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

Macro to calculate Diffusion at Inlets

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 17, 2003, 02:42
Default Macro to calculate Diffusion at Inlets
Posts: n/a

In the segregated solver in FLUENT, the net transport of species at inlets consists of both the convection and diffusion components. (For the coupled solvers, only the convection component is included.) The convection component is fixed by the inlet species concentration specified by you. The diffusion component, however, depends on the gradient of the computed species concentration field. Thus the diffusion component (and therefore the net inlet mass transport) is not specified a priori. In my Postproccessing UDF (EXECUTE-ON-DEMAND), I want to compute the net inlet mass flow (convection + diffusion) of a certain species. The product of F_FLUX(f,t) * F_YI(f,t,i) at that inlet boundary only computes the convective mass transport of that species. How can I access the diffusive component of that species ?

Thanks, Sridhar.

  Reply With Quote

Old   November 22, 2011, 16:04
Join Date: Aug 2010
Posts: 62
Rep Power: 15
natantyt is on a distinguished road

did you find any answer to your question? How can I calculate the diffusive flux at the boundary?

natantyt is offline   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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
How to calculate Diffusion level Suresh Main CFD Forum 0 December 12, 2008 12:29
Help! How to calculate the diffusion flux of a UDS lzw FLUENT 0 June 18, 2008 03:50
Species diffusion coefficient iceabc FLUENT 1 June 10, 2004 10:04
Need a macro to compute Diffusion at Inlets Sridhar FLUENT 0 July 15, 2003 01:12

All times are GMT -4. The time now is 11:45.