Turbulence and why eddy breakups take place?

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Discussion Overview

The discussion focuses on the mechanisms of energy cascade in turbulent flow, specifically addressing why eddies break up and how energy is transferred from larger to smaller eddies. The scope includes theoretical aspects of turbulence and energy dynamics in fluid mechanics.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants inquire about the theoretical underpinnings of energy transfer in turbulent flow, specifically questioning the reasons behind large eddies breaking up.
  • One participant expresses uncertainty about how large eddies transfer energy to smaller ones, seeking a physical explanation for this phenomenon.
  • Another participant poses multiple questions regarding the energy cascade, including the mechanisms of eddy breakup and the differences between kinetic energy at macro and micro scales.
  • A later reply suggests considering shear forces and angular momentum as factors influencing the energy transfer process, questioning the ease of movement between large and small objects.

Areas of Agreement / Disagreement

Participants generally express curiosity and seek clarification on the topic, but no consensus is reached regarding the mechanisms of energy transfer or the reasons for eddy breakup.

Contextual Notes

Participants' questions indicate a reliance on theoretical frameworks without fully defined terms or assumptions, leaving some aspects of the discussion unresolved.

Who May Find This Useful

Readers interested in fluid dynamics, turbulence theory, and energy transfer mechanisms in physics may find this discussion relevant.

Vashliana
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How to explain energy cascade mechanisms? Why eddy breakups take place?
 
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Vashliana said:
How to explain energy cascade mechanisms? Why eddy breakups take place?
Welcome to PF.

Can you post some links to the reading you have been doing about this? That will get you a lot better responses than just asking very broad questions without many explicity definitions and questions. Thanks.
 
hello again
Simply I studied about Turbulent flow and the Richardson energy cascade theoretically, but from the view point of physics i don't know how and why large eddy transfers energy to the smaller one?
thanks
 
hello

i have some questions about energy cascade in turbulent flow. I know that large eddies transfer energy to smaller one and ..., my first question is why large scales should breakup?
second : how these eddies transfer energy and what is the eddy breakup mechanism ?
and finally: we have kinetic energy in both bulk and molecular scale, what is the difference between these two kinetic energy (macro and micro)?
thanks a lot
 
Vashliana said:
but from the view point of physics i don't know how and why large eddy transfers energy to the smaller one?
Think about shear forces and angular momentum, and size. Is it easier to turn (roll) a large object or smaller object?
 

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