CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

How to solve for transport with large source term

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

LinkBack Thread Tools Display Modes
Old   February 1, 2007, 11:54
Default How to solve for transport with large source term
Posts: n/a

I am developing FORTRAN code for catalytic combustion: 1D transport with hetergeneous reaction occuring on side wall. The mass transfer from the bulk flow to the catalyst surface is modeled by emperical correlation ( Sherwood number = 4.0). The species concentration at the catalyst surface, which is implicit, must be be determined by the flux balance between the transport from the bulk flow to the surface and the total reaction rate in catalyst. I realized it is time comsuming to get the converged solution. Could any one tell me if there is any good scheme for this aplication ? (BTW, this is different from the general homogeneous combustion, which does not need to solve the additional surface concentration for mass balance purpose)

Thanks for your advice and comments in advance!

  Reply With Quote

Old   February 2, 2007, 04:02
Default Re: How to solve for transport with large source t
Posts: n/a
what kind of equation do you obtain by the flux balance.May be people can give some idea looking at it as a mathematical problem.
  Reply With Quote

Old   February 2, 2007, 10:31
Default Re: How to solve for transport with large source t
Posts: n/a
Thanks for your response, Harish.

The additional equation need to solve is the mass flux balance:

h(Y_bulk - Y_surf) = ReactionRate(Y_surf)

where Y_bulk is the species concentration of the bulk flow, and Y_surf is the concentration at the surface. Y_bulk will be solbed with 1D transport (NS eqn) and the local reaction rate is a function of surface species concentration, temperature and catalyst loading.

The difficulity comes from the implicit Y_surf, which may affect the reaction rate greatly.

Any sugestion is highly appriciate.

  Reply With Quote


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
swak4foam building problem GGerber OpenFOAM Installation 54 April 24, 2015 16:02
Large source term in species equation MACFD FLUENT 4 January 4, 2011 15:16
OpenFOAM on MinGW crosscompiler hosted on Linux allenzhao OpenFOAM Installation 127 January 30, 2009 20:08
UDF Source Term Units? Brian FLUENT 1 October 24, 2005 09:15
Can we solve only convective and source term Mehdi Main CFD Forum 1 February 18, 2004 00:40

All times are GMT -4. The time now is 03:38.