CFD Online Discussion Forums - Pressure Driven Supersonic Flow in Coverging-Diverging Nozzle (Wind Tunnel)

I have been trying to run this Mach 2.5 supersonic nozzle through OpenFoam and can't seem to figure out the correct boundary conditions. For reference, this is a nozzle that is attached to the 15cm x 15cm supersonic wind tunnel at NASA GRC.

Boundary conditions are:

Temp = 520 R
Inlet: Total Pressure = 34.6 PSI
Outlet: Static Pressure = 1.78 PSI

After trying out a large number of combinations of boundary conditions (read as 50+), this following one seems to work the best:

Pressure, p

Code:

{

internalField   uniform 238559;



boundaryField

    inlet

    {

        type            totalPressure;

        gamma           1.4;

        p0              uniform 238559;

        value           $internalField;

    }

    outlet

    {

        type            waveTransmissive;

        gamma           1.4;

        fieldInf        12272.7;

        lInf            0.005;

        value           uniform 12272.7;

    }

    nozzle

    {

        type            zeroGradient;

    }

}

Temperature, T

Code:

{

    inlet

    {

        type            fixedValue;

        value           uniform 348.432;

    }

    outlet

    {

        type            zeroGradient;

    }

    nozzle

    {

        type            zeroGradient;

    }

}

Velocity, U
(changing the wall condition from slip to noSlip seems to not make a big difference with the centerline velocity)

Code:

{

    inlet

    {

        type            zeroGradient;

    }

    outlet

    {

        type            zeroGradient;

    }

    nozzle

    {

        type            noSlip;

    }

}

I get an outlet centerline velocity of around 630m/s or about Mach 1.83, which is definitely not correct. Do any of you guys have any suggestions as to what is wrong and why I am not getting Mach 2.5? Also, why do I have to use waveTransmissive instead of fixedValue for the outlet pressure? If I use fixedValue, I get a huge velocity discontinuity at the outlet.

My case file exceeds the attachment limit, so I have, instead, put them in my Google Drive, accessible here: https://drive.google.com/open?id=1YQ...T9sU9mh8mpQw8h

Thanks in advance for the help. I have been staring at this for the past 2 weeks, making little progress if any, albeit learning a lot about OpenFoam.