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 Unsteady Flow Past a Cylinder  Panel 

 Unsteady Flow Past a Cylinder  Panel 


Unsteady Flow Past a Cylinder
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Compared to the steady case, the unsteady case includes an additional timederivative term in the NavierStokes equations:
{latex} Wiki Markup 

Latex 

\begin{eqnarray}
\frac{\partial \vec{u}}{\partial t} + \rho (\vec{u}\cdot \triangledown)\vec{u} = \triangledown p + \mu \triangledown^{2} \vec{u}
\end{eqnarray}
{latex} 
The methods implemented by FLUENT to solve a time dependent system are very similar to those used in a steadystate case. In this case, the domain and boundary conditions will be the same as the Steady Flow Past a Cylinder. However, because this is a transient system, initial conditions at t=0 are required. To solve the system, we need to input the desired time range and time step into FLUENT. The program will then compute a solution for the first time step, iterating until convergence or a limit of iterations is reached, then will proceed to the next time step, "marching" through time until the end time is reached.
Go to Step 1: PreAnalysis & StartUp
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