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

deal with coupled equations

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

LinkBack Thread Tools Display Modes
Old   July 27, 2011, 16:09
Default deal with coupled equations
New Member
Join Date: Mar 2009
Posts: 4
Rep Power: 10
Mehrdad is on a distinguished road

Actually, I am working on simulating the battery characteristics based on the control volume discretization. But, two equations in my model are coupled non-linearly. First equation is for concentration of lithium ions and second is for charge distribution across the battery (I attached a photo of these two Eqs). The later equation consist of a term as follows:

\kappa\frac{\partial^{2}ln c}{\partial x^{2}}

where kappa is a constant and c is the concentration of Lithium ion.

I decided to lag this term and use the concentrations from the previous iteration, so I sent this term to RHS and dealt with it as a source term. But, it caused a large amount of error.

I do not know how can I treat this term differently. So, any new idea is very welcome.

I really appreciate your helps in advance.
Attached Images
File Type: jpg Eqs.JPG (7.3 KB, 8 views)
Mehrdad is offline   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
Coupled Equations ? T.D. OpenFOAM 0 May 4, 2011 06:28
coupled source term in 3 transport equations mhassani OpenFOAM Running, Solving & CFD 0 February 26, 2011 05:14
problem with gradient as source term in coupled equations Cyp OpenFOAM Programming & Development 0 August 16, 2010 13:12
coupled Navier-Stokes and convection-diffusion equations using in cfx rystokes CFX 0 November 2, 2009 06:14
How to solve coupled transport equations nandiganavishal OpenFOAM Running, Solving & CFD 4 November 22, 2008 17:43

All times are GMT -4. The time now is 04:48.