CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

laplacian problem

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

LinkBack Thread Tools Search this Thread Display Modes
Old   August 20, 2011, 16:56
Question laplacian problem
Senior Member
Mieszko Młody
Join Date: Mar 2009
Location: POLAND, USA
Posts: 145
Rep Power: 17
ziemowitzima is on a distinguished road
Dear Foamers,

I am trying to solve following problem:
Fun = Fun (x,y)
Fun_xxxx = f(x,y),
where ()_xxxx, denotes 4th order derivative in respect to x.
To do this I changed the original problem to, set of two two-order equations:

H_xx = f(x,y)
Fun_xx = H.

To solve it in OpenFoam I am usning fvm::laplacian(1D,fun) operator with 1D being a tensor, definite as follows:
1D = (1 0 0;
0 0 0;
0 0 0),
what force laplacian operator to act only in x-direction.
In OF it looks like:

fvm::laplacian(1D, H) - f
fvm::laplacian(1D, Fun) - H

But unfortunately it gives wrong results ...
Does anyone of you know what is here wrong ?

thanks a lot
ziemowitzima is offline   Reply With Quote


diffusion coefficient, laplacian, non-uniform, operator, viscosity

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
Problem with interFoam; Wave/wiggle alpha1 behavior JonW OpenFOAM 10 February 4, 2023 07:27
UDF compiling problem Wouter Fluent UDF and Scheme Programming 6 June 6, 2012 04:43
natural convection problem for a CHT problem Se-Hee CFX 2 June 10, 2007 06:29
Adiabatic and Rotating wall (Convection problem) ParodDav CFX 5 April 29, 2007 19:13
Is this problem well posed? Thomas P. Abraham Main CFD Forum 5 September 8, 1999 14:52

All times are GMT -4. The time now is 03:57.