[shock77]

Hi everyone,


can someone tell me a suitable way to calculate the total pressure and total temperature for compressible flow (supersonic)?


I have tried it this way in the controlDict for total pressure:

pressure1
    {
    type  pressure; 
    libs  ("libfieldFunctionObjects.so");        
    calcTotal yes;   
    calcCoeff no;
    
    writeControl    adjustableRunTime;
    writeInterval   5e-5;
    // Optional entries

    // Field names
    p               p;
    U               U;
    psi             psi;

    pRef 0;
     }


 probes1
    {
    
    type probes;

    functionObjectLibs ("libsampling.so");

    region region0;

    probeLocations
    (
    (100 50 50)
    );

    fields
    (
    U p T Ma rho total(p)
    );

        executeControl  writeTime;
        writeInterval   1;
    }

Unfortunately I get a different solution for the total pressure fields, when I use the calculator of paraview and calculate the total pressure with the Mach-Relations. The solution of total(p) is the one for incompressible flow. How do I calculate the total pressure for compressible (supersonic) flow?


And I have not found a way to calculate the total temperature. p0 and T0 are known variables in openFOAM, when you use the totalPressure or totalTemperature BC. So it should be somehow possible to access them, but I dont know how.




Kind regards,
shock77

[hbulus]

I am also waiting some thoughts on this issue.