All Questions
353 questions
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Rotation of wind in low and high pressure zones
Why do winds rotate counterclockwise around low-pressure systems and clockwise around high-pressure systems in the Northern Hemisphere?
If this rotation of wind is because of the Coriolis effect ...
- 507
1
vote
0
answers
83
views
Do fluid streams attract each other ("pinch" or bundle together)?
Do fluid streams (air coming out of two jet engines, one on each wing; hot gas coming out of multiple rocket nozzles, etc.) attract one another ("pinch" or bundle together)?
cf. History of ...
- 2,227
6
votes
1
answer
381
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Zero vorticity for ideal flow
My notes state that the given the vorticity equation:
$$\frac{\partial \boldsymbol \omega}{\partial t} + (\mathbf{v} \cdot \nabla)\boldsymbol\omega = (\boldsymbol\omega \cdot \nabla)\mathbf{v} + \nu \...
- 79
1
vote
1
answer
146
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Curl of singular phase using Dirac's delta function
I am investigating topological defects using a complex-valued order parameter of the form
$A=|A|e^{i\theta}$.
A defect is located wherever the phase $\theta$ is not defined and can be spatially ...
- 11
0
votes
1
answer
109
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Will vortex tubes produce cold and hot water?
We all know that in the atmosphere, when air is sprayed into the vortex tube inlet, the vortex tube produces cold and hot air. My idea is, if we were underwater and spray water into the inlet of the ...
- 2,338
1
vote
0
answers
99
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What causes the oscillation in vortex shedding?
When studying this video, I was wondering: what actually causes the oscillation in vortex shedding? Most online sources say it's due to oscillating low-pressure zones—but what causes that oscillation?
...
- 375
0
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0
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112
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Question on divergence (convergence) and wind from (into) areas of low (high) pressure
A) Divergence (convergence) and wind from (into) areas of high (low) pressure taking the Coriolis force into account is clear.
B) But there is also divergence (convergence) and wind from (into) areas ...
- 977
4
votes
1
answer
212
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Blasius's theorem - Fluid Dynamics
So my fluid's professor gave us an exercise where we had to calculate the force exerted on a wall by a vortex separated a distance $d$ to it. By the method of images we can build the complex potential ...
- 139
1
vote
1
answer
197
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When is the Lamb vector the gradient of a function?
There is something I am not seeing in this derivation of advanced Bernoulli's principle: https://open.oregonstate.education/intermediate-fluid-mechanics/chapter/bernoulli-equation/
The Lamb vector is ...
- 7,030
1
vote
1
answer
317
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How to derive the axisymmetric stokes stream function formulation of incompressible vorticity equation?
I'm stuck trying to derive the convective terms in the momentum equation for the Stokes stream function in axisymmetric cylindrical coordinates. I'm starting with the vorticity equation:
$$\dfrac{\...
- 55
1
vote
1
answer
139
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My question is, will the imagined device also generate cold air like a vortex tube? [closed]
We all know that vortex tubes can generate cold air.
As shown in the picture, I imagined a device with a nozzle at the top. The compressed air flowing out first passes through a cylindrical space, ...
- 2,338
0
votes
0
answers
68
views
Boundary Conditions for Landau-Ginzburg equations of Superconducting Vortex anti-Vortex pair
I am trying to understand the V-aV pair in a superconductor (SC). I thought we could simply take the order parameter for an isolated vortex and multiply it with an order parameter for an antivortex:
$$...
- 501
0
votes
0
answers
85
views
Does gravity introduce vorticity into a previously divergence free fluid flow?
Assume a flow enters the vertical pipe's inlet at a uniform speed $v=v_0$ (so zero vorticity) and flows out of the pipe under gravity.
My question is will the three particles $A, B$, and $C$ cross ...
- 13
1
vote
0
answers
111
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What happens to gold when it is caught in a river vortex?
A pile of gravel is evident in a creek after a high water event. The pile of gravel is created by a vortex in the flow. Gold is the densest material in this creek, with a mass of 19 grams per cubic ...
- 11
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224
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Quark strings/gluon flux tubes connecting quarks - what are their properties? Are they topological vortices?
In QCD there are often used 1D objects connecting quarks, also said to be the original inspiration for string theory, referred as quark strings or gluon flux tube - are they the same?
Asking for their ...
- 1,196