# Questions tagged [vortex]

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### Acceleration of fluid in a magnetohydrodynamics vortex

In the following video we see a mercury vortex done by magnetohydrodynamics: https://youtu.be/au4hbUm4mMo In the following manuscript they say that the fluid will accelerate according to (14) ${}^1$: ...
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### Can I treat fluid a rigid body calculating Moment of inertia? If not, how would I calculate it?

I wanted to set out calculating how much moment of inertia a bottle of water had so as to see how fast a bottle had to spin to create a non-zero constant angular velocity in the water. As I understand,...
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### Will two rotating disks in a fluid be 'attracted' to each other?

Imagine two rotating disks in a fluid like this drawing here: The rotating disks will create a rotating flow by friction in the fluid. The flow between the disks will be higher velocity than the ...
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### How does gravity affect the formation of vortices?

Context: I understand the axis of vortices can form in any direction (like underwater used by fishes). However, in large vortices in water bodies, for example, in a closed water bottle, the centre of ...
34 views

### Why is the energy of a vortex in a superconductor finite?

I just had a glimpse of the Ginzburg-Landau theory of superconductivity. I am surprised that that the energy of a vortex is finite. This is surprising because as far as I know, in superfluids, the ...
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### Bean model: Pinning force vs. magnetic? force

I am trying to study the Bean model, and as I understand, there are two forces at play. First, we apply an external field parallel to the surface, which varies in x. This causes a current density, and ...
1 vote
37 views

### Why does my coffee spin the opposite way that I spin the cup?

I was just drinking a latte in a large cup, and when I spun the cup (doing that smooth one handed “mixing” thing that you usually see with a mixed drink or something) I noticed the design on and the ...
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### Reference/source of the "derivation" of the magnetic force moment on anisotropic superconductor (type II)

I have been reading a diploma thesis of a fellow physics student and I have came across the following that was not referenced in any way (I want to read about it some more): The section starts... In ...
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### What role do quantized vortices play from the Superfluid model in Superfluid Vacuum Theory?

When rotating a superfluid (such as $^{4}$He) below its critical temperature, sometimes quantized vortices pop up, depending how fast one rotates this superfluid. In the SVT model, they propose that ...
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### Why do "quantum vortices" form in superfluids?

I've been reading up on Superfluids, and they've fascinated me. I understand why their superfluid component has zero viscosity, but there's one aspect that's bothering me, and that's the formation of ...
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### Argument for flux quantization

I am reading P. Coleman's Introduction to many-body physics. Coleman claims that At large distances, energetics favor a reduction of the circulation to zero $$\lim_{R\rightarrow \infty}\omega=0$$ ...
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### How can I compute the axis of rotation of a fluid vortex from the velocity field?

Let's say I have data on the velocity vector field of a fluid vortex such as e.g. a Hurricane available on a regular 2D grid. How can I compute the axis of rotation of the velocity vector field to ...
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### How exactly do vortices generate sound and cause pressure fluctuations to produce sound waves?

I wish to understand qualitatively, how vortices generate sound by creating longitudinal sound waves? Vortices are often mentioned as the cause of sound production for things like corrugated whirly ...
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### Is vortex physics key to understand the universe simulation hypothesis? [duplicate]

Seth Lloyd, US computer scientist and Professor of Mechanical Engineering and Physics at the renowned Massachusetts Institute of Technology (MIT) says that the universe itself is a giant quantum ...
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1 vote
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### Kelvin's Circulation theorem

Recently, I dipped my spoon into my tea. I saw that as I dipped my spoon into my tea, two vortices formed at both edges of the spoon. I guess this is similar to vortices forming at the end of ...
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1 vote
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### Surface tension between normal and superconductor phases

I am studying the phenomenological description of superconductors based on Tinkham's Introduction to Superconductivity. In Chapter 2.3.2. it discusses the difference between Type-1 and Type-2 ...
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### Energy density of a cosmic string in the Abelian Higgs Model (Nielsen-Olesen Vortex)

my question is what the energy density of a cosmic string in the abelian higgs model is? I have different sources (Scholarpedia Cosmic Strings, the book "Cosmic Strings and Topological Defects&...
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### Curved shocks and vorticity generation

In fluid dynamics, it is known that curved shocks (which are common, e.g., in bowshocks) generate vorticity. I am looking for a quantitative derivation.