Hi @gcanfield, this is true for incompressible however I believe this is why you define a density in the forces and moment result control, so if for example, you calculate downforce generated from your car at ground level you define the air density to be approximately 1.225 kg/m^3 and this will produce the answer you seek.
I think to calculate a lift Coefficient you need to define a profile width and then using the coefficient, along with surface area, density, and velocity you can calculate lift. this works well for wings and profiles but not so well on entire car. Although you could use it on aerofoils on the car design. However, this still wouldn’t be my preference.
However, I will run a simulation this evening just to ensure that I’m correct.
- Are the results in a specific unit of measurement or are they just a numerical value for comparison?
Confirming with a simulation this evening I believe the unit is Newtons
- Is it possible to measure the amount of down force on each of the four wheels individually ?
Yes, create four forces and moments controls and assign them to all faces for each tyre individually.
@Ali_Arafat am I correct with units? it may be handy to include units on the plot and documentation?