How do I run a flow simulation in Solidworks using a surface model?

Im trying to run a flow simulation in solidworks using a surface model i created, however im getting an error and it wont let me do it. Do i need to convert the file type or something before it will work?

this is the model im trying to run the simulation on if that helps: Volkswagen Lupo

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Flow simulation unfortunately does not work with surface models. Surfaces have no mass and without mass a simulation won't be accurate. If you thicken/offset or sculpt the surfaces to make them even a really thin solid, it should then work.

 
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