# C programming question eg simpleFoam

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 January 27, 2009, 08:57 Hi together, I am currently #1 New Member   Marc Wattenberg Join Date: Mar 2009 Posts: 3 Rep Power: 10 Hi together, I am currently working on understanding the basics of the solver code. I am a litte bit familar with programming, but do not understand e.g. UEqn().A() UEqn().H() mesh.Sf() etc For me its clear that some fuction A,H,AU... will act on the momentum equation, but where is the function defined. I already searched in the source guide but can not find A or H. I am sure someone can tell me the right procedure for understanding this Thanks a lot Marc

 January 27, 2009, 09:05 This is part of the PISO algor #2 Senior Member   Gavin Tabor Join Date: Mar 2009 Posts: 181 Rep Power: 10 This is part of the PISO algorithm. The momentum equation can be written as a_p U_p = H(U) - grad(p) for a point p. We need to be able to rearange this to solve it. .A() and .H() give access to the relevant components; roughly the diagonal of the matrix and the off-diagonal non-pressure components, respectively. .Sf() gives the face normal vectors IIRC Gavin

 January 27, 2009, 09:12 Thanks Gavin, but this was #3 New Member   Marc Wattenberg Join Date: Mar 2009 Posts: 3 Rep Power: 10 Thanks Gavin, but this was clear to me. I want to know where to find the definitions of A()... inside the code Marc

 January 27, 2009, 19:32 Dear Marc, Try rummaging ar #4 Senior Member   Gavin Tabor Join Date: Mar 2009 Posts: 181 Rep Power: 10 Dear Marc, Try rummaging around in OpenFOAM-1.5/src/finiteVolume/fvMatrices Gavin

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