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sushant April 9, 2009 02:52

Supersonic Flow over a Cavity (coodles): Maximum Iterations Exceeded
 
Hi,

I'm trying to solve a supersonic flow over a cavity using coodles, based on the pitzDaily case. My geometry looks like:

Code:

      ------------------------------------------------------
      |                                                    |
in -> |                                                    |  -> out
      |                                                    |
      ---------------                    ------------------
                    |                    |
                    |                    |
                    |                    |
                    -----------------------

Boundary Patches: inlet, outlet, upperWall, lowerWall (includes cavity)

Boundary Conditions:

      inlet                  outlet                  wall
U    Mach 3 (1050 m/s)      zeroGradient            no slip
P    1.4e5                  waveTransmissive        zeroGradient
T    288K                    zeroGradient            288K

I inevitably get the Maximum Number of Iterations Exceeded error if inlet velocity > Mach 1. I'm using adaptive timestep to keep Co < 1 but the solver still dies when the flow front just reaches the cavity. My thermophysicalProperties has:

Code:

thermoType      hThermo<pureMixture<constTransport<specieThermo<hConstThermo<perfectGas>>>>>;
mixture        air 1 28.9 1000 0 1.8e-05 0.7;

Initial conditions: U=0, P=1e5, T=288.

Ideas are much appreciated!

Thanks,
Sushant


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