- #1

Apashanka

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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

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Space news on Phys.org

- #2

DrClaude

Mentor

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You'll have to give more context and details. Where exactly did you read this?

- #3

Apashanka

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Okay fine the paper isDrClaude said:You'll have to give more context and details. Where exactly did you read this?

https://arxiv.org/abs/1703.08809And the line where I have read this is in the 2nd paragraph

- #4

Apashanka

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Can anyone please help..

- #5

kimbyd

Science Advisor

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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

Apashanka

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Can anyone please help me out here...they actually mean coherence length of peculiar velocity fieldApashanka said:Okay fine the paper is

https://arxiv.org/abs/1703.08809And the line where I have read this is in the 2nd paragraph

View attachment 244377

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.

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.

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.

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.

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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