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samiamandyesican / 497R

FLOW Lab Research Spring-Summer
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3. Explore & discuss the effects of wing aspect ratio vs wing efficiency. #13

Open samiamandyesican opened 1 month ago

samiamandyesican commented 1 month ago
samiamandyesican commented 3 weeks ago

I have a couple of ideas, but I'm not sure the best direction to go with calculating wing efficiency.

samiamandyesican commented 2 weeks ago

@Cardoza2 Is there another way to extract the lift/drag from the coefficients produced by VortexLattice since I don't know what $\rho$ or $V_{\infty}$ are?

Cardoza2 commented 2 weeks ago

Without $V_\infty$ or $\rho$, it is impossible to get the actual lift and drag from the coefficients. Look at the definition of the lift coefficient. It is defined with the freestream velocity and the density.

Taking a look at the docs for VortexLattice, Vinf appears to be the freestream velocity, which the user defines... so you should have that.

The density is a little more difficult. I had to look inside the source code to see what was going on. They were dimensionalizing by a constant RHO, which they define on the main file (VortexLattice.jl). 

# value for dimensionalizing, included just for clarity in the algorithms
const RHO = 1.0

In my opinion they should just have it be an optional argument, then they can define it to be whatever they want... but yeah. The code is using 1.0.