- **OpenFOAM Running, Solving & CFD**
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- - **The coefficient value for neighbouring cells **
(*http://www.cfd-online.com/Forums/openfoam-solving/60376-coefficient-value-neighbouring-cells.html*)

Hi,
The resulting algebraicHi,
The resulting algebraic equation for a general variable (phi) linking its value at the center of a control volume P with the values of neighbouring cells (n) are: A_p *Phi_p=Sum_n(A_n * Phi_n ) + S_(phi) with : A_p=Sum_n(A_n)+ S_p My question is: How can I get the coefficient A_n ? thanks for your help. best regards olivier |

Have a look at lduMatrix.H - tHave a look at lduMatrix.H - the member function you want is called diag()
Enjoy, Hrv |

HI Jasak,
I have some confuHI Jasak,
I have some confusion: I think that Ap is calculated in O.FOAM as: Ap=diag()/mesh.V(); and you said that A_n=diag() but in the theory Ap=Sum_n(A_n)+ S_p; how come ? thanks for your help. olivier |

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