No div(u) in fvSchemes for basic/potentialFoam/cylinder tutorial?

gcengineer · August 7, 2013, 06:44

I'm trying to understand the fvSchemes dictionary.

According to the OpenFOAM Programmers Guide (p. P-42, http://foam.sourceforge.net/docs/Gui...mmersGuide.pdf), this tutorial solves a mass conservation equation (div(U) == 0) and a pressure equation (laplacian(1,p) == 0).

When I look at the fvSchemes dictionary for this problem, I see an entry for the pressure equation in laplacianSchemes, but I don't see an entry for the mass conservation equation in divSchemes.

Why is there no entry for div(U) in divSchemes?

Thanks.

gcengineer · August 10, 2013, 00:33

I am also trying to master fvSchemes and would appreciate any guidance on this question.

Thanks.

cfdonline2mohsen · August 10, 2013, 08:18

Dear gcengineer
Yeah you are right.
I remember that this tutorial has some problem and does not work.
Have a look at the following thesis about fvSchemes:

1996 Error analysis and estimation in the Finite Volume method with applications to fluid flows; Professor Hrvoje Jasak, PhD Thesis

2006 The Potential of Large Eddy Simulation for the Modeling of Wall Bounded Flows Eugene de Villiers, PhD Thesis

August 7, 2013, 06:44	No div(u) in fvSchemes for basic/potentialFoam/cylinder tutorial?	#1
gcengineer Member Glenn Carlson, PE, PhD (ret) Join Date: Oct 2012 Location: US Posts: 49 Rep Power: 13	I'm trying to understand the fvSchemes dictionary. According to the OpenFOAM Programmers Guide (p. P-42, http://foam.sourceforge.net/docs/Gui...mmersGuide.pdf), this tutorial solves a mass conservation equation (div(U) == 0) and a pressure equation (laplacian(1,p) == 0). When I look at the fvSchemes dictionary for this problem, I see an entry for the pressure equation in laplacianSchemes, but I don't see an entry for the mass conservation equation in divSchemes. Why is there no entry for div(U) in divSchemes? Thanks. ScarFace likes this.

August 10, 2013, 00:33	mastering fvSchemes in OpenFOAM	#2
gcengineer Member Glenn Carlson, PE, PhD (ret) Join Date: Oct 2012 Location: US Posts: 49 Rep Power: 13	I am also trying to master fvSchemes and would appreciate any guidance on this question. Thanks.

August 10, 2013, 08:18		#3
cfdonline2mohsen Senior Member Mohsen KiaMansouri Join Date: Jan 2010 Location: CFD Lab Posts: 118 Rep Power: 16	Dear gcengineer Yeah you are right. I remember that this tutorial has some problem and does not work. Have a look at the following thesis about fvSchemes: 1996 Error analysis and estimation in the Finite Volume method with applications to fluid flows; Professor Hrvoje Jasak, PhD Thesis 2006 The Potential of Large Eddy Simulation for the Modeling of Wall Bounded Flows Eugene de Villiers, PhD Thesis gcengineer and ScarFace like this. __________________ “If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.”

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