y-plus

azmir

Hello!

In the user guide, it is written that a value of y-plus 30 to 100 is recommended. I have tried refining one of models and after refining my tetra model the y-plus value decreases into the range as recommended. Does this always mean that a decreasing y-plus value (by means of refining) mean a better calculation? And if so, why is there a lower limit of 30 in the recommendation? I have read published works that have y-plus of 0.1 or 2. How small should my y-plus be?

On another model which consists of super-fine all hexa mesh (hexa mesh cell size ~10 times smaller than my refined tetra mesh), the y-plus value is strangely high (max is around 100000) but the cell data for velocities (the results) look more logical compared to velocities from both of my tetra model.

Can someone help explain the meaning of y-plus caused by tetra/hexa mesh in relation with logical or actual results.