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26.9.2 Performing Yplus or Ystar Adaption

You will perform Yplus or Ystar adaption in the Yplus/Ystar Adaption panel (Figure  26.9.3).

Adapt $\rightarrow$ Yplus/Ystar...

Figure 26.9.3: The Yplus/Ystar Adaption Panel

The procedure for performing $y^+$ or $y^*$ adaption is as follows:

1.   In the Yplus/Ystar Adaption panel, select Yplus or Ystar as the adaption Type.

(a)   Select Yplus if you are using the enhanced wall treatment.

(b)   If you are using wall functions, you can select either type.

2.   Choose the wall zones for which you want boundary cells to be marked or adapted in the Wall Zones list, and click on Compute to update the Min and Max fields. The values displayed are the minimum and maximum values for all wall zones, not just of those selected.

3.   Set the Min Allowed and Max Allowed. Cells with $y^+$ or $y^*$ values below Min Allowed will be coarsened or marked for coarsening, and cells with $y^+$ or $y^*$ values above Max Allowed will be refined or marked for refinement.

Note:   If you are using the default hanging node adaption, you will not be able to create a grid that is coarser than the original grid. For this, you must use conformal adaption that is conformal coarsening which is only available for 2D or axisymmetric geometries. See Section  26.12 for details.

4.   (optional) If you want to set any adaption options (described in Section  26.12), click on the Controls... button to open the Grid Adaption Controls panel.

5.   Click Mark to mark the cells for adaption (refinement/coarsening) by placing them in an adaption register (which can be manipulated as described in Section  26.11.1), or click Adapt to perform the adaption immediately.

To disable refinement or coarsening, or marking for refinement or coarsening, turn off the Refine or Coarsen option before marking or adapting.

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