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• W2549876985 abstract "Form-invariance (covariance) and frame-indifference (objectivity) are two notions in classical continuum mechanics which have attracted much attention and controversy over the past decades. Particularly in turbulence modelling it seems that there still is a need for clarification. The aim and purpose of this study is fourfold: (i) To achieve consensus in general on definitions and principles when trying to establish an invariant theory for modelling constitutive structures and dynamic processes in mechanics, where special focus is put on the principle of Material Frame-Indifference (MFI). (ii) To show that in constitutive modelling MFI can only be regarded as an approximation that needs to be reduced to a weaker statement when trying to advance it to an axiom of nature. (iii) To convince that in dynamical modelling, as in turbulence, MFI may not be utilized as a modelling guideline, not even in an approximative sense. Instead, its reduced form has to be supplemented by a second, independent axiom that includes the microscopic (fluctuating) description of the dynamical processes. Concerning Navier-Stokes turbulence, the axiom of Turbulent Frame-Indifference (TFI) is stated in which turbulence has to be modelled consistently with the invariant properties of the deterministic Navier-Stokes equations, and finally (iv) to propose a novel invariant modelling ansatz both for constitutive and dynamical modelling that allows to include the (mean) velocity field as an own independent modelling variable, however, not in an absolute but only in the relative sense as a velocity difference; a result that would systematically improve current modelling procedures in extended thermodynamics and turbulence theory to be more consistent with physical observations." @default.
• W2549876985 created "2016-11-30" @default.
• W2549876985 creator A5065271704 @default.
• W2549876985 date "2016-11-21" @default.
• W2549876985 modified "2023-09-27" @default.
• W2549876985 title "Covariance and objectivity in mechanics and turbulence" @default.
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• W2549876985 hasPublicationYear "2016" @default.
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