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- - **Understanding implemented PISO **
(*https://www.cfd-online.com/Forums/openfoam-solving/60339-understanding-implemented-piso.html*)

hi,
does anybody know why thi,
does anybody know why the flux in the icoFoam-case is calculated as it is? there are lines like that: volScalarField A=UEqn.A(); U=UEqn.H()/A; phi=(fvc::interpolate(U+UphiCoeff*fvc::ddt0(U)/A,"interpolate((H(U)|A(U))")&mesh .Sf())-UphiCoeff*fvc::interpolate(1/A)*fvc::ddt0(phi); where phi itself is "linearinterpolate(U)&mesh.Sf()" i know that i need a div-term for the pressure-eqn but what are these other terms in the phi-calculation? for me it looks like adding something in the interpolation and than substracting the same after interpolation. Am i right, that ddt0(U) gives the old-time-value for U in discretizised form (with coefficient)? I hope somebody can explain what happens here. thanks in advance stephan |

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