# A question about Jasak's Phd thesis

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May 24, 2013, 00:51
A question about Jasak's Phd thesis
#1
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Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 832
Rep Power: 17
Hi guys,

In Jasak's thesis Page 144.It says: (see the image equation 1 2 3).I dont know how can I get equation 3 from equation 2.
AFAIK,in SIMPLE algorithm,I can get equations similarly(from eq.4 to eq.5).So back to Jasak's thesis , should it be equation 6?Where is the diffusion term in his thesis?

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 May 24, 2013, 08:40 #2 Senior Member   Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 16 Hi Forrest, I think that what Dr. Jasak means is that the convection term can be calculated from the sum of the flow times velocity at the faces, and that will result in a contribution to ap and the an's, how this contribution will be effectively calculated depends on the convection scheme that is used. Best Regards, Paulo

May 27, 2013, 00:19
#3
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Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 832
Rep Power: 17
Quote:
 Originally Posted by vatavuk Hi Forrest, I think that what Dr. Jasak means is that the convection term can be calculated from the sum of the flow times velocity at the faces, and that will result in a contribution to ap and the an's, how this contribution will be effectively calculated depends on the convection scheme that is used. Best Regards, Paulo
Hi Paulo,

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 May 27, 2013, 07:36 #4 Senior Member   Paulo Vatavuk Join Date: Mar 2009 Location: Campinas, Brasil Posts: 196 Rep Power: 16 Hi Forrest, The diffusive term certainly have an influence that must be included in ap and the an's. The ap and the an's from equation 3 of your first post are not the same as the ones in the third eq of your second post. The equations 1, 2 and 3 of your first post are for an hypothetical situation for steady flow without diffusion and other sources. Best Regards, Paulo Last edited by vatavuk; May 28, 2013 at 07:17. Reason: small typos

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