Here is my re-work of your scene. I think it would be ok to scale up by 10, conduct the sim then scale down by 10 before outputting your final .bgeo.sc sequence. I basically started with one tire and prepared the white points without a FOREACH. Once I have the white points I delete the rest of the tire and add a polyextrude to create a thick patch. This tire patch is what gets fed into the fluid source, not the entire tire. I know it is not exactly the same but maybe it can help you out. You can still play with the wind tunnel, buoyancy as well as add curl noise to the velocity field. ap_OdForce_fluidSource_v01.hiplc
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