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26.5.1 Dynamic Gradient Adaption Approach

The dynamic gradient adaption executes the gradient adaption automatically. Though all options of gradient adaption are valid for the dynamic gradient adaption, some specific settings are recommended:

In the Gradient Adaption Panel

In the Gradient Adaption Controls Panel

Examples of Dynamic Gradient Adaption

Example 1: Steady state problem.

Consider a supersonic flow over the blunt body. To determine the wave drag for such problem, first resolve the shock wave. Start with a coarse mesh and setup dynamic adaption. As you start iterating the solution, the solver will produce a blurred shock, probably in an incorrect location. After the adaptions, the shock will become sharper and move into the correct location.

Example 2: Time dependent problem.

Consider a traveling shock wave. To determine the precise pressure amplitudes and arrival times at a number of locations, you need to resolve the shock wave over the time, so that you can maintain the correct shock strength and its location. Dynamic adaption is efficient in this case, as it refines the mesh near the shock and at the same time it coarsens the mesh wherever needed.

See also Tutorial 4 for an example of applying dynamic gradient adaption to a FLUENT simulation.

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