# Convective Schemes how are they implemented

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 February 28, 2008, 11:44 Dear OF users and developers, #1 New Member   nicasch Join Date: Mar 2009 Posts: 23 Rep Power: 9 Dear OF users and developers, I would be very grateful if anyone could please provide some insight into the following divSchemes: - Gauss limitedLinearV - Gauss interfaceCompression. I suppose that they do some kind of blending based on the blending factor (limiter) calculated according to the scheme used. Is this blending between linear UD and CD or something else? I found a post containing the following: Φf =ΦC +(xf – xC) *ψ(rf) * (dΦ/ dx)f Or Φf =ΦC +(xf – xC) / (xD– xC) *ψ(rf) * (ΦD-ΦC) f ,the face C,central node D downwind node ψ(rf) the flux limiter rf is based on the following formula rf=(ΦC-ΦU)/( ΦD-ΦC) = 2*grad(ΦC)*(xD-xC) /( ΦD-ΦC) -1 I get bit confused while trying to read the code, is there any written text about these two schemes, or can someone please explain how they work? In limitedLinearV, I suppose that it is a kind of limited CD, but how is the scheme limited? Where is the limiter for this scheme used? Is the limiter function phi(r) used in calculation of the face value using adjacent cell-center values (like normal CD), or is it a blending between linear upwind and CD? For the interfaceCompression scheme I suppose that it is some blending based on the blending factor calculated according to the either quartic or quadratic formula. Where is the limiter for this scheme used? Many thanks in advance, best regards.

 November 4, 2010, 09:47 #2 Senior Member     Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 430 Rep Power: 16 Nicasch, have you finally found an explanation for interfaceCompression scheme? I'm struggling with the same question. Regards __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar

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