27.8.1 Performing Yplus or Ystar Adaption

You will perform Yplus or Ystar adaption in the Yplus/Ystar Adaption dialog box (Figure  27.8.1).

Adapt $\rightarrow$ Yplus/Ystar...

Figure 27.8.1: The Yplus/Ystar Adaption Dialog Box

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

1.   In the Yplus/Ystar Adaption dialog box, 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.

4.   (optional) If you want to set any adaption options (described in Section  27.12), click on the Controls... button to open the Mesh Adaption Controls dialog box.

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  27.11.1), 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.