CFD Online URL
[Sponsors]
Home > Forums > FLUENT

UDS formulation for axisymmetric domains URGENT

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 7, 2008, 15:05
Default UDS formulation for axisymmetric domains URGENT
  #1
Sandilya Garimella
Guest
 
Posts: n/a
Hello All

I am trying to solve for UDS in Fluetn with an Axisymmetric model

But the UDS theory is given for 2D models but not for axisymmetric models

I am not sure what to do!!!

Should I write UDF for a 2D domain using theory given in Fluent Manual and incorporate the same into my axi-symmetric model

Please let me know

Thank you.

Regards Sandilya
  Reply With Quote

Old   April 8, 2008, 04:15
Default Re: UDS formulation for axisymmetric domains URGEN
  #2
Aris Nikolopoulos
Guest
 
Posts: n/a
Yes, it's the same!

There are some minor differences though in axisymetric! Not in UDS but in all UDFs.

For example be carefull with some functions (C_VOLLUME) because sometimes multiply their output with (2*PI)
  Reply With Quote

Old   April 10, 2008, 10:19
Default Re: UDS formulation for axisymmetric domains URGEN
  #3
Sandilya Garimella
Guest
 
Posts: n/a
thank you very.

The reason for my question is that i am solving for electric potential and charge transport in bulk gas flow

In a 2d model the equations converge

But in Axisymmetric setting, the charge transport equation diverges immediately

I am not able to understand the reason
  Reply With Quote

Old   April 14, 2008, 05:32
Default Re: UDS formulation for axisymmetric domains URGEN
  #4
Rami
Guest
 
Posts: n/a
You should look at the UDS as a tensor scalar transport equation. Then, you can explicitly write it in ANY coordinate system (including 2D Cartesian, axisymmetric etc). All you need is to know how the tensor terms, like covariant derivatives, are presented in your system. For axisymmetric cylidrical system, you may find these equations in most texbooks, and maybe even in Fluent documentation.
  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
Sub Domains prakash CFX 4 May 22, 2008 11:43
Sub domains? Chris Wetton CFX 1 February 24, 2008 17:47
Two Domains kdarc OpenFOAM Running, Solving & CFD 1 March 13, 2007 13:08
URGENT ! Need help on Axisymmetric Flow ! Suman Kumar Main CFD Forum 1 November 20, 2001 15:51
URGENT Multi-Domains calculation Khalel A. Main CFD Forum 6 April 15, 1999 10:17


All times are GMT -4. The time now is 09:00.