Bill, I think there is some confusion as the question asked about calculating the effect of a mast was sent by k6xn and a copy follows. I responded to him suggesting that he could us the common value
While intuitively obvious, it's also wrong. Oddly, there are lots of situations where the Cd of a round member is >1.0 (i.e. the drag area is larger than the projected flat plate area)..By the way, a
Yes Jim and I wish I could get my aerodynamics students to see it beyond that level of simplicity. Indeed the coefficient of drag will increase rapidly when there is boundary layer separation, which
That't the cool thing about that java calculator.. it does all the nice slow speed, low Re stuff, without you having to slog through figuring out what the Re is and looking up the Cd for the cylinder
Jim, Are you saying that the java calculator algorithm breaks down in that speed range (~60 mile/hour), or are you saying that the drag coefficient really does wander that much across the pipe diamet
The Cd really does change that much over that range. There's a big change in how the flow works in that range of 10,000<Re<1,000,000. Cd varies as a function of Re, which in turn scales as Windspeed
Jim The non-linear character of the numbers you have chosen are characteristics of the so-called "drag bucket." Note in the description of the calculator that the author has used a parabolic algorith