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{include: FLUENT Google Analytics} {include: User Defined Functions - Panel} h1. Numerical Solution The strategy for computing the lift force using the UDF is as follows: 1. Turn on a 'user defined scaler' φ which Fluent will solve for 2. On the cylinder surface, set the below equation by implementing the UDF as a boundary condition for φ {latex}\begin{eqnarray} \phi = -psin(\theta) \end{eqnarray}{latex} 3. Run at least one iteration to integrate φ over the cylinder 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. \\ {html}<iframe width="600" height="338" src="//www.youtube.com/embed/RZAvenIhH_s?list=UU8bXUXdcNDyFTIp6YVrtReg" frameborder="0" allowfullscreen></iframe>{html} \\ [Go to Step 6: Numerical Results|SIMULATION:User Defined Functions - Numerical Results] [Go to all FLUENT Learning Modules|SIMULATION:FLUENT Learning Modules] |
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