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How to calculate relative velocities in impeller |
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April 3, 2024, 04:38 |
How to calculate relative velocities in impeller
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#1 |
Member
Pedro Gouveia
Join Date: Oct 2022
Location: Portugal
Posts: 63
Rep Power: 3 |
Hey everyone.
As a part of my Master's Thesis, I am performing a steady state MRF analysis in OpenFOAM V11. I want to compare the CFD data I retrieved with the experimental one on the paper. They have these plots of tangential and axial relative velocities and I don't know how I can obtain these values from openfoam. I know this has to do with the velocities triangles, but I don't know how I can perform this calculation: - c = u + w, where c is absolute velocity, u is circumferencial velocity and w is relative velocity. - now I need w_r and w_theta. How can I convert these in openfoam? Or maybe apply a formula in paraview calculator? I saw this function called fieldCoordinateSystemTransform, but I can't manage to use it. Should I put it in the control dict? Or create a file for it in the system folder? Preferably I would like to perform these transformations as a postprocessing and not in-run process, since I already have the simulations. Thank you very much, Pedro Gouveia |
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April 3, 2024, 06:15 |
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#2 | |
Member
Pedro Gouveia
Join Date: Oct 2022
Location: Portugal
Posts: 63
Rep Power: 3 |
Quote:
Hey guys, I just found out how to get the cylindrical velocities, at least for incompressible Fluid, in OpenFOAM v11. I don't know if it's the most correct way, but it's the only one I discovered. Put this line of code in the control dict, in the functions part: Code:
#includeFunc fieldAverage(cylindrical(U)) |
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