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torque calculation of impulse turbine

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Old   May 30, 2012, 01:34
Default torque calculation of impulse turbine
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Dear foamers

I created a case by combining the interDyMFoam (tutorials/multiphase/interDyMFoam/ras/damBreakWithObstacle) and pimpleDyMFoam (tutorials/incompressible/pimpleDyMFoam/propeller) to achieve the simulation of impulse turbine (multiphases flow and AMI). The screenshot of velocity field is shown in attachment containing three nozzles and a runner.
And now, I want to calculate the efficiency. A great issue comes out HOW can i obtain the torque (pressure and viscocity torque ) of runner. I have no idea about this issue. Any advice will be appreciated.
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File Type: jpg turbine.jpg (78.2 KB, 46 views)
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Old   May 30, 2012, 03:54
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Haven't got much of experience on this but… couldn't you just use a force calculation to computer the moment aruond the axis of rotation?
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Old   May 30, 2012, 20:44
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Now, I dont know how to report force in multiphase case. So i cant obtain torque without force. In singlephase case, the force/torque can be obtained by adding the following code in controlDict
type forces;
functionObjectLibs (""); //Lib to load
patches (sphere_region0); // change to your patch name
rhoName rhoInf;
rhoInf 1000; //Reference density for fluid
CofR (2 0 0); //Origin for moment calculations
outputControl timeStep;
outputInterval 1;
// rhoInf - reference density
// CofR - Centre of rotation
// dragDir - Direction of drag coefficient
// liftDir - Direction of lift coefficient
// pitchAxis - Pitching moment axis
// magUinf - free stream velocity magnitude
// lRef - reference length
// Aref - reference area
type forceCoeffs;
functionObjectLibs ("");
patches (sphere_region0);
rhoName rhoInf;
rhoInf 1000;
CofR (2 0 0);
liftDir (0 1 0);
dragDir (1 0 0);
pitchAxis (0 0 1);
magUInf 1e-7;
lRef 0.06; // sphere diameter
Aref 0.0014137; //1/2 * projected area = pi*r2/2

outputControl timeStep;
outputInterval 1;

more detail visit:
Forces in OF15

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