Sign-up for free online course on ANSYS simulations!Authors: Lara Backer and Rajesh Bhaskaran, Cornell University
Problem Specification
1. Pre-Analysis & Start-Up
2. Geometry
3. Mesh
4. Physics Setup
5. Numerical Solution
6. Numerical Results
7. Verification & Validation
Exercises
Comments
Numerical Solution
The user defined function from the Pre-Analysis section defines the lift function in C and defines the pressure and centroid of each face, then calculates the quantity called liftFunc, defined as
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\begin
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\phi = -psin(\theta)
\end
Once the user defined function is implemented, we can use liftFunc to integrate the specified user defined scalar over the entire specified surface. Note that the liftFunc UDF calculates a side force that is NOT normalized. So you'll have to divide the reported value by 0.5*rho*v^2*D*1 to get the normalized side force. This is because when you integrate liftFunc, you get the integral of -p*sin(theta) on the chosen surfaces.
User-defined function implementation to obtain the lift coefficient around the cylinder is as follows.
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