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Numerical Solution
The strategy for computing the lift force using the UDF is as follows:
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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
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{latex}\begin{eqnarray}
\phi = -psin(\theta)
\end{eqnarray}{latex} |
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3.
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Run
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at
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least
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one
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iteration
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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
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to
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get
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the
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normalized
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side
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force.
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This
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is
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because
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when
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you
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integrate
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liftFunc,
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you
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get
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the
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integral
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of
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-p*sin(theta)
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on
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the
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chosen
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surfaces.
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User-defined
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function
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implementation
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to
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obtain
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the
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lift
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coefficient
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around
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the
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cylinder
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is
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as
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follows.
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