About UEqn in icoFoam.
Hi All,
This is UEqn code in icoFoam: Code:
fvVectorMatrix UEqn Thanks in advance. 
Hi Forrest,
The key point is the type of the matrix, namely Code:
fvVectorMatrix Kind regards Niels 
Quote:
Can you tell me in this situations below,what is the fvvectormatrix? If there were just three nodes,after dixcretisation of the governing equation.I have: Code:
1 2 3 u_1 2 Code:
1 2 3 Code:

Any ideas?

I try to print the UEqn:
Code:
fvVectorMatrix UEqn Code:
Lower triangle = 4(0.05 0 0 0.05) Code:
Lower triangle = 7(0.05 0 0.05 0 0 0.05 0.05) 
no one is here?

1 Attachment(s)
[LaTeX Error: Syntax error]
In this formula, I think the left equation in Jasak's thesis page.145 eqn(3.136) have three componets, so there are three equations, but why is there only one matrix:Ueqn?where is Veqn and Weqn? 
Still does not get anywhere now.

Code:
Lower triangle = 7(0.05 0 0.05 0 0 0.05 0.05) 
1 Attachment(s)
This is a piece in Fabian Peng Karrholm's Ph.D thesis, :see the image.
OpenFOAM use A.22 to represent this three equations: A.18 A.19 A.20. But in this thesis there are no more explanations regarding this. 
Hi, the matrix coefficients for the momentum equation are the same, so you have only one matrix. The source term has different values in each direction. Check lines 143208 in http://foam.sourceforge.net/docs/cpp/a04765_source.html
Regards. 
Quote:
After a long struggle, I just made a discretisation of momentum equation manully and found you are right, so I know why there was only one matrix.but I still have many problems so I didnot update this. While do you know why Ueqn.A() do not equal to the diag.term of Ueqn?http://www.cfdonline.com/Forums/ope...termueqn.html And why is this Ueqn looks so mass. Its not like a matrix. BTW, I read your note regarding to interFoam solve. Its totally wonderful and help me alot. Thanks for your answer about the momentum predictor. I need time to look it deeply, and I tried to download your thesis about several weeks ago but failed, can you send me one copy? Email:chivasbeijing@qq.com Regards! 
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