# First order upwind on collocated grid arrangement

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 July 13, 2010, 07:15 First order upwind on collocated grid arrangement #1 Senior Member   Join Date: Jun 2010 Posts: 103 Rep Power: 7 Hi all, Please help!! I need to know what happens to the mass fluxes if first order upwind was used on collocated grid arrangement. I have: A_W=-max(mdot_w,0) A_E=-max(mdot_e,0) A_P=a_p + max(mdot_e,0)+max(-mdot_w,0) I would appreciate an explanation. Please help as soon as possible I have posted a similar question previously and received no responce and I am unable to find references that explains this. Thank you very much in advance.

July 13, 2010, 08:46
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 Originally Posted by Hooman Hi all, Please help!! I need to know what happens to the mass fluxes if first order upwind was used on collocated grid arrangement. I have: A_W=-max(mdot_w,0) A_E=-max(mdot_e,0) A_P=a_p + max(mdot_e,0)+max(-mdot_w,0) I would appreciate an explanation. Please help as soon as possible I have posted a similar question previously and received no responce and I am unable to find references that explains this. Thank you very much in advance.
A_W = -maximum(mdot_w, 0.0). If mdot_w < 0, then A_W = 0. If mdot_w > 0, then A_W = -mdot_w. A similar treatment holds for A_E and A_P. MAX(A,B) is simply a mathematical function that takes on the maximum value of the arguments in the argument list.

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