analysis limit layer in wind tunnel

[luca.m]

Hello everyone,
I ask you for help on a problem, which has been haunting me for a month and I can't quite solve =(
I am doing a specilistic degree thesis that studies the trend of the limit layer in a wind tunnel for high performance cars.

I have the speed profile found experimentally and with a cfd analysis I should try to reproduce this trend.
by comparing the experimental data I noticed that with the simulation, through the use of prism layer, I can take well the height of the limit layer and the point of minimum speed, but the trend is very different from the experimental data (as illustrated in attachment).with the cfd I have an excessive loss of amount of motion.
to try to solve the problem I tried:
- different levels of turbulence intensity between 0.10% and 0.30%
- different models of turbulence (k-epsilon realible, k-omega-sst)
- Grid sensitivity increasing the number of cells in the area of interest
in all cases there was no significant change in speed. I've tried all of them.

Can you tell me or recommend a way to solve my problem?
Thank you.

 

[calacc]

Hello, luca! First of all, I wanted to congratulate you on the study you're doing. Then, as I am very interested in the speech, I ask you some details about it, I list it to you:

- Could you call the cp? It looks like a coefficient to my eye. . .
- how were experimental data obtained?
- What's the "pump"?

Thank you.