SimCafe

Space shortcuts

Child pages
  • User Defined Functions - Numerical Solution

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 15 Next »

Unable to render {include} The included page could not be found.
Unable to render {include} The included page could not be found.

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 

Unknown macro: {latex}

\begin

Unknown macro: {eqnarray}

\phi = -psin(\theta)
\end


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.


Go to Step 6: Numerical Results
Go to all FLUENT Learning Modules

  • No labels