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Wednesday, July 8, 2020 | History

3 edition of **Instability of time-periodic flows** found in the catalog.

Instability of time-periodic flows

Philip Hall

- 236 Want to read
- 20 Currently reading

Published
**1985**
by [Institute for Computer Applications in Science and Engineering], National Aeronautics and Space Administration, Langley Research Center in Hampton, Va
.

Written in English

- Fluid mechanics.

**Edition Notes**

Statement | Philip Hall. |

Series | ICASE report -- no. 85-46., NASA CR -- 178009., NASA contractor report -- NASA CR-178009. |

Contributions | Institute for Computer Applications in Science and Engineering. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL15273939M |

• General introduction to Hydrodynamic Instabilities • Linear instability of parallel flows o Inviscid vs. viscous, temporal vs. spatial, absolute vs. convective instabilities • Non-modal instabilities o Transient growth, resolvent, receptivity, sensitivity, adjoint equations • Extension to complex flows situations and non-linear. The peaks correspond to % e successive appearance and disappear- A study on time-periodic finite-gap cylinder flows ante of the instability rolls in a period (four times in this case). Figure 2 shows the critical times of appearance and disappearance of the instability (diamonds) as obtained from the w,,(t) curves for different Taylor numbers shown on the Cited by: 2.

Summary. Addressing classical material as well as new perspectives, Instabilities of Flows and Transition to Turbulence presents a concise, up-to-date treatment of theory and applications of viscous flow instability. It covers materials from classical instability to contemporary research areas including bluff body flow instability, mixed convection flows, and application areas of . Existence and uniqueness of time-periodic solutions to the Navier-Stokes equations in the whole plane. Discrete & Continuous Dynamical Systems - S, , 6 (5): doi: /dcdssCited by:

Addressing classical material as well as new perspectives, Instabilities of Flows and Transition to Turbulence presents a concise, up-to-date treatment of theory and applications of viscous flow instability. It covers materials from classical instability to contemporary research areas including bluff body flow instability, mixed convection flows, and application areas of aerospace and . Introduction to Hydrodynamic Stability. Instability of flows and their transition to turbulence are widespread phenomena in engineering and the natural environment, and are important in applied mathematics, astrophysics, biology, geophysics, meteorology, oceanography and physics as well as engineering.

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The simplest flow where this type of instability can occur is that due to the torsional oscillations of Instability of time-periodic flows book infinitely long circular cylinder. For more complicated spatially varying time-periodic flows a similar type of instability can occur and is spatially localized near the most unstable by: 3.

Get this from a library. Instability of time-periodic flows. [Philip Hall; Institute for Computer Applications in Science and Engineering.]. Figure 1: (a) A lab-on-a-chip aims to reduce in scale all of the elements of the chemical and processing worlds.

This scaling down involves flow and transport necessary for multiple chemical analyses, Cited by: We revisit the problem of flow-induced structural changes in semidilute polystyrene/dioctyl phthalate (PS/DOP) solutions below their theta temperature by focusing on the high-shear-stress regime where thickening occurs.

We observe a strong coupling of flow instabilities to the induced structure resulting from the enhanced concentration fluctuations. This behavior is manifested.

This book for the first time examines periodic motions to chaos in time-delay systems, which exist Instability of time-periodic flows book in engineering.

For a long time, the stability of time-delay systems at equilibrium has been of great interest from the Lyapunov theory-based.

The stability of the model plane Couette and plane Poiseuille problems for time-periodic flows has been thoroughly reviewed by Davis in one.

Using various optical and mechanical techniques we report on a shear induced structure (SIS) that results in instabilities during flow. The solution in this study is an equimolar solution of cetylpyridinium chloride and sodium by: Response of the separated flow to the long-wave oscillations generated by a local source of disturbances on the surface of the experimental model was clarified.

The low-frequency nonstationarity of the separation region leads to a growth of velocity fluctuations in the separated boundary layer, which dominate the laminar-turbulent transition and the state of the flow in the near-wall by: 3.

Stability and optimal control of time-periodic flows - application to a pulsed jet Léopold Shaabani-Ardali To cite this version: Léopold Shaabani-Ardali.

Stability and optimal control of time-periodic flows - application to a pulsed jet. Fluids mechanics [-ph]. Université Paris Saclay, English. telAuthor: Léopold Shaabani-Ardali.

The stability of oscillatory pipe flow is closely related to the stability of oscillatory Stokes layers, and of oscillatory channel flow. Instabilities in these flows were recorded by Blennerhasset and Bassom ( and ); in the latter, axisymmetric instability of oscillatory pipe flow.

Get this from a library. Instability of flows. [M Rahman;] -- "A state-of-the art analysis of studies in the field of instability of flows, this book contains chapters by leading experts in fluid mechanics.

The text brings together many important aspects of. This book presents older classical theories of hydrodynamic stability as well as new developments in nonlinear stability, achieved mostly in the last three decades. It is designed for use by researchers and graduate students, and the author follows a fluid mechanics and applied mathematics approach.

Emphasis is placed on realistic results Author: Daniel N. Riahi, Dan Riahi. It covers materials from classical instability to contemporary research areas including bluff body flow instability, mixed convection flows, and application areas of aerospace and other branches of engineering.

Transforms and perturbation techniques are used to link linear instability with receptivity of flows, as developed by the author. The book:Cited by: For more complicated spatially varying time-periodic flows, a similar type of instability can occur and is spatially localized near the most unstable positions.

When nonlinear effects are considered it is found that the instability modifies the steady streaming boundary layer induced by the oscillatory motion. The instability of two liquid layers with a free surface set in motion by an oscillatory lower boundary is analyzed for two superposed fluids with different viscosities and different densities.

There are two modes of wave motion: the interfacial and the free‐surface modes. When the Froude number is less than about 3, the interfacial mode governs the instability of the by: 4. The Stability of Time-Periodic Flows The Stability of Time-Periodic Flows Davis, S H x The stability of periodic states of mechanical systems has long been an object of study.

Dynamic stabilization and destabilization can lead to dramatic modifications of behavior depending on the proper tuning of the amplitude and frequency of the modulation.

A state-of-the art analysis of studies in the field of instability of flows, this book contains chapters by leading experts in fluid mechanics.

The text brings together many important aspects of flow instabilities and one of the primary aims of the contributors is to determine fruitful directions for future advanced studies and research.

The two surfaces of discontinuity are always in the phase for the free-surface mode of disturbance, but may be in phase or deg out of phase for the interfacial mode. The two modes, however, are found to compete with each other for governing the instability of the flow when the Froude number is larger than 3.

This volume is the collection of papers presented at the workshop on 'The Stability of Spatially Varying and Time Dependent Flows" sponsored by the Institute for Computer Applications in Science and Engineering (lCASE) and NASA Langley Research Center (LaRC) during August 23, The purpose.

theory of stability of time-periodic flows (see, for instance, Yih & Li i). Here, however, we shall replace (20) by a system of algebraic equations with constant or time-periodic coefficients, and proceed to find the characteristic values A, which are the magnification factors of 9 for ‘pure’ modes after one period of the primary by:.

The flows generated by the time-periodic forcing of one or both cylinders of the Taylor-Couette system are of two types: either modulated or pulsed flows whether or not there exists a .Instabilities are present in all natural fluids from rivers to atmospheres.

This book considers the physical processes that generate instability. Part I describes the normal mode instabilities most important in geophysical applications, including convection, shear instability and baroclinic by: 6.In this paper, the compressible magnetohydrodynamic system with some smallness and symmetry assumptions on the time periodic external force is considered in $\mathbb{R}^3$.

Based on the uniform estimates and the topological degree theory, we prove the existence of a time periodic solution in a bounded domain. Then by a limiting process, the result in the whole Cited by: 2.