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CFD is everywhere. Even though there are still some die-hard engineers using analytical methods, most are using computer simulations at different levels one way or another. Since CFD is used heavily in aerospace industries, you can include all of them. Even on satellite, you have to compute the flow field of the control thruster. Then, you have the jet engine companies and the power generation companies where the design of steam turbines and gas turbines are routinely done using CFD. Another place is the over-heating problem of CPU and computers, unless you are thinking about using hand calculations on the back of an envelope. What about the missiles of various kind, such as ICBM, hypersonic scramjet where you can not do without CFD. Then, there are pumps, fans and compressors for oil industries, heating and air conditioning. You also don't want to miss the F-1 racing cars. The application is endless in auto industries. So, in terms of CFD applications, the market is everywhere. It has no limit. Sometimes, you also need to include the computer hardware field. Anyway, if your definition is the companies selling the so-called commercial software, then you might be able to get the numbers directly from them faster. (do you include the engineers who run the code? I think you should, even though that's only small part of CFD.)
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