Hi,
I'm wondering how one ca
Hi,
I'm wondering how one can solve systems of equations in OpenFOAM. I am not interested in a segregated solver of the PISO, SIMLE type, since I have source terms. Does one have to construct a vector containing the unknowns, e.g. U=(rho, rho*u, rho*v, rho*w, rho*E) for the NSequations. And then do the time integration with some scheme, e.g. RungeKutta or similar. Will there be problems with the physical units? What about the operators, div, grad, etc. can they handle this? What other difficulties can you foresee? Is this a feasible way at all with OpenFOAM? best regards Marco 
Why cant you use a segregated
Why cant you use a segregated solver with source terms like the rest of us? OpenFOAM does not at present incorporate a block solver, so you are limited to a segregated approach.
To see how equations are defined and solved, please look at any solver's top level code, e.g. RANS based incompressible solver, OpenFOAM1.0.2/applications/solvers/incompressible/turbFoam/turbFoam.C 
For this case, the segregated
For this case, the segregated solver is not appropriate  you get killed in crossequation coupling because sourcecoupling is very strong. We basically need a block solver and the sooner the better.
If you try to solve this segregated, you will end up violating the entrophy condition because of lagged source interaction. Hrv 
We have very successful segre
We have very successful segregated solvers for this kind of problem, it's just a matter of choosing the best variables to solve for and being consistent with the discretisation and boundary conditions.

All times are GMT 4. The time now is 05:41. 