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Calculation of pressure forces in Fluent

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Old   June 27, 2007, 14:27
Default Calculation of pressure forces in Fluent
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Maharba
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Hi, I am trying to calculating the forces on a body due to pressure only on a body. Fluent gives an answer for a particular component (say x direction). However, When I try to calculate the same (by taking the pressure profile along the surface and multiplying it by the area and them extracting the x component of it), the resultant force seems to be much higher than what Fluent gives. Does anyone know how Fluent calculates this? IS there any additional things that I am missing? Thanks for your kind answers in advance. Mahar
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Old   June 28, 2007, 10:27
Default Re: Calculation of pressure forces in Fluent
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G'bli Gedook
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What type of surface? Did you perform an integration?
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Old   June 29, 2007, 01:14
Default Re: Calculation of pressure forces in Fluent
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Maharba
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Its a blunt body type geometry and I am performing an axisymmetric calculation. I perform a summation of the Fx component at each face along the boundary (F=P*A). I take the face normal of each boundary face (assuming a straight line between two nodal points) and resolve them into x and y components. For the area, I take the area of a trapezioid, which is what an axisym. annular section will result in. Please let me know if i am making any mistakes Thanks.
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