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3 - Objectivity of Transport Barriers

Published online by Cambridge University Press:  20 February 2023

George Haller
Affiliation:
ETH Zurich
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Summary

If we accept that transport barriers should be material features for experimental verifiability, we must also remember a fundamental axiom of mechanics: material response of any moving continuum, including fluids, must be frame-indifferent.This means that the conclusions of different observers regarding material behavior must transform into each other by exactly the same rigid-body transformation that transforms the frames of the observers into each other. This requirement of the frame-indifference of material response is called objectivity in classical continuum mechanics. Its significance in fluid mechanics is often overlooked or forgotten, which prompts us to devote a whole chapter to this important physical axiom. We clarify some common misunderstandings of the principle of objectivity in fluid mechanics and discuss in detail the mathematical requirements imposed by objectivity on scalars, vectors and tensors to be used in describing transport barriers.

Type
Chapter
Information
Transport Barriers and Coherent Structures in Flow Data
Advective, Diffusive, Stochastic and Active Methods
, pp. 60 - 97
Publisher: Cambridge University Press
Print publication year: 2023

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