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

Cylindrical cordinate system

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 23, 2009, 02:28
Default Cylindrical cordinate system
  #1
Member
 
Hamoudi djamel
Join Date: Apr 2009
Posts: 50
Rep Power: 8
hamoudi is on a distinguished road
Hi Everybody,

I have a problem,I have 2D simulation i build my geometry and my Mesh in ICEM-CFD, then I export them to Star-cd, all thing is well in the same coordinate system cartesian to cartesian coordinate system.

But when i build my geometry and do my Mesh (ICEM-CFD) in cylindrical coordinate system in (r,theta,z)
then i have my geometry in (y,z) plane, so for the velocities
the radial velocity
U(r) is in -------- y direction
and U (theta) tangential velocity is in --------x direction
and U(z) is in ------------------------------- z direction

----------------------------------------------------------------
after that i export my Mesh to Star-CD
in boundary condition at the inlet part i change the coordinate system
from cartesian to cylindrical from number 1 to number 2
from ( x,y,z) to (r,theta,z)
then Star-CD consider that
the radial velocity U(r) is --------------------- in x direction
U (theta) is ----------------in y direction
U(z) is ---------------------in z direction

-------------------------------------------------------------------
so you can observe that there is a confusion in the axis from the initial case I try to do changement of the velocities to the axis
I put U(r) in y direction and U (theta) in x direction then my simulation did not convergt i have got a bad convergence
----------------------------------------------------------------------
I am in waiting for your suggestion

Thank you very much for you
hamoudi 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
CFX11 + Fortran compiler ? Mohan CFX 20 March 30, 2011 18:56
Cylindrical cordinate system hamoudi STAR-CD 2 July 24, 2009 11:00
change coordinate system cartesian to cylindrical tht FLUENT 0 September 6, 2007 05:46
creat CYLINDRICAL COORIDNATE SYSTEM by vertex xhliu1 CD-adapco 2 September 1, 2004 23:22
Multigrid method for cylindrical coordinate system chinthakindi Main CFD Forum 5 November 1, 2003 15:46


All times are GMT -4. The time now is 20:37.