CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

boundary condition for species equation

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 3, 2004, 13:16
Default boundary condition for species equation
Posts: n/a
Hi,i am trying to set boundary condition for species equation. I want to set a fix gradient of species at wall as the boundary condition. However, the fluent at wall boundary for species only has two options,one is to set species mass fraction, another is to set gradient of species equal to zero. Does anyone know how to set this kind boundary condition? Thanks a lot.
  Reply With Quote

Old   June 3, 2004, 16:15
Default Re: boundary condition for species equation
Posts: n/a
I think in your problem, mass fraction values will be solved for in the domain. thus the value at the boundary will need to be changed depending on the value of mass fraction in the cell next to the boundary. since you dont know that values till you have solution for the previous time step, you will have to use UDf to change the mass fraction value to maintain the gradient value. please refer to UDf manual. I think define_profile should work.
  Reply With Quote


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
Water subcooled boiling Attesz CFX 7 January 5, 2013 03:32
External Radiation Boundary Condition for Grid Interface CFD XUE FLUENT 0 July 9, 2010 02:53
vorticity boundary condition bearcharge Main CFD Forum 0 May 14, 2010 11:32
Poisson equation for pressure homogeneous boundary condition RenardP Main CFD Forum 1 July 13, 2009 10:01
The Boundary Condition about the Flat Plate boing Main CFD Forum 1 January 6, 2002 16:53

All times are GMT -4. The time now is 13:01.