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- - **What is the "dpdt" term?--chtMultiRegionFoam**
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What is the "dpdt" term?--chtMultiRegionFoamHi Foamers!
in the energy equation of the solver chtMultiRegionFoam, there is some code like following: fvScalarMatrix hEqn ( fvm::ddt(rho, h) + fvm::div(phi, h) - fvm::laplacian(turb.alphaEff(), h) == dpdt - (fvc::ddt(rho, K) + fvc::div(phi, K)) + rad.Sh(thermo) ); my questions are: 1, what does that "dpdt" means? :confused: 2, what does that "rad.Sh(thermo)" means? thank you guys, i am a really newbie in OpenFOAM.. Regards, Qing |

Hi,
1. You might want to look at the bottom of this page: http://www.openfoam.org/version2.2.0/thermophysical.php 2. This is the source term from the radiation. Hope that helps, Fumiya |

Quote:
for point 1, i read that part but i still dont unterstand the mathematical formula of the dpdt.. Is dpdt the "pressure-work term" and what it looks like? Or the dpdt is just a selector? for point 2, what is the mathematical formula of that source term? Does the "Sh" mean Sherwood number? So anyway, if someone can show me the complett mathematical equation of that energy equation code, that will be very nice..:p Best regards, Qing |

Hi,
1. In the pEqn.H(https://github.com/OpenFOAM/OpenFOAM...m/fluid/pEqn.H) Code:
`// Update pressure time derivative if needed` Code:
`Foam::tmp<Foam::fvScalarMatrix> Foam::radiation::radiationModel::Sh` Hope that helps, Fumiya |

Quote:
that s a wonderful answer, :D have a nice day! Regards, Qing |

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