[erikmath27]

Hello!

I'm a beginner in CFD and currently attempting to analyze an underwater vehicle for lift and drag coefficients.

I am struggling with meshing the vehicle. This question is mainly about inflation layers. I have opted for a target y+ of 1 as I understand it is important for drag and lift calculations. This gives a first layer thickness of 0.2mm. I have applied this together with a growth ratio of 1.2 and 40 maximum layers. At the front section of the vehicle, the layers look more like what I would want, but further aft they "squish" and become increasingly thin. At some locations, the total thickness is extremely thin and the resulting volume transition to the surrounding mesh is very poor.

What do you believe is the cause of this and what actions can I take to try to mitigate it?

I have attempted to change the first layer thickness, growth ratio and maximum number of layers, disable all other mesh settings and try to change the global mesh size. Nothing changes this phenomenon.

See images:
https://ibb.co/s5pGdMT
https://ibb.co/myr5YWd

Thank you,
Erik