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-   -   Jasak's Ueqn. (http://www.cfd-online.com/Forums/openfoam-programming-development/123541-jasaks-ueqn.html)

sharonyue September 15, 2013 22:44

Jasak's Ueqn.
 
Hi guys,

\begin{array}{l}
{a_p}{u_p} = \sum {{a_n}{u_n} - \nabla p,} \\
{a_p}{u_p} = \sum {{a_n}{u_n} - \int {\nabla p} dv} 
\end{array}

The first one in the famous Ueqn in Jasak's thesis. but isn't it should be the below one?

Thanks in advance.

Bernhard September 16, 2013 01:41

It would help if you give a more specific reference (i.e. equation number)

sharonyue September 16, 2013 04:15

Quote:

Originally Posted by sharonyue (Post 451907)
Hi guys,

\begin{array}{l}
{a_p}{u_p} = \sum {{a_n}{u_n} - \nabla p,} \\
{a_p}{u_p} = \sum {{a_n}{u_n} - \int {\nabla p} dv} 
\end{array}

The first one in the famous Ueqn in Jasak's thesis. but isn't it should be the below one?

Thanks in advance.

Quote:

Originally Posted by Bernhard (Post 451917)
It would help if you give a more specific reference (i.e. equation number)

Its in his Ph.D. thesis page 145, 3.136.
I think its not correct, it should be:
{a_p}{u_p} = \sum {{a_n}{u_n} - \nabla p_f}
While it does not matter..do you think so?

sharonyue September 23, 2013 10:20

my bad. \int {\nabla p} dv .................. \nabla p_f
Jasak is rite, its a kind of semi-discretised form of equation. the pressure gradient is not discretised at this stage.


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