CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

How to solve coupled transport equations

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 20, 2008, 19:21
Default Hi All I would like to solv
  #1
Senior Member
 
Vishal Nandigana
Join Date: Mar 2009
Location: Champaign, Illinois, U.S.A
Posts: 208
Rep Power: 18
nandiganavishal is on a distinguished road
Hi All

I would like to solve coupled transport equations (not using relaxation technique). Can someone help me which tutorial I should go about looking to solve my problem.

These are my equations

ddt(C1) = - K1 * laplcian(C1) - K2 * laplacian (phi)
ddt(C2) = - K1 * laplcian(C2) - K2 * laplacian (phi)
K3 * laplacian (phi) = K4

where k1,k2,k3,k4 are some constant values..

Kindly help me out. I tried searching in the forum and could not get any information pertaining to this. I don't think I can use conjugate heat transfer solver for this.


Vishal
nandiganavishal is offline   Reply With Quote

Old   November 21, 2008, 01:22
Default Look at scalarTransportFoam in
  #2
Member
 
Prashant Ojha
Join Date: Mar 2009
Posts: 38
Rep Power: 17
prashant24983 is on a distinguished road
Look at scalarTransportFoam in the '$FOAM_SOLVERS/basic' folder
prashant24983 is offline   Reply With Quote

Old   November 21, 2008, 02:41
Default What about solving your equati
  #3
caw
Member
 
Christian Winkler
Join Date: Mar 2009
Location: Mannheim, Germany
Posts: 63
Rep Power: 17
caw is on a distinguished road
What about solving your equations in a segregated manner?

First solve:
K3 * laplacian (phi) = K4
and then:
ddt(C1) = - K1 * laplcian(C1) - K2 * laplacian (phi)
ddt(C2) = - K1 * laplcian(C2) - K2 * laplacian (phi)

or is there any coupling in C1 and C2?

Best regards
Christian
caw is offline   Reply With Quote

Old   November 21, 2008, 16:53
Default Hi Christian and Prashanth,
  #4
Senior Member
 
Vishal Nandigana
Join Date: Mar 2009
Location: Champaign, Illinois, U.S.A
Posts: 208
Rep Power: 18
nandiganavishal is on a distinguished road
Hi Christian and Prashanth,


Thanks a lot for the reply. I just missed one term in my equation. The equations look like this,

ddt(C1) = K1 * laplcian(C1) + K2 * laplacian (phi)
ddt(C2) = K1 * laplcian(C2) + K2 * laplacian (phi)
K3 * laplacian (phi) = K4 * f(C1) + K5 * f(C2) (Further this is a stiff equation)

where k1,k2,k3,k4 and k5 are some constant values.. I want to solve them directly and not using relaxation procedure.

Kindly offer some suggestions as to how to go about solving them. May I know which tutorial i have to follow.

Thanking You

Vishal
nandiganavishal is offline   Reply With Quote

Old   November 22, 2008, 17:43
Default Thanks a lot for the reply. I
  #5
Senior Member
 
Vishal Nandigana
Join Date: Mar 2009
Location: Champaign, Illinois, U.S.A
Posts: 208
Rep Power: 18
nandiganavishal is on a distinguished road
Thanks a lot for the reply. I just missed one term in my equation. The
equations look like this,

ddt(C1) = K1 * laplcian(C1) + K2 * laplacian (phi)
ddt(C2) = K1 * laplcian(C2) + K2 * laplacian (phi)
K3 * laplacian (phi) = K4 * f(C1) + K5 * f(C2) (Further this is a
stiff equation)

where k1,k2,k3,k4 and k5 are some constant values.. f(C1) and f(C2) means the equation is a function of C1 and C2.

I want to solve
them directly and not using relaxation procedure.

Kindly offer some suggestions as to how to go about solving them. May
I know which tutorial i have to follow.

Thanking You

Vishal
nandiganavishal is offline   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
How to solver coupled transport equations chris1980 OpenFOAM Running, Solving & CFD 8 October 29, 2019 08:15
How to add transport equations alimansouri OpenFOAM Running, Solving & CFD 6 January 12, 2009 17:20
Solve Coupled Equations nandiganavishal OpenFOAM Running, Solving & CFD 1 November 12, 2008 23:47
Coupled equations solution litonx OpenFOAM Running, Solving & CFD 7 February 14, 2007 19:31
Coupled mass and heat transport yves OpenFOAM Running, Solving & CFD 1 May 5, 2006 06:33


All times are GMT -4. The time now is 11:15.