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Is Your Solution Converged?
Posted Thu December 13, 2001 @08:10PM
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Solver In their latest newsletter, Fluent offers advice to engineers running CFD solutions on when to declare your solution converged.

The article covers the basics of solution convergence in a CFD simulation and discusses the level of convergence necessary for differing applications. For instance, a highly converged solution is required if you are examining minute details in the flow field as opposed to a case where you are simply looking for approximate flow features.

During the course of the iterative solution algorithm, the imbalance in each cell is a small, non-zero value that, under normal circumstances, decreases as the solution progresses. This imbalance is called the residual.
The article also describes some ways in which the solution convergence can be monitored. These include plots of the total residual, integrated quantities at surfaces (such as mass flow rate), and derived quantities, such as the drag coefficient.

In conclusion the article points out that solution convergence is only one part of overall simulation accuracy.

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