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separate positive and negative forces on surface

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Old   December 5, 2017, 11:15
Default separate positive and negative forces on surface
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Xavation
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Dear members,

My model consist of a simple rectangular vehicle, which is simulated using Ansys Fluent. The data can be exported to Paraview of CFD Post. I would like to obtain the positive and negative pressure forces (so suction force and pressure force) in x, y and z direction. Thusfar, I only obtained the total pressure force, per surface for the 3 directions, though I would like to separate this into the positive and negative values. Any suggestions how to do this?

All help is appriciated
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Old   December 5, 2017, 12:14
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Victor Casquero
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You could include some images of the model in question to illustrate the subject, it seems to me that what you need to visulate the pressure lines is just that, a map dento of the whole study volume of your model, I suppose that when modeling the car you included the domain around the car to model the aerodynamic resistance of the vehicle in motion, until someone more specialized in that software answer you can try to find some tutorial material on how to add these representations to the postoprocessing section of your model.
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Old   December 5, 2017, 12:30
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Ravindra Shende
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There is no ready-made filter in Paraview to do that, so you will have to write your own script to do that.
Its same as creating your own custom filter.
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Old   December 5, 2017, 12:32
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Filippo Maria Denaro
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Use the definition of the integral over the body and then project along the normal and tangential directions https://www.grc.nasa.gov/www/k-12/airplane/presar.html
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