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- - **Unsteady kE with scalar transport - Outlet-geometry heavely effects scalar transport**
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Unsteady kE with scalar transport - Outlet-geometry heavely effects scalar transport5 Attachment(s)
Hi OpenFoamers,
I have a problem getting my custom OpenFOAM solver to transport scalar specie to the outlet! I have tried several things: 1. It works with steadyState kE, solution converges and scalar is trasported. 2. It works as unsteady - if the outlet is a Ø80 tube and a pressure condition at the end! (no big opening) 3. I have tried symmetry BC, outletInlet BC and pressure Outlet BC for a square box 4. I have tried pressure Outlet BC for a half sphere. 5. I dont know why, but I have seen new variables in the time-folders U_0 and scalar_0 - why is there suddenly thees parallel files? 6. Residuals for specie are 1E-5 7. The falty solution seems to be caused by my outlet? My custom code is like this: fvScalarMatrix CH4Eqn ( fvm::ddt(CH4) +fvm::div(phi, CH4) - fvm::laplacian(turbulence->nut()/0.7,CH4) ); CH4Eqn.solve(); I use QUICK scheme for div and Euler for timestep. I have attached jpegs of the current solutions. Any suggestions? BR Christian |

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