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Engineering
Mechanical Engineering
Estimating drag using only a temperature profile
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[QUOTE="boneh3ad, post: 5457051, member: 268837"] Off the top of my head, I can't think of any way this would work. There are still too many variables involved. It seems to me that the level of complexity required to use a temperature field as the initial conditions required to solve for the flow around a body essentially boils doing to doing a full DNS on the problem, and that is not currently an economical option for vehicle-sized problems (computational time scales with ##Re^3##). Trying to find a simpler way to convert temperature into drag other than through the governing equations doesn't seem feasible to me. That said, the reddit thread that you linked was basically asking if the temperature of the body could be measured in order to compute drag, which essentially boils down to asking if you can estimate drag based on the heat transfer into the body. This seems doubtful to me as well, since there are any number of ways that such heat transfer could occur that would result in different amounts of drag, e.g. turbulence occurring in different locations may result in the same net heat transfer without the same net drag. [/QUOTE]
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Estimating drag using only a temperature profile
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