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Using Simscale i used some beginner CFD in this, crreating velocity profile of wind and pressure distribution

In-compressible flow simulation for aerodynamic studies, using SimScale Standard mesh algorithm

Tutorial on incompressible flow simulation for aerodynamics studies, using SimScale Standard mesh algorighm.

Designing some aerodynamic parts for my Mitsubishi Lancer Evolution 5 to boost grip performance in Time Attack. CFD

Here is a incompressible analysis for  a car spoiler

Tutorial project for setting up the mesh using Hex-dominant automatic for external flow.

finding the flow pattern behind the spoiler

The project goal is to check what changes to stock rear end flow do different spoilers(don't confuse with wings).
As the spoiler job is to spoil the air, while in comparison wings are deflecting it.
Tests were performed at 35m/s and there are several cases.
As we look at coefficients we can notice that plain rear end have tendency to lift up the vehicle which increases overall drag.
Lip and 3000 are creating small air pocket which decreases lift thus releases vehicle from additional drag.
However, it creates a bigger wake region at the end, so 3000 by having open space at lower parts purges some of the stagnant air maintaining a smaller wake region, we can see similar tendencies in Lip and TrapezLip which is in offset. Being offset gives advantage of not staying in the path of direct airflow so wake region stays similar to plain rear end.
The project is not finished yet, feel free to check results.

Testing to see the aero effects of a rear spoiler on a volvo wagon

spoiler | SimScale Project Library | Page 1