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

Is CFD coding in finite element method a formidable job?

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

LinkBack Thread Tools Search this Thread Display Modes
Old   June 18, 2010, 20:53
Default Is CFD coding in finite element method a formidable job?
Join Date: Jul 2009
Location: Ohio
Posts: 35
Rep Power: 16
bearcat is on a distinguished road
Send a message via MSN to bearcat
Anyone has the experience in coding CFD using FEM?

I am on my beginning on this. But I find that coding FEM for CFD is a very tough job, particularly in deriving the stiff matrix coefficients. Suppose we use Q1Q1 element for a 2D incompressible flow problem in a coupled way, we have u, v, p as unknown and 4 nodes in one elements using SUPG or GLS and equal order interpolation. Then the stiffness matrix will be 12 x 12 for each element. In 3D case, that will be 8 nodes and a 32 x 32 matrix. Then we need to numerically integrate 32 x 32 = 1024 coefficients, each with different expressions, all nonzero and derived by hand. If we use least-square finite element method, the expressions will be even more complicated.

Is my understanding correct? How do people code CFD by FEM?

Thank you.

BTY, if we use equal order interpolation, does that mean the same shape function for velocity and pressure?
bearcat 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
CFD Salary CFD Main CFD Forum 17 January 3, 2017 17:09
what is the Particl Finite element method ztdep Main CFD Forum 0 September 12, 2006 23:01
Finite Element vs Cartesian Grip methods Sidi Main CFD Forum 0 December 15, 2005 10:40
finite volume VS finite element solomon Main CFD Forum 0 March 19, 2002 19:04
cfd job Dr. Don I anyanwu Main CFD Forum 20 May 17, 1999 15:13

All times are GMT -4. The time now is 21:59.