Vehicle Aerodynamics
I carried over simulation of air flow over a flat plate for turbulent boundary conditions and found the drag acting on the plate to be 2.1 N(approx.). I wish to extend the problem to the analysis of flow over a car's roof. It is understood that for a car's sunroof (of the same dimensions) the drag acting is 2.1N but can I infer from this that when the sunroof is open the drag force acting on the car increases by 2.1 N ?
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What I mean is that I read from somewhere that Cd of a car increases from 0.32 to 0.41 when sunroof is opened. Calculations with the analytical formulas using these values shows an increment of over 100N in drag force. Really confused??
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As far as I know, flat plate drag predictions do not correlate with the drag on a car's roof. The only aspect that may correlate is skin friction drag, which is by no means the whole story. In order to properly estimate the drag of a car, the flow over the entire car and a large surrounding volume must be solved.
If you could provide more detailed information about the problem, I may be able to guide you a little more precisely. -Zachariah |
The problem is that I wish to find the effects of car's sunroof being open or closed on fuel economy and therefore I tried to find the drag acting on a car with and without sunroof. Is it possible by analysing drag only on sunroof?
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porous wall
I have a question of how can I simulate the cylinder with porous wall and solve fore concentration gradients, and what is the best software for.
thank you in advance I dont know if its the correct place to post this!! |
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Yes, it'll massively change your wake, thus the forces acting on your car.
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