Thank you for your reply.

Actually i'm not enough experienced on this field. And i don't get any supervision from my supervisor. So i don't get any guidance from anywhere. I'm not familiar with this term how reference values work.I just follow some youtube tutorial and doing the analysis as i don't have depth knowledge of 3D modeling.So i don't know why i facing the problem of inaccurate value of Cl.Can you help me to get rid of it which way should i go to solve this problem?