questions about SIMPLE algorithm (by Patankar)
Help me please....
I try to do some computer codes for SIMPLE algorithm by using equations in "Numerical Heat Transfer and Fluid Flow" by Suhas V. Patankar. But I'm confused with terms in this book. My questions are as following 1. From page 122, I need to solve eqs.(6.8) to (6.10). But I don't understand term "nb". Did they mean neighbors on nodes or CV faces? For an example, in equation (6.8), I have to submit u*nb to obtain u*e, did u*nb mean "uP and uE" or "up and ue" or "uP, uE, and ..."? 2. From page 101, I need to find coefficients in equation (5.62), do I have to use all parameter on the nodes or CV faces? For an example, to calculate aE, I have to use all parameter on "E"(node) or "e"(east CV face)? I hope there are some kind people feel free to help one stupid student. Thank you 
Re: questions about SIMPLE algorithm (by Patankar)
Hi:
you can see the precoded code instead of develope it by your self! I can help you if you need! ztdep@yahoo.com.cn 
Re: questions about SIMPLE algorithm (by Patankar)
Looking in Patankar, my takes is as follows:
2. Pg 101  scalar properties evaluated at cellcentre & cellcentres of neighbouring cells. 1. Pg 122 onwards refers to his 'staggered grid' concept for velocitydetermination. Refers to neighbours for staggered cells grid. To be honest, this method can make anyone become more than a little crosseyed. I have always seen the staggeredgrid technique as being a rather clumsy cludge. You may want to look into 'collocated methods' & alternative more direct procedures. In the end, the staggered grid tries to overcome a 'checkerboard' pressure grid, which is said to be a nonphysical solution. I don't currently happen to agree with Patankar & friends on that one. :) diaw... 
did you have the answer ?
I have the same questions about the neighbors coefficients with a staggered grid, did you get the answer?:(

?
Thank you for your answer. So, for the N neighbor the diffusion coefficient would be Gamma = (Gamma N + Gamma P)*0.5? I ask this because the middle of the face North (and south) for the staggered cell for e is not associated with the cell not staggered.
[IMG] http://thumbs.subefotos.com/4124e187...933985a90o.jpg[/IMG] In the image, yellow control volume is for v staggered grid and red for u. Diffusion terms are to be calculated in ew=P, ee=E, en=?, es=? Thank you for your answer 
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