But the speeding up air is what causes the pressure gradient

So have a chew on that one :p

Yea it kinda feels like a trap 😄 it seems to be irreversible in some way

Only in the sense that we like to have an "A causes B" explanation about things

And our brains aren't great at thinking about situations where "A causes B, but B causes A"

Yes okay I think I will just have to be okay with that

A similar example is light, where you have simultaneous oscillations in the electric and magnetic fields, and each "causes" the other

I'm completing an introductory course in fluid mechanics as a maths undergrad in the UK

Is here an alright place to ask questions that are probably fairly basic?

You seem to be using the server to think out loud. For that purpose, I'd suggest using a note taking app on your computer.

wdym? i know im sending messages after ive asked a question, but if ur talking about the thing i posted in general help, there was actually a question there rather it being a statement/series of statements

this is a common misconception and thoroughly unfounded. The air over the top actually arrives at the back edge of the wing before the air at the bottom does. But the bernoulli principle is actually the wrong way to understand this. It's backwards logic. The air over the wing isn't low pressure because it's faster, it's faster because it's low pressure. As the air flows over the top of the wing it has to deflect downwards to not leave a vacuum over the wing. However, air does not just spontaneously deflect. It needs a pressure differential to produce an acceleration that pulls it down. Since the pressure above is fixed at atmospheric pressure, the pressure below (at the wing's upper surface) must be lower than atmospheric, sucking the wing up, producing lift. Incidentally, this happens to accelerate the air flowing through this low pressure region due to bernoulli's principle (the air coming into the region from in front instead of from above gets sucked forward instead of getting sucked down, causing the air to accelerate). The same process also happens on the bottom of the wing but in reverse, with a high pressure region forming which pushes the wing up and deflects the air down so it doesn't crash into the wing surface, also incidentally slowing the air down. But the change in air velocity above and below the wing are entirely incidental effects, happening as a direct cause of the pressure differences, and are not the cause of the pressure differences.

Yo might be a weird question but has anyone ever stumbled on good papers regarding turbulence modeling of an eagle? haha trying to study the control of turbulent flow of an eagle on a more in depth basis and on a simulation in openfoam

I think you should ask directly to the eagle

some years ago, i think last year, i saw a presentation of someone using openfoam for drone the ones that flap as an insect/bird maaaaybe looking from there could lead you in a good path? (i can not remember the person presenting but maybe looking with drone + openfoam gives a hint)

I don't know if this is what you had in mind but there is Romain Poletti doing some flapping wings/overset/FSI stuff : https://pubs.aip.org/aip/pof/article-abstract/36/8/081901/3306931/On-the-unsteady-aerodynamics-of-flapping-wings?redirectedFrom=fulltext Not sure if it corresponds to what @Pflegeverantwortungsöl is looking for though

I know it is not the same, but would guess that his research will might give some clues in that more niche field

I don't know, but for sure they do pretty cool FSI stuff!

I especially want to study the instability -> their active correction for turbulence to apply that to a drone prototype with active ailerons and sensors

This is already a good start for the macroperspective, thank you

Tried it? https://arxiv.org/abs/2501.06327

Guys any career related can be discussed? like i want to work on masters thesis w openfoam or opportunities etc

Difficult to help if we dont know what you do

I was coming here to ask a similar question 😂 I’ve started working on CFD four years ago for my PhD using fluent and flow3D for metal 3D printing and am currently looking for a position in Holland, but struggling to find any opportunities Are there any people working in this region by any chance ? Once my PhD is finished (hopefully in less than two months) I’d like to start using OpenFOAM to add it to my CV

Is there some kind of monthly newsletter or something similar available from openfoam.com? I'm wondering what is going on over there.

The support enquiry sections at openfoam.com are not available..?

I don't think so or I am not aware of it. They used to do webinars after each new release but they stopped few years ago

have anyone tried to make art using solvers? its kind of an off question but im interested in starting to create nice visuals

I guess everyone does. Isn't it art to properly mesh and run a simulation? 😅 More seriously, I think it depends what you have in mind when you say "make art"

Sometimes our incorrect simulations do make an art which we never expect and produce meaningless but colorful results😅