HELPP!!! CFD for FSAE race car

djstoneage · April 7, 2009, 17:13

Hi all

I am in the process of running cfd for formula SAE car. ICEM CFD was used to compute the mesh. and fluent as a solver.

i am getting a very high drag convergence history value. can anyone advice?

my setup is a car in a control volume box. i am also getting a lot of reverse flow.

also if anyone can recommend boundary condition setup that will be very helpful

chyn

jntan · April 7, 2009, 19:21

Check your grids/mesh. This could be the most possible cause of the high drag since you use the SAE formula car model.

Here're my two cents to contribute:

1. Cross section area ratio of the vehicle and the computational domain/virtual wind tunnel (<10% is good).

2. The size of the girds close to the surface of the vehicle.

3. The ground boundary layer effect.

4. The accuracy of your solver software package.

5. Boundary settings and numerical model you use.

Good luck!

April 7, 2009, 17:13	HELPP!!! CFD for FSAE race car	#1
djstoneage New Member chyn wey lee Join Date: Apr 2009 Posts: 22 Rep Power: 6	Hi all I am in the process of running cfd for formula SAE car. ICEM CFD was used to compute the mesh. and fluent as a solver. i am getting a very high drag convergence history value. can anyone advice? my setup is a car in a control volume box. i am also getting a lot of reverse flow. also if anyone can recommend boundary condition setup that will be very helpful chyn

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April 7, 2009, 19:21		#2
jntan New Member Jiannan Join Date: Mar 2009 Posts: 10 Rep Power: 6	Check your grids/mesh. This could be the most possible cause of the high drag since you use the SAE formula car model. Here're my two cents to contribute: 1. Cross section area ratio of the vehicle and the computational domain/virtual wind tunnel (<10% is good). 2. The size of the girds close to the surface of the vehicle. 3. The ground boundary layer effect. 4. The accuracy of your solver software package. 5. Boundary settings and numerical model you use. Good luck!