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25.17 Performing Time-Dependent Calculations

FLUENT can solve the conservation equations in a time-dependent manner, to simulate a wide variety of time-dependent phenomena, such as

Figures  25.17.1 and 25.17.2 illustrate the time-dependent vortex shedding flow pattern in the wake of a cylinder.

Figure 25.17.1: Time-Dependent Calculation of Vortex Shedding ( $t$=3.66 sec)
figure

Figure 25.17.2: Time-Dependent Calculation of Vortex Shedding ( $t$=41.6 sec)
figure

Activating time dependence is sometimes useful when attempting to solve steady-state problems which tend toward instability (e.g., natural convection problems in which the Rayleigh number is close to the transition region). It is possible in many cases to reach a steady-state solution by integrating the time-dependent equations.

See Section  25.3.2 for details about temporal discretization.




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