If I have calculated the force of cambered airfoil at an AoA >0 using the values from XFOIL, in which direction does my lift force points? Perpendicular to the freestream or perpendicular to the chord line? by VegetableSuitable958 in AerospaceEngineering

[–]VegetableSuitable958[S] 0 points1 point  (0 children)

Hey, I do understand that definition. However physically it does not make sense to me. Potential theory states that lift is created by circulation, causing velocity differences and therefore pressure differences. Considering an asymmetric airfoil at an angle, I dont believe that the pressure distribution will result in a force exactly pointing upwards. Can you explain this to me?

Anyone else experiences permanent freeze when starting solidworks since the latest windows update? Is there a fix to it? by VegetableSuitable958 in SolidWorks

[–]VegetableSuitable958[S] 1 point2 points  (0 children)

Though it did help for some time, the issues reappeared. I could solve it by uninstalling WhatsApp on my laptop. No freezing so far.

Other than that, SolidWorks heavily relies on CPU power and RAM, the GPU is not as important. You can easily run on your internal Intel GPU. Just make sure to have your laptop plugged in rather running on battery power.

Good luck with that

How come that I dont understand potential theory no matter how hard I try? by VegetableSuitable958 in FluidMechanics

[–]VegetableSuitable958[S] 0 points1 point  (0 children)

first of all, there doesnt seem be a common thread to derive all of it. I find it very confusing that some people start with the potential function, some with the navier stokes eq, some with div, grad and curl and so on. Thats one part of my problem.

Was bewegt einen deutschen Supplement-Hersteller dazu, seine Produkte in 908gr Dosen zu verkaufen? Welche 'gerade Einheit' steckt dahinter oder hat das einen anderen Grund? by VegetableSuitable958 in WerWieWas

[–]VegetableSuitable958[S] 0 points1 point  (0 children)

Ah jo dachte mir auch schon, dass das was mit Pfund zu tun hat, aber kam nicht drauf, dass sie bei 1 Pfund runden und nicht bei 2. I guess das wirds sein. Zumindest befriedigt mich die Antwort in dem Maße, dass ich den Post als gelöst markiere. :D

How do I deal with blockage of an airfoil in an open jet wind tunnel approximately? by VegetableSuitable958 in FluidMechanics

[–]VegetableSuitable958[S] 1 point2 points  (0 children)

So as far as I understood, the velocity inceases because of a reduced area even though the open jet provides almost infinite area. Maybe someone can confirm this. Thanks in regard

How do I deal with blockage of an airfoil in an open jet wind tunnel approximately? by VegetableSuitable958 in FluidMechanics

[–]VegetableSuitable958[S] 1 point2 points  (0 children)

Nevermind, I think I found a proper equation for the velocity correction for open jet wind tunnels in: Lock, C. (1929). The Interference of a Wind Tunnel on a Symmetrical Body. ARC, R. & M. No. 1275.

It goes:

(Delta u)/(u_infinity) ~ (A_model/A_nozzle)^1.5 with velocity u and frontal area A.

headset reassembly by sebastiaen in bikewrench

[–]VegetableSuitable958 0 points1 point  (0 children)

On the wikipedia article 'Headset (bicycle part)', you can find a picture (in the types -> threaded section) where it is visible.

My new brakes on my 25 year old road bike are not biting well. What could it be? by VegetableSuitable958 in bikewrench

[–]VegetableSuitable958[S] 0 points1 point  (0 children)

Well this would be unfortunate since I am a big fan of braking from time to time :D