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FLow simulation on surfaces Problems (Beginner)

Wessel Holtslag

New member
Hello there, I made my first sketch of a car I liked! This is the first real project I began so I probably made a lot of mistakes, you can give me tips if you like.
My sketch is made out of surfaces and for a flow simulation you need a solid. However I can not make the surfaces a solid. The "Knit surface" feature is something I can not seem to get working and the "Thicken" feature is not always able to thicken a surface so I am kind of stuck.
Here is the link to my project: https://drive.google.com/open?id=1eHh79BM4QBm-6DS0AxS4ThEnVq_wuBCu
Could someone help me?
Thank you in advance!