Coherence length of velocity fields

In summary, the term "coherence length of velocity field ##\lambda##" refers to the distance at which structures in propagating waves can be maintained. This can also be related to quantum decoherence. However, the paper in question does not clearly define this term, causing frustration for the reader. The assumption is that it is referring to the same concept as explained in the Wikipedia article on coherence length.
  • #1
Apashanka
429
15
I have came across a term "coherence length of velocity field ##\lambda## ",tried to search in the internet but doesn't find any result...will anyone please give a brief summary of this in this context..
 
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  • #2
You'll have to give more context and details. Where exactly did you read this?
 
  • #3
DrClaude said:
You'll have to give more context and details. Where exactly did you read this?
Okay fine the paper is
https://arxiv.org/abs/1703.08809And the line where I have read this is in the 2nd paragraph
IMG_20190531_194308.jpg
 
  • #4
Can anyone please help..
 
  • #5
It's very frustrating that they never define what they mean by coherence length.

Typically, coherence length is the distance for which structures in propagating waves can be maintained. That is, if you start a pulse with a specific shape, after the coherence length the pulse will become diffused, its structure lost.

In quantum mechanics, this might also have something to do with quantum decoherence. But in any event, it would have been nice if they would have explained what they meant by the term. In the mean time, a reasonable assumption that they're talking about the exact same thing as explained in this Wikipedia article:
https://en.wikipedia.org/wiki/Coherence_length
 
  • #6

FAQ: Coherence length of velocity fields

What is the coherence length of velocity fields?

The coherence length of velocity fields refers to the distance over which the velocity of a fluid remains correlated. In other words, it is the distance over which the velocity patterns of a fluid remain similar.

Why is the coherence length of velocity fields important?

The coherence length of velocity fields is important because it provides information about the stability and predictability of fluid motion. A longer coherence length indicates a more stable and predictable flow, while a shorter coherence length indicates a more chaotic and unpredictable flow.

How is the coherence length of velocity fields measured?

The coherence length of velocity fields can be measured using various techniques, such as laser Doppler velocimetry or particle image velocimetry. These techniques involve measuring the velocity of particles or tracer particles in a fluid and analyzing their spatial correlation.

What factors affect the coherence length of velocity fields?

The coherence length of velocity fields can be affected by various factors, such as the viscosity and density of the fluid, the velocity of the flow, and the presence of obstacles or turbulence in the flow. Changes in these factors can lead to changes in the coherence length.

How is the coherence length of velocity fields used in practical applications?

The coherence length of velocity fields is used in various practical applications, such as in the design of aerodynamic systems, the prediction of weather patterns, and the optimization of industrial processes. Understanding the coherence length can help improve the efficiency and stability of these systems.

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