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32.4.4 Solve/Controls/Multi-Stage...

The Solve/Controls/Multi-Stage... menu item opens the Multi-Stage Parameters panel. It is available only when the density-based explicit solver is used.



Multi-Stage Parameters Panel


The Multi-Stage Parameters panel allows you to set parameters that govern the operation of the multi-stage solver. See Section  25.13 for details about the items below.

figure

Controls

Number of Stages   is the number of stages used in the multi-stage scheme. The default scheme is a 3-stage scheme with coefficients of 0.2075, 0.5915, and 1.0 for the first through third stages, respectively. Although the panel limits the maximum number of stages to five, you can define a scheme with an arbitrary number of stages with the solve/set/multi-stage text command.

Stage   labels the stage to which the parameters in the other columns apply.

Coefficient   sets the multi-stage coefficient for each stage. Coefficients should be greater than zero and less than one. The final stage should always have a coefficient of 1.

Dissipation   sets the stages for which artificial dissipation is evaluated. If a Dissipation box is selected for a particular stage, artificial dissipation will be updated on that stage. If not selected, artificial dissipation will remain "frozen'' at the value of the previous stage.

Viscous   sets the stages for which viscous stresses are evaluated. If a Viscous box is selected for a particular stage, viscous stresses will be updated on that stage. If not selected, viscous stresses will remain "frozen'' at the value of the previous stage. Viscous stresses should always be computed on the first stage, and successive evaluations will increase the "robustness'' of the solution process, but will also increase the expense (i.e., increase the CPU time per iteration). For steady problems, the final solution is independent of the stages on which viscous stresses are updated.

Default   sets the fields to their default values, as assigned by FLUENT. After execution, the Default button becomes the Reset button.

Reset   resets the fields to their most recently saved values (i.e., the values before Default was selected). After execution, the Reset button becomes the Default button.


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