# Something not clear for me in Jasak's thesys

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 June 20, 2007, 03:53 Something not clear for me in Jasak's thesys #1 Lam Guest   Posts: n/a Hi all, I've read the thesys of Jasak. And in the part 3.8, when he speaks about the semi-discretized form of the momentum equation, I wonder where the "laplacian(nu,Grad(U))" is. Because, he says: a_p*U_p=H(U)-Grad(p), where H(U)=-sum[a_n*U_n]+U0/deltaT and div(UU)=a_p*U_p + sum[a_n*U_n] First I guess that laplacian(nu,Grad(U))=a_p * U_p + U0/deltaT But I'm quite not sure. Hope that somebody can tell me where the laplacian(nu,Grad(U)) term is, in the discretized form. Thanks in advance, Lam

 June 20, 2007, 06:16 Re: Something not clear for me in Jasak's thesys #2 Hrvoje Jasak Guest   Posts: n/a Read it again: laplacian(nu,Grad(U)) also lives in a_p*U_p + sum[a_n*U_n], just like the convectin term - this is described in the discretisation chapter. Hrv

 June 20, 2007, 06:38 Re: Something not clear for me in Jasak's thesys #3 Lam Guest   Posts: n/a thanks to replying me. Now it's clear. But I just have an other question: what are the a_p and a_n coefficients in your thesis? I guess that they are a mixt between the Flux and the V_p and V_N. But it'svery not cleasr for me. Thanks in advance, Lam

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