Recent content by MaxKang

Thank you so much!

Hello everyone, I am working on a 3.2 meter wing span electric aircraft with another group of 30 engineering students. In calculating the induced drag and lift for preliminary calcs I am a little confused as to whether I need to include the width of the fuselage in the wing span(b) for induced...

Because there seems to be a lot of room for error in doing CFD, in fact since we need to simulate the rotational flow due to props the result might be highly unreliable. Quite a few of the Master students at my university seemed to ignore CFD and go straight to a wind tunnel testing. Once time I...

Hello, me and other engineering students at my university are designing an electric aircraft and we are hoping to implement the technology that NASA is currently working on, http://www.nasa.gov/press-release/nasa-electric-research-plane-gets-x-number-new-name Basically how it works is you have...

"An adverse pressure gradient strongly favors transition to turbulent flow. In contrast, strong favorable pressure gradients (where p decreases in the downstream direction) tend to preserve initially laminar flow." "High values of M∞ and low values of Re tend to encourage laminar flow" Looking at...

Do all airfoils(infinite wing) have a flow separation at a finite or zero AOA? I wonder if there exists such an airfoil that despite the presence of adverse pressure gradients, exhibits no flow separation phenomena, perhaps turbulent intensity could be high enough to sustain enough speed near...

Thank you!

Thank you so much for the inputs djpailo and boneh3ad... There are quite a number of new terms that I have not come across before. I think it will take a while for me to go through the books that djpailo recommended. Would you guys say a Mechanical Engineering student who has not yet taken the...

A lot of intro aerodynamics books seemed to suggest that the shear stress acts only tangential to the surface. Then, are we technically ignoring the contribution of the normal viscous stress in calculating the aerodynamic force on a body? Even when we have dilation of fluid particles, I believe...

Hello, I came to know that a normal component of the viscous stress can exist at a solid surface for unsteady, compressible flows(though even in that case, the normal component of the viscous stress is typically much smaller than the tangential component). I tried googling it myself but could...

Thank you so much! I will read up on it :)

Hello everyone, I came across this in J. Anderson's book "Fundamentals of Aerodynamics". "For the type of gases and liquids of interest in aerodynamic applications, the value of the shear stress at a point on a streamline is proportional to the spatial rate of change of velocity normal to the...

But we still should be able to sense how "cold" or "hot" it feels to be in that environment should we not? Does the quantum theory predict that we will indeed feel cold in an environment where there is only a very little amount of molecules?

I think this is because thermal energy indeed IS a sum of internal kinetic energies(rotational, translational, vibrational, etc).. So I guess in a way, the kinetic energy of a molecule(microscopic scale) can be thought of as thermal energy. I think I will be free of doubt if someone can explain...

Thank you so much for the reply ! :) I think I need to dig into more books to understand the mechanism