|March 10, 2005, 06:40||
AVL Fire transonic simulation
I'm doing a simulation of transonic flow through a nozzle. I would like to know the typical setting needed in AVL FIRE v8.2 for such a simulation. I have convergence for a combination of mass flow and pressure boundaries, but find it hard to achieve convergence for total/stagnation pressure as inlet and static pressure as outlet boundaries. I can only achieve convergence for very small inlet and outlet pressure differences, i.e. only for subsonic flow.
What would be the first thing I should do?
I have activated all the equations: momentum & energy. However I am unsure about compressibility options in AVL Fire. At the moment I am using compressible. Which between compressible and supersonic is the better choice?
What order of under-relaxation factors are typical to achieve convergence for transonic flow?
BTW, the nozzle I'm simulating is very small, about 3mm in diameter.
Is there a recommended differencing scheme & linear solver for transonic flows/this type of problem? I seem to remember MARS to work for some transonic simulations in Star-CD (is this correct?), does anyone know which of the schemes offered in AVL is similar to MARS?
Finally, is it possible for Fire to have a boundary surface which is sonic/supersonic? I know this is not good practise for Star-CD.
I'm new to CFD, so any insight(s) however small may be of help.
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