Linked Questions
15 questions linked to/from Does a wing in a potential flow have lift?
3
votes
0
answers
54
views
Would birds be able to fly if the air had no viscosity? [duplicate]
There are already many answers to the general question of why birds or planes can fly. But my question is more specific: I would like to understand the relative importance of the viscosity. The air ...
- 51
291
votes
17
answers
82k
views
What really allows airplanes to fly?
What aerodynamic effects actually contribute to producing the lift on an airplane?
I know there's a common belief that lift comes from the Bernoulli effect, where air moving over the wings is at ...
- 77.2k
11
votes
1
answer
12k
views
What is a Physically Accurate Explanation for the Kutta Condition?
Countless arguments between highly intelligent people have been waged (on this very site in fact) as to exactly how lift can be explained in an experimentally and mathematically rigorous way. Taking ...
- 3,966
5
votes
2
answers
3k
views
Does a conductor of total charge zero placed in a uniform external electric field experience net force?
The question I have in mind is: If we place a conductor (arbitrary shape) of total charge zero in a uniform external electric field $\textbf{E}_0$, does it experience any net force? Why (not)?
Now I ...
- 203
7
votes
3
answers
1k
views
What is the theoretical justification for a fluid flow's being irrotational?
I am not a fluid dynamicist, and I really just began thinking about this problem as my curiousity drew me into building an answer for the question What really allows airplanes to fly?.
It is very ...
- 89.3k
5
votes
3
answers
5k
views
When is a flow vortex free?
To solve problems in fluid dynamics one states often the assumption that the flow is vortex free i.e.
$rot(u) = 0$
It is a basic assumption which is needed for potential flow problems etc.. My ...
- 153
2
votes
3
answers
2k
views
Fluid Flow and Reynold's number
I am confused about the conditions on the Reynolds number for an ideal fluid flow.
Now, an ideal fluid flow is approximated by real fluid flow with a high Reynolds number (except for if the flow ...
- 222
1
vote
2
answers
2k
views
By what mechanism is lift produced on a rotating cylinder in an inviscid flow?
I am taking some introductory fluid dynamic classes, and have become very confused by the Kutta-Joukowski theorem. One of the conclusions that can be derived by applying Kutta-Joukowski is that a ...
- 731
6
votes
1
answer
1k
views
Conditions of applicability of potential flow about an airfoil
In many cases the flow about an airfoil is calculated by solving the Laplace equation, (for example in the Hess-Smith panel method). If the velocity field is irrotational and its divergence its zero, ...
- 61
3
votes
2
answers
2k
views
What is irrotational flow? How to judge?
For example, when the wing moves horizontally, the direction of fluid flow changes first to upward at the leading edge of the wing and then to downward at the trailing edge. Does it rotate? If the ...
- 2,165
1
vote
3
answers
635
views
Equal transit time fallacy and Newton's laws of motion
I've seen the equal transit time theory being used to explain aerodynamic lift [basis is Bernoulli's principle] several times. However recently I've been told that there is NO physical compulsion for ...
user122395
0
votes
1
answer
727
views
Vortex formation in an airfoil
How is a starting vortex formed when an airfoil (i.e cross-section of wings of a plane) starts to move?
- 345
-3
votes
1
answer
365
views
If the wing is absolutely smooth and has no friction, will it still generate lift?
I think it will generate lift, because downwash air flow still exists. But I'm not sure if I'm right.
- 2,165
0
votes
1
answer
127
views
Lifting line trailing vortex/vortex sheet inside flow field
With refference to the lifting line model, do we consider trailing votex or vortex sheet to be inside the flow field ?
because the vortex core is rotational and we violate one of the flow field ...
- 1
1
vote
0
answers
73
views
How does Bernoulli's principle produce wing lift? [duplicate]
In the Ray Kurzweil's book How to create a mind is said that:
The mathematics of how Bernoulli's principle produces wing lift is still not yet fully settled among scientist [...]
What does this ...
- 99