scholarly journals Changes in fluid mechanics after endovascular stenting: the pressure waves point of view

2002 ◽  
Vol 12 ◽  
pp. 134-139 ◽  
Author(s):  
F. Nicoud ◽  
H. Vernhet ◽  
M. Dauzat
Keyword(s):  
Fluid Mechanics ◽  
Point Of View ◽  
Pressure Waves ◽  
Endovascular Stenting

Chaotic advection of fluid particles

1990 ◽  
Vol 333 (1631) ◽  
pp. 273-288 ◽  
Keyword(s):  
Flow Field ◽  
Fluid Mechanics ◽  
Particle Motion ◽  
Basic Feature ◽  
Point Of View ◽  
Chaotic Advection ◽  
Dynamical Processes ◽  
Fluid Particles

Particle motion in a fluid can be chaotic even when the flow field is very simple from an eulerian point of view. This basic feature of fluid kinematics, known as chaotic advection, is reviewed and a number of applications are cited. The notion of a chaotic ‘kinematic template’ underlying dynamical processes is introduced and discussed. Some emerging directions of investigation for this application of chaos to fluid mechanics are indicated.

scholarly journals Coherent structures and chaotic advection in three dimensions

2010 ◽  
Vol 654 ◽  
pp. 1-4 ◽  
Author(s):  
STEPHEN WIGGINS
Keyword(s):  
Dynamical Systems ◽  
Fluid Mechanics ◽  
Coherent Structures ◽  
Three Dimensional ◽  
Point Of View ◽  
Three Dimensions ◽  
Chaotic Advection ◽  
Periodic Flow ◽  
Two Dimensional ◽  
Time Periodic

In the 1980s the incorporation of ideas from dynamical systems theory into theoretical fluid mechanics, reinforced by elegant experiments, fundamentally changed the way in which we view and analyse Lagrangian transport. The majority of work along these lines was restricted to two-dimensional flows and the generalization of the dynamical systems point of view to fully three-dimensional flows has seen less progress. This situation may now change with the work of Pouransari et al. (J. Fluid Mech., this issue, vol. 654, 2010, pp. 5–34) who study transport in a three-dimensional time-periodic flow and show that completely new types of dynamical systems structures and consequently, coherent structures, form a geometrical template governing transport.

Linear pressure waves in fogs

1995 ◽  
Vol 299 ◽  
pp. 187-215 ◽  
Author(s):  
R. Duraiswami ◽  
A. Prosperetti
Keyword(s):  
Present Method ◽  
Mean Free Path ◽  
Point Of View ◽  
Order Effects ◽  
Pressure Waves ◽  
Leading Order ◽  
General Applicability ◽  
Averaged Equations ◽  
Multi Phase ◽  
Low Amplitude

The modelling of small-amplitude pressure waves in dilute single- or multi-component fogs by means of averaged equations is considered. The problem is cast in a singular-perturbation framework in which the suspended droplets are the singularities. This point of view simplifies the local problem in the vicinity of the droplets. Matching in the overlap region provides the coupling with the averaged fields. Among the advantages of the method is the fact that the leading-order effects are clearly identified. In particular it is shown that, for low-amplitude waves and far below the fluid's critical point, phase change effects only start to be important when the vapour mean free path becomes comparable with the drop radius and dominate for yet smaller drops.This present method for the derivation of effective equations appears to be of general applicability to a variety of multi-phase situations and is illustrated in detail.

Jomon pottery observed from the point of view of fluid mechanics

2004 ◽  
Vol 7 (4) ◽  
pp. 349-356 ◽  
Author(s):  
Y. Nakayama ◽  
M. Oki ◽  
K. Aoki ◽  
S. Takayama
Keyword(s):  
Fluid Mechanics ◽  
Point Of View

scholarly journals Application of the Theory of a Single First Order Equation to Traffic Flow

2014 ◽  
Vol 9 (1) ◽  
pp. 175-181
Author(s):  
Harideo Chaudhary
Keyword(s):  
Fluid Mechanics ◽  
Traffic Flow ◽  
Open Channel ◽  
Flow Problem ◽  
Order Equation ◽  
Point Of View ◽  
Highway Traffic ◽  
First Order ◽  
Moving Vehicles ◽  
Mathematical Relationships

Few years ago, Lighthill and Whitham (1955) published a lengthy paper dealing with the theory of highway traffic flow .The basic idea in their approach to the problem is that the flow of traffic along a highway is analogous to the flow of a fluid in an open channel or pipe. This point of view replaces a long column of closely spaced discrete moving vehicles with an equivalent continuous moving stream of liquid (e.g. water) or gas (e.g. air). In other words, Lighthill and Whitham analyzed the phenomenon of traffic flow as though it were a problem in fluid mechanics. This approach allows some, though certainly not all, of the physical and mathematical relationships of hydrodynamics and aerodynamics to be utilized in the traffic flow problem. (Bank, p. 272) DOI: http://dx.doi.org/10.3126/jie.v9i1.10681Journal of the Institute of Engineering, Vol. 9, No. 1, pp. 175–181

On the Transient of Pressure Waves in Ducts for Systems Operating in Industrial Automation

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Arcangelo Messina ◽  
Giosué Rollo
Keyword(s):  
System Modeling ◽  
Practical Interest ◽  
Point Of View ◽  
Finite Volumes ◽  
Pressure Waves ◽  
Transient Pressure ◽  
Industrial Automation ◽  
Global Dynamic ◽  
Study Results ◽  
Experimental Validations

Within the frame of industrial automation, the mechanical power related to pneumatic actuator systems involves air flows along with mechanical component, such as valves, connecting tubes, cylinder chambers and possible linkages in order to finally actuate a specific objective. Gas dynamic of the air flowing into connecting ducts plays a fundamental role in the description of the global dynamic phenomena of these systems. Several studies deal with the dynamics of such pneumatic systems but through streamlined analysis where the influence of pressure-waves propagating in ducts is neglected or poorly described. The related models are even more complex when finite volumes are placed at the ends of connecting lines. In this paper, two different mathematical models describing transient pressure-waves propagating through lines closed by finite volumes are presented. The investigation regards pressure and velocity ranges normally operating in industrial pneumatic systems. Besides the value of new system modeling of different complexity, these models are compared from an analytical and numerical point of view; advantages, disadvantages, weakness, abilities, and inabilities are highlighted and, finally, the relevant analysis is corroborated through experimental validations of wave propagating pressure at fixed positions of ducts. This study results both in the presentation of models of practical interest, as well as in an attempt to provide an elucidation on the need to resort to an accurate model rather than a streamlined one with respect to the geometric and/or operative characteristics of industrial pneumatic systems.

scholarly journals Kyokusui-no-en Considered from Fluid Mechanics Point of View

1994 ◽  
Vol 14 (Supplement1) ◽  
pp. 191-194
Author(s):  
Yasuki NAKAYAMA ◽  
Katsumi AOKI ◽  
Makoto OKI
Keyword(s):  
Fluid Mechanics ◽  
Point Of View

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

How a sheperd guides a sheep herd?

1984 ◽  
Vol 75 ◽  
pp. 331-337
Author(s):  
Richard Greenberg
Keyword(s):  
Point Of View ◽  
Single Ring ◽  
Damping Effects ◽  
Ring Particle

ABSTRACTThe mechanism by which a shepherd satellite exerts a confining torque on a ring is considered from the point of view of a single ring particle. It is still not clear how one might most meaningfully include damping effects and other collisional processes into this type of approach to the problem.

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