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Mechanical Engineering
Wind Tunnel -- initial testing speed?
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[QUOTE="Bispen, post: 5707722, member: 617334"] Hi bigfooted, Thanks for your participation. Our simulation is 3D one in OpenFoam, RANS wSST with wall function, maybe Low-Re if necessary. I have all the necessary hardware to compute this. My concern is not about the CFD environment but the physical and mathematical approach. The purpose is some performances analysis : to determine 1/ the optimum glide angle, 2/ the corresponding forward speed for this specific angle of attack/incidence, 3/ the stall speed if possible I know the weight, the altitude but playing around with mg,L,D,Cl,Cd,attack angle and incidence angle and all the curves found in the books I have (polar, drag polar, Cl/alpha, Cd/alpha, Cl/Cd, h/V...) I am still ending up with an unknown variable (either attack angle or speed). Lift varies according to alpha and speed. Same for total drag. And all is dependent from incidence angle. I suspect an iterative approach might be the only solution. I thought it would have been simpler. [URL]http://www.rjplancaster.net/documents/PrinciplesOfGliderFlight-LiftDragPerformance.pdf[/URL] [URL]http://www.free-online-private-pilot-ground-school.com/Aerodynamics_in_flight.html[/URL] [URL]http://www.langleyflyingschool.com/Pages/CPGS+4+Aerodynamics+and+Theory+of+Flight+Part+1.html[/URL] [URL]http://www.skybrary.aero/index.php/Drag[/URL] [URL]http://www.pilotfriend.com/training/flight_training/aero/drag.htm[/URL] [URL]https://www.grc.nasa.gov/WWW/K-12/airplane/bga.html[/URL] [/QUOTE]
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Wind Tunnel -- initial testing speed?
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