Decomposition of Acoustic and Entropy Modes in a Non-Isothermal Gas Affected by a Mass Force

Anna Perelomova; Sergey Leble

doi:10.24425/123921

Decomposition of Acoustic and Entropy Modes in a Non-Isothermal Gas Affected by a Mass Force

Abstrakt

Diagnostics and decomposition of atmospheric disturbances in a planar flow are considered in this work. The study examines a situation in which the stationary equilibrium temperature of a gas may depend on the vertical coordinate due to external forces. The relations connecting perturbations are analytically established. These perturbations specify acoustic and entropy modes in an arbitrary stratified gas affected by a constant mass force. The diagnostic relations link acoustic and entropy modes, and are independent of time. Hence, they provide an ability to decompose the total vector of perturbations into acoustic and non-acoustic (entropy) parts, and to establish the distribution of energy between the sound and entropy modes, uniquely at any instant. The total energy of a flow is hence determined in its parts which are connected with acoustic and entropy modes. The examples presented in this work consider the equilibrium temperature of a gas, which linearly depends on the vertical coordinate. Individual profiles of acoustic and entropy parts for some impulses are illustrated with plots.

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Autorzy (2)

Anna Perelomova prof. dr hab.
Sergey Leble
- Immanuel Kant Baltic Federal University

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Wersja publikacji: Accepted albo Published Version
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.24425/123921
Licencja: otwiera się w nowej karcie

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Kategoria:: Publikacja w czasopiśmie
Typ:: artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:: Archives of Acoustics nr 43, strony 497 - 503,
ISSN: 0137-5075
Język:: angielski
Rok wydania:: 2018
Opis bibliograficzny:: Perelomova A., Leble S.: Decomposition of Acoustic and Entropy Modes in a Non-Isothermal Gas Affected by a Mass Force// Archives of Acoustics. -Vol. 43, iss. 3 (2018), s.497-503
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.24425/123921
Weryfikacja:: Politechnika Gdańska