Finite volume methods, reconstruction, etc. -- CFD Online Discussion Forums

January 23, 2012, 11:08	Finite volume methods, reconstruction, etc.	#1
Nereus New Member Nereus Join Date: Sep 2011 Posts: 18 Rep Power: 14	Hi: I have a question about finite volume methods, specifically regarding the calculation of fluxes at control volume faces. The books I have read devote a lot of time to discuss the reconstruction of scalar variable at these faces. For example, the reconstruction of $U_{i+1/2}$ . Then, it is usually stated that we can calculate the flux, $F_{i+1/2}=F(U_{i+1/2})$ , and everything is peachy. I understand the reconstruction of $U_{i+1/2}$ , but what confuses me is if, for instance, I'm considering an advective flux, what velocity do I use with the reconstructed variable at to get my flux? A simple average velocity at the control face? In short, do I also have to go through the reconstruction process that I used for the scalar variable for the velocity vector?

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