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

Coordinate system

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 6, 2002, 06:54
Default Coordinate system
  #1
Franch
Guest
 
Posts: n/a
How can I ***really*** change my coordinate system?

I have I cylindrical object imported in pro*am to be meshed (I have to do it in pro*am). For this model comes from a more complex drawning, when imported, the global cartesian coordinate system doesn't match with any interesting direction of the model.

In particular, I would like one axis to match exactly with the axis of the cylinder (direction of the flow). This way, I will be allowed to have only one primary variable velocity.

But, I suppose, primary variable velocities are defined in the global cartesian system. Even if I change the active system, or I move vertices by VTRANS, I won't be allowed to change volocities...

So, what can I do?
  Reply With Quote

Old   March 6, 2002, 07:42
Default Re: Coordinate system
  #2
Richard
Guest
 
Posts: n/a
I think VTRANS is what you want; you can't move the global cartesian system but that's not a problem (think about it ... if everything is relative to the global system, which ultimately it is, then translating or rotating the global system must be exactly equivalent to translating or rotating the vertices themselves). You need to define a new coordinate system which is what you would like the global coordinate system to be, then use VTRANS to rotate/translate the vertices from your new system into the same orientation in the global system. The U, V and W velocities are aligned with the x, y and z axes of the global system, so you should be able to re-align your model so that the "primary direction" is aligned with one of the coordinate axes.
  Reply With Quote

Old   March 6, 2002, 07:56
Default Re: Coordinate system
  #3
Franch
Guest
 
Posts: n/a
Thank you, Richard, I was already using VTRANS but in the opposite (and wrong) way, assigning the ***local*** system as first parameter. Now it works, thank you.
  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
Coordinate System selim CFX 1 October 26, 2007 21:08
coordinate system raffap Siemens 0 February 7, 2007 06:39
What coordinate system? Ivan Siemens 0 December 12, 2006 07:04
Coordinate System Gede Main CFD Forum 2 November 27, 2006 19:51
Coordinate System Pravesh kumar FLUENT 7 November 26, 2002 09:50


All times are GMT -4. The time now is 08:00.