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- - **energy equation in rhoCentralFoam**
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energy equation in rhoCentralFoamHi,
I have a few questions on the formulation of energy equation in rhoCentralFoam. In the source code, the energy equation looks like this: 00176 solve 00177 ( 00178 fvm::ddt(rhoE) 00179 + fvc::div(phiEp) 00180 - fvc::div(sigmaDotU) 00181 ); 00182 00183 e = rhoE/rho - 0.5*magSqr(U); 00184 e.correctBoundaryConditions(); 00185 thermo.correct(); 00186 rhoE.boundaryField() = 00187 rho.boundaryField()* 00188 ( 00189 e.boundaryField() + 0.5*magSqr(U.boundaryField()) 00190 ); 00191 00192 if (!inviscid) 00193 { 00194 volScalarField k("k", thermo.Cp()*mu/Pr); 00195 solve 00196 ( 00197 fvm::ddt(rho, e) - fvc::ddt(rho, e) 00198 - fvm::laplacian(thermo.alpha(), e) 00199 + fvc::laplacian(thermo.alpha(), e) 00200 - fvc::laplacian(k, T) 00201 ); 00202 thermo.correct(); 00203 rhoE = rho*(e + 0.5*magSqr(U)); 00204 } 1. Why is the viscous term "sigmaDotU" included in the inviscid equation? 2. I think I understand the heat conduction in line 200. What kind of conduction of internal energy is in lines 198-199 ? 3. What is the use of the repeated use of fvm and fvc discretisation of the same expressions in lines 197-199? Why is it not applied to the heat conduction in line 200? 4. Where is the pressure term Dp/Dt? I'd be glad if anybody could help me in understanding this issue. |

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