grid independence
 

hallo, right now i simulate a Fan-modell and i just want to finish the grid independence study. but i dont know if i must do the same improvement for the prism layer and the core mesh. Or i just need do it for the core mesh.

When you keep the prism layer thickness the same, you will end up with cells with bad aspect ratios. When you don't keep the prism layer thickness, you will end up with a different mesh topology. So there's no "right" solution.
Anyway, I would adjust the prism layer thickness to make a good mesh. Your prism layers should be reasonable in terms of number of layers and transition to the core mesh, then it shouldn't harm to change all by the same factor.

thanks for your advice. the same words i have told my tutor. but he asks anyhow for the reasons- why i dont or do improve the qualtiy of prism layer. could you just tell me where i can find some literature that i can quote as evidence or what.

thanks for your advice. the same words i have told my tutor. but he asks anyhow for the reasons- why i dont or do improve the qualtiy of prism layer. could you just tell me where i can find some literature that i can quote as evidence or what