Any Solidworks/Floworks Experts?

[Nitro_Junkie]

I'm modeling my third year Uni project (an undertray and diffuser for my dragster) in Solidworks and Floworks to test it

I run through the wizard to set it up, but when I run the solver I get
"It is possible to calculate internal task,when there are no sources defined, only when the "Heat conduction in solids" option is enabled."

I've tried setting boundary conditions but selecting a face to apply them to gives me
"Face <1> is not laying on the boundary between solid and fluid region."

I'm sure its something stupid and basic I'm missing (I'm new to the program)

If anyone could give me a step by step guide to the setup process for flow testing I'd be very grateful

Cheers

this is the part I'm designing (the diffuser)