RhieChow interpolation
1) I am trying to understand how to derivate the RhieChow interpolation. Does anybody has an electronic or hard copy of this paper:
Rhie, C. M. and Chow, W. L. (1983), "Numerical study of the turbulent flow past an airfoil with trailing edge separation", AIAA Journal, vol. 21, pp. 15251532, 1983. Please send it to bouloumag@gmail.com. 2) Is there any alternative method to RhieChow interpolation for nonstaggered grid system ? Thanks. 
have a look at:
Lien, F.S., Leschziner, M.A. (1994). A general nonorthogonal collocated finite volume algorithm for turbulent flow at all speeds incorporating secondmoment turbulencetransport closure, Part 1: computational implementation. Comput. Methods Appl. Mech. Eng. 114, 123–148. 
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i have not read the following book but it seems it uses another method which is not momentum interpolation and only geometric parameters are used.
"Introduction to computational Fluid Dynamics" by "Anil W. Date" 
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