Power draw of a mixer
my goal is to evaluate the power draw of a mixer (mixer3D) via the integration of the forces acting on the moving or non-moving parts over the relevant patch.
I am an absolute Newbie in OpenFOAM and threw together some Code from the wallShearStree, wallGradU, patchIntegrate utilities and some things i read in the forum.
I try to get the velocity gradient with
Now i want to integrate tau over the faces of the patch, or not?
Can someone give me a hint how i bring this "element" into my code? Or point me to a source where i can find the formula to calcualte the power draw via this method.
Thanks in advance.
welcome to this board...
You might want to have a look at
Handbook of Industrial Mixing (page 314)This should give a first approximate number (if one neglects the shear). Hope this helps.
Thank you .
Unfortunately I am stuck at the next phase. But now it is more a problem of the OpenFOAM Programming syntax i dont really geht.
I try to get torque by summing up the
Area of every Face * Pressure on that face * Distance to the Center (= lever arm)
My Syntax for that is
mag(pressure.boundaryField()[patchi][facei]) = pressure on that face?
pressure.mesh().boundary()[patchi].Cf()[facei] = The x-Coordinate of the Center of the face?
The results i get are to low by arround 1E-2 so i guess i have a missunderstanding in the Syntax of OpenFOAM, if someone could lighten me up i would be very grateful.
If somebody is interested:
I wrote a little Tool for turbulent flows which calculates the powerdraw from the Epsilon-Term,
P = rho * Integral(Epsilon dV)
I'm a beginner at OpenFOAM and I'd like some help if possible.
I have to calculate the circulation in a vortex. My code is as follows:
Thank you in advance!
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