coefficients of navierstockes descritized equation
hello
i'm new in cfd and have a problem when we discrete momentum equation such as below, what are the coefficients? a_P* u_P=Σ(a_NB)* (u_NB)+(A_P)* (p_Pp_E )+(S_c)* (Δ∀_P) (a_P is the central node coefficient and a_NB is the Surrounding node coefficient, p is pressure, ...) thanks a lot 
check Patankar book, everything is given there...

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