Temat: instabilities - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Absolute instability of compressible three-dimensional flow
Autorzy:: Tuliszka-Sznitko, E.
Powiązania:: https://bibliotekanauki.pl/articles/1954544.pdf
Data publikacji:: 1999
Wydawca:: Politechnika Gdańska
Tematy:: numerical simulations
compressible flow
instabilities
absolute instability
Opis:: In the present paper the instability character (absolute/convective) of compressible viscous flow around geometries rotating in uniform flow is analysed. The linear local stability theory is used to investigate the boundary layer stability. Following the works of Briggs and Bers in the field of plasma physics, the absolute instability region is identified by singularities of dispersion relation called pinch - points. Calculations have been made for different Mach numbers and wall temperatures.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 1; 5-16
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Clustering instabilities, arching and anomalous interaction probabilities as examples for cooperative phenomena in dry granular media
Autorzy:: Luding, S.
Powiązania:: https://bibliotekanauki.pl/articles/1953965.pdf
Data publikacji:: 1998
Wydawca:: Politechnika Gdańska
Tematy:: clustering instabilities
arching
anomalous interaction probabilities
cooperative phenomena
dry granular media
freely cooling granular material
Opis:: In a freely cooling granular material fluctuations in density and temperature cause position dependent energy loss. Due to strong local dissipation, pressure and energy drop rapidly and material moves from "hot" to "cold" regions, leading to even stronger dissipation and thus causing the density instability. The assumption of "molecular chaos" is valid only in the homogeneous cooling regime. As soon as the density instability occurs, the impact parameter is no longer uniformly distributed. The pair-correlation and the structure functions show that the molecular chaos assumption-together with reasonable excluded volume modeling-is important for short distances and irrelevant on large length scales. In this study, the probability distribution of the collision frequency is examined for pipe flow and for freely cooling granular materials as well. Uncorrelated events lead to a Poisson distribution for the collision frequencies. In contrast, the fingerprint of the cooperative phenomena discussed is a power-law decay of the probability for many collisions per unit time.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 3; 417-442
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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