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Flow control : theoretical concept of absolute instability

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ISBN: 9783866445314 Year: Pages: 97 p. DOI: 10.5445/KSP/1000016554 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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At the 37th Prandtl memorial lecture on Regions of Viccous Flow, H.Oertel 1994 developed for the first time the stability theory of local perturbations in boundary layers and wake flows, as well as their practical application in the flow control of vehicle flows and the boundary layer of civil aircraft wings.This work presents how the stability theory concept of absolute instability has advanced and proven in practice in the last 15 years in terms of the efficient flow control.

Across the Oceans: Development of the overseas business information transmission

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Book Series: Studia Fennica Historica ISBN: 9789517469043 9789522228086 9789522228093 Year: Pages: 459 DOI: 10.21435/sfh.13 Language: English
Publisher: Finnish Literature Society / SKS Grant: Jane and Aatos Erkko Foundation grant and SKS
Subject: History
Added to DOAB on : 2016-09-27 11:01:24
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"In the early 19th century, the only way to transmit information was to send letters across the oceans by sailing ships or across land by horse and coach. Growing world trade created a need and technological development introduced options to improve general information transmission. Starting in the 1830s, a network of steamships, railways, canals and telegraphs was gradually built to connect different parts of the world. The book explains how the rate of information circulation increased many times over as mail systems were developed. Nevertheless, regional differences were huge. While improvements on the most significant trade routes between Europe, the Americas and East India were considered crucial, distant places such as California or Australia had to wait for gold fever to become important enough for regular communications. The growth of passenger services, especially for emigrants, was a major factor increasing the number of mail sailings. The study covers the period from the Napoleonic wars to the foundation of the Universal Postal Union (UPU) and includes the development of overseas business information transmission from the days of sailing ships to steamers and the telegraph."

Turbulent open channel flow, sediment erosion and sediment transport

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Book Series: Dissertationsreihe am Institut für Hydromechanik des Karlsruher Instituts für Technologie / Karlsruher Institut für Technologie (KIT), Institut für Hydromechanik ISSN: 14394111 ISBN: 9783866449008 Year: Volume: 2012,1 Pages: XXXII, 154 p. DOI: 10.5445/KSP/1000029253 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:01:58
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This thesis aims to contribute to a better understanding of turbulent open channel flow, sediment erosion and sediment transport. The thesis provides an analysis of high-fidelity data from direct numerical simulation of (i) open channel flow over an array of fixed spheres, (ii) open channel flow with mobile eroding spheres, (iii) open channel flow with sediment transport of many mobile spheres. An immersed boundary method is used to resolve the finite-size particles.

Modelling the bird flight : Scientific Report 2007-2010

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ISBN: 9783866447615 Year: Pages: 44 p. DOI: 10.5445/KSP/1000020294 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:00
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The aerodynamics of flying birds and insects plays a crucial role in the domain of aeronautical engineering. The energy-efficient construction of winglets for airplanes, the formation flight of tactical aircraft or the drone engineering or military applications are inspired by birds. This holds also for flow and structure simulation of flapping wing motion, taking the unsteady aerodynamics and corresponding wing deformations into account at high flow velocities and flapping frequencies.

Hydrodynamic processes at the water-sediment interface of streambeds

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Book Series: Dissertationsreihe am Institut für Hydromechanik der Universität Karlsruhe / Universität Karlsruhe (TH), Institut für Hydromechanik ISSN: 14394111 ISBN: 9783866442443 Year: Volume: 2008/1 Pages: IV, 153 p. DOI: 10.5445/KSP/1000008267 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:02:00
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Simultaneous 2D pressure and 2D velocity information at the rough water-sediment interface of streambeds were gained by a newly developed measurement setup. In the bed the pressure fluctuations decay exponentially within the first 1-2 equivalent sand roughnesses. Structural findings concerning coherent flow structures are consistent with models originally developed for smooth walls. A significant bed destabilizing flow-pressure pattern was identified for the first time.

Modelling the human cardiac fluid mechanics. 3rd ed

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ISBN: 9783866443570 Year: Pages: 80 p. DOI: 10.5445/KSP/1000011015 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:01
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The third edition of this article on the modelling and simulation of the flow in human hearts supplements earlier editions. It discusses the flow-structure coupled heart model KAHMO FSI (Karlsruhe Heart Model) and examines patient-specific clinical application of the heart model for cardiac surgery. The KAHMO heart model can be used to predict flow losses and flow structures due to pathalogical ventricle defects. These are considered before and after surgery.

The Second World War, Vol. 3

Authors: --- ---
Book Series: Essential Histories ISBN: 9780203498828 9780415968478 9781135882587 9781135882570 9781135882532 Year: DOI: 10.4324/9780203498828 Language: English
Publisher: Taylor & Francis
Subject: Sociology --- History --- Social Sciences
Added to DOAB on : 2019-11-08 11:21:07
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This volume provides a comprehensive guide to three major theaters of combat: the Atlantic, the Mediterranean, and the Indian Ocean. The war at sea was a critical contest, as sea-lanes provided the logistical arteries for British and subsequent Allied armies fighting on the three continents of Africa, Asia, and Europe. Land forces ultimately won World War II, but the battles at sea fundamentally altered the balance of military power on the ground.

Keywords

royal --- navy --- merchant --- ships --- german --- scapa --- flow --- graf --- spee --- surface

Shallow turbulent wake flows: momentum and mass transfer due to large-scale coherent vortical structures

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Book Series: Dissertationsreihe am Institut für Hydromechanik der Universität Karlsruhe (TH) ISSN: 14394111 ISBN: 3937300635 Year: Volume: 2005,2 Pages: XXVI, 398 p. DOI: 10.5445/KSP/1000003453 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:01:59
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Shallow turbulent wake flows are generated by large obstacles - like islands or headlands - introduced to shallow turbulent open-channel flows. Large-scale quasi two-dimensional vortices may shed off from an obstacle, and advect downstream in a vertical shear flow with predominantly small-scale turbulence induced by bottom friction. Experimental, analytical, and numerical techniques are employed in the present study to characterize the mean flow and turbulence properties of shallow wakes; mechanisms of generation and decay of large-scale vortical structures are clarified, as is their influence on momentum and mass transport in shallow wakes; the global and local stability of shallow wakes is analyzed and evidenced from experimental data. Part I of this work covers non-intrusive optical measurement techniques especially adapted to investigate shallow shear flows. Flow velocities and mass concentrations are obtained (i) point-wise with high spatiotemporal resolution using a combinded LDV-LIF system, and (ii) field-wise using near-surface PIV and depth-averaged PCA systems with a coupling by phase-resolved averaging. Improved algorithms for the evaluation of mass concentrations are based on hydro-optical models of the underlying fluorescence and light attenuation processes. Part II addresses the time-mean description of shallow wake flows. The stochastic description of the turbulence fields displays a characteristic spectral distribution both of kinetic energy and of mass variance, which is partially consistent with the theory of unbounded 2D turbulence at large scales, and with the theory of homogeneous 3D turbulence at small scales. An integral wake model including the effect of bottom friction is derived analytically, and is validated by experimental data. The time-mean distributions of flow velocities and of mass concentration allow to identify wake near fields and far fields with specific asymptotic wake developments. Wake stability classes are associated with local stability regions suggested by linear stability analyses. Part III elaborates the structure and dynamics of quasi-periodic wake flows and the significance of large-scale eddies. This involves a structure identification scheme to educe individual vortices, and a phase-resolved averaging procedure to decompose the flow fields into large-scale coherent and small-scale turbulent parts. A Numerical Particle Tracking technique is employed to model the mass transport and to elucidate different diffusion and dispersion effects.

Enabling Positive Change. Flow and Complexity in Daily Experience

Authors: --- ---
ISBN: 9783110410242 9783110439472 Year: Pages: 210 DOI: 10.2478/9783110410242 Language: English
Publisher: De Gruyter
Subject: Psychology
Added to DOAB on : 2015-04-13 10:50:20
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Personal psychological growth: Why are some people able to promote their own psychological growth (bold tag) and change toward complexity while others not? Is it possible to propose simple methodologies and instruments that would allow selection of positive experiences and hence develop a stronger and richer Self? This book describes the way to promote and foster positive psychological growth in everyday life, through simple instruments accessible to anyone. Positive psychological experience: The focal point of the approach is the concept of Flow of Consciousness, an experience of subjective psychological wellbeing that nourishes and complexifies the Self. The authors propose a wide overview of positive psychological experience (bold tag) considering individual characteristics and experiences, as well as the influence of context, culture and social relationship, and the effects of the immersion in a globalized world, like the increasing daily use of mediated communication technologies. In the various chapters, this conceptual frame is declined in different areas of research, either consolidated ones or new fields. Self-development tips: In a fresh and engaging style, the book transports the readers in a world of situations and opportunities through which they can identify themselves in a positive and stable self-development (bold tag) process. In the first two chapters the authors describe the impact of positive psychological experience in social and individual life. In the following chapters the reader discovers, accompanied by the exposition of concrete research results, the specific characteristics that may promote flow experience in several field of experience: the use of communication technology; the experience of social-networks; clinical settings and Psychotherapy; the psychological relation with environment, politics and social participation, school, sports, family business, mentor's influence, and the perception of quality of life in daytime. Everyday opportunities: This opportunity of interacting with different and various kinds of experiences, that may appear dispersive, will on the contrary bring the reader - who may choose this book both for professional or personal reasons - to understand the concept of personal psychological growth in the wider and more concrete perspective, and to comprehend which personal skills he may bring into play in order to improve his personality and his daily experience.

Heat Transfer Processes in Oscillatory Flow Conditions

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ISBN: 9783038427094 9783038427100 Year: Pages: VI, 172 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Heat
Added to DOAB on : 2018-04-27 16:01:54
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Heat exchange processes in steady flows have been studied extensively over the last two hundred years, and are now a part of undergraduate syllabi in most engineering courses. However, heat transfer processes in oscillatory flow conditions are still not very well understood. Their importance is well recognized in applications including Stirling machines, thermoacoustic engines, and refrigerators or pulsed-tube coolers in cryogenics. Additionally, the enhancement of heat transfer by using oscillatory, and, in some cases, pulsating flows is important in many areas of mechanical and chemical engineering for the intensification of heat transfer processes and possible miniaturization of heat exchangers of the future.This Special Issue was intended as a dissemination platform for researchers working in the field to have an opportunity to consolidate recent advances in this important research area. All types of research approaches were invited, including experimental, theoretical, computational fluid dynamics (CFD), and their combinations, while the approaches could be either of a fundamental or applied nature. The guest editor and the editorial team of Applied Sciences hope that the readership will find the selection of ten articles presented here a useful contribution to the emerging field of heat transfer processes in oscillatory flow conditions.

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