CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

Combination of cartesian and cylindrical coordinate system

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 30, 2011, 17:32
Default Combination of cartesian and cylindrical coordinate system
  #1
New Member
 
Join Date: Jul 2010
Posts: 10
Rep Power: 7
Hermano is on a distinguished road
Hi,

I have to solve a numerical problem namely how air is flowing first through a porous medium followed by streaming of the air coming out of the porous medium in a very narrow channel flowing to the ambient (journal porous air bearing).

This problem can be described with the use of two equations namely the Laplace equation describing the flow in the porous media, and the Reynolds equation describing the flow in the gap.

These equations must be solved both separately on an iterative manner until the pressure at the boundary between the porous media and the gap is equal to each other (continuity).

My question is: Can I use a cartesian coordinate system for solving the Reynolds equation (flow in the gap) and a cylindrical coordinate system for solving the Laplace equation (flow in the porous media) if I take care that the nodes where I calculate the pressure at the boundary between the gap and the porous media lie at the same place?
Hermano is offline   Reply With Quote

Old   November 30, 2011, 22:07
Default
  #2
Senior Member
 
Arjun
Join Date: Mar 2009
Location: Nurenberg, Germany
Posts: 373
Rep Power: 10
arjun is on a distinguished road
Quote:
Originally Posted by Hermano View Post
Hi,

I have to solve a numerical problem namely how air is flowing first through a porous medium followed by streaming of the air coming out of the porous medium in a very narrow channel flowing to the ambient (journal porous air bearing).

This problem can be described with the use of two equations namely the Laplace equation describing the flow in the porous media, and the Reynolds equation describing the flow in the gap.

These equations must be solved both separately on an iterative manner until the pressure at the boundary between the porous media and the gap is equal to each other (continuity).

My question is: Can I use a cartesian coordinate system for solving the Reynolds equation (flow in the gap) and a cylindrical coordinate system for solving the Laplace equation (flow in the porous media) if I take care that the nodes where I calculate the pressure at the boundary between the gap and the porous media lie at the same place?
Yes. I did this for pressure poisson equation. In fact you can exploit direct solvers to efficiently do it.
arjun is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
cylindrical coordinate vs cartesian coordinate Lam FLUENT 10 May 11, 2013 13:05
cylindrical to Cartesian coordinate bharath CFX 0 June 6, 2010 21:43
change coordinate system cartesian to cylindrical tht FLUENT 0 September 6, 2007 05:46
cartesian to cylindrical coordinate UDF Manoj FLUENT 0 December 15, 2005 10:43
cartesian to coordinate system ? opolanin FLUENT 1 July 18, 2005 08:17


All times are GMT -4. The time now is 04:16.