Ali
Join Date: Jul 2010
Posts: 1
Rep Power: 0
arz83 is on a distinguished road
I want to model tilting pad bearing with Ansys-CFX (Fluid-structural interface)
Can I know ablout your code?
arz83 is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
simulation of a radial hydrodynamic bearing in ANSYS CFX Jalen ANSYS 1 October 4, 2013 11:40
How to model concrete slab in ANSYS and apply 2 million cyclic load. jjc ANSYS 3 April 12, 2011 05:47
valve simulation in ansys cfx Franco CFX 0 July 3, 2008 06:33
Multiphase radiation in Ansys 10 problem Luk CFX 2 June 5, 2008 12:31
3-D Contaminant Dispersal Simulation Apple L S Chan Main CFD Forum 1 December 23, 1998 11:06


All times are GMT -4. The time now is 08:10.