[Harshal]

Hello all,
I have recently undertaken a project in vehicle aerodynamics. I have already generated a mesh in ICEM and have simulated the flow in Fluent. Unfortunately, the 'scaled residuals' in Fluent are never steady and vary even after a large number of iterations. When I searched for a solution for this problem, I came across a post stating that for vehicle aerodynamics, a Y+ value of 40-50 while meshing is advisable, to get correct results.

My question is :
How can I implement the Y+ value in ICEM ? There are options in 'Prism' command like 'Height', 'Height ratio' etc. What should I input to get Y+ of 40 or 50 ?

Also, I tried to calculate the wall distance using the Y+ estimation calculator. I have given the velocity of car as 'Free stream velocity'. However, I am not sure about the 'Boundary Layer Length' option. What should I input there ? The car length ?

Thanks and Regards,

Harshal