A simple technique for developing and visualising stratified fluid dynamics: the hot double-bucket

2021 ◽  
Vol 62 (5) ◽  
Author(s):  
Kial D. Stewart ◽  
Callum J. Shakespeare ◽  
Yvan Dossmann ◽  
Andrew McC. Hogg
Keyword(s):  
Fluid Dynamics ◽  
Simple Technique ◽  
Stratified Fluid

Atmospheric Gusts

1965 ◽  
Vol 69 (649) ◽  
pp. 27-45 ◽  
Author(s):  
J. K. Zbrożek
Keyword(s):  
Fluid Dynamics ◽  
Atmospheric Turbulence ◽  
Simple Technique ◽  
Global Scale ◽  
Concerted Effort ◽  
Spectral Technique ◽  
Air Turbulence ◽  
Aircraft Engineering ◽  
Simplifying Assumptions ◽  
Active Research

Summary:—Starting with atmospheric motions on a global scale, different categories of atmospheric turbulence are discussed. It is pointed out that the turbulence within the earth’s boundary layer is comparatively better understood than any other type of turbulence, due to a concerted effort by meteorologists and by aircraft engineers. Clear air turbulence, turbulence in clouds and storms are subjects of active research, but we are still at the beginning of the understanding of these phenomena.The influence of atmospheric turbulence on some aspects of aircraft engineering is mentioned and the problem of the calculation or turbulence-induced loads is discussed in some detail. It is pointed out that the estimation of turbulence loads is a transposition of experience gained on one aircraft to another. The most simple technique of doing so is to assume that the atmospheric turbulence can be represented by a collection of single, isolated gusts and by making very simplifying assumptions about the dynamics of aircraft response. This technique, the discrete gust approach, in spite of serious theoretical reservations, has worked admirably well, but it appears that in many applications the limits of usefulness of the discrete gust approach have been reached. The alternative way of dealing with gusts is to treat them as a basically continuous phenomenon using the comparatively recently developed spectral technique. This technique not only permits the aircraft dynamics to be properly accounted for, but also describes the atmospheric turbulence in more realistic fashion, understandable not only to aircraft engineers but also to meteorologists and students of fluid dynamics.

Hamiltonian description of stratified fluid dynamics

1983 ◽  
Vol 26 (1) ◽  
pp. 40 ◽  
Author(s):  
F. S. Henyey
Keyword(s):  
Fluid Dynamics ◽  
Stratified Fluid ◽  
Hamiltonian Description

Forced vertical oscillations in a viscous stratified fluid

1969 ◽  
Vol 66 (3) ◽  
pp. 617-627 ◽  
Author(s):  
B. D. Dore
Keyword(s):  
Fluid Dynamics ◽  
Steady State ◽  
Boundary Layers ◽  
Phase Angle ◽  
Kinematic Viscosity ◽  
Vertical Motion ◽  
Stratified Fluid ◽  
Boundary Motion ◽  
Steady State Oscillation ◽  
Exponential Stratification

AbstractThe linear fluid dynamics is considered when infinite vertical boundaries are set in oscillatory vertical motion. The case of exponential stratification with constant kinematic viscosity is explicitly studied. When the forcing frequency equals the Brunt–Vaisälä frequency for the fluid, the customary boundary layers are absent in the steady-state oscillation, however small be the kinematic viscosity; for a semi-infinite fluid the corresponding horizontal extent of the region influenced by the boundary motion is then of the order of the stratification length. The sign of the phase angle is everywhere dependent on whether the magnitude of the forcing frequency is greater than or less than that of the Brunt–Vaisäla frequency.

A Simple Technique for Obtaining a Colon Biopsy Specimen per Rectum

1962 ◽  
Vol 42 (2) ◽  
pp. 157-159 ◽  
Author(s):  
Eugene J. Gangarosa ◽  
William R. Beisel
Keyword(s):  
Biopsy Specimen ◽  
Simple Technique ◽  
Colon Biopsy

An Introduction to Fluid Dynamics

2000 ◽  
Author(s):  
G. K. Batchelor
Keyword(s):  
Fluid Dynamics
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