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Ludwig Prandtl - A personal biography drawn from memories and correspondence

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Book Series: Göttinger Klassiker der Strömungsmechanik ISBN: 9783863951603 Year: Pages: 247 DOI: 10.17875/gup2014-769 Language: English
Publisher: Universitätsverlag Göttingen
Subject: Agriculture (General) --- Mathematics --- History
Added to DOAB on : 2014-12-06 11:01:22
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When Ludwig Prandtl took up the Chair of Applied Mechanics at Göttingen University in 1904, the small university town became the cradle of modern fluid mechanics and aerodynamics. Not only did Prandtl found two research institutions of worldwide renown, the Aerodynamische Versuchsanstalt (AVA) and the Kaiser-Wilhelm-Institut für Strömungsforschung, but with the so-called ‘Göttingen School’ he also established an exceptionally fertile line of scientific thinking, unique for its special balance of intuition for physics and mathematical precision. The scientific methods developed by Prandtl and his pupils are manifested in numerous dissertations, monographs and textbooks that now rate as classics and hence belong to the fundamental works on fluid mechanics. Yet many of these publications have long been out of print and inaccessible for study. The series Göttinger Klassiker der Strömungsmechanik is thus making available selected publications that emerged from Ludwig Prandtl’s ‘Göttingen School’ or stand in a particular historical relationship to it. This highly personal biography of Ludwig Prandtl compiled by his daughter, Johanna Vogel-Prandtl, is complemented by numerous photographs depicting Prandtl’s working and private life. It completes the picture of the founding father of modern fluid mechanics whose scientific importance continues to resonate to this day.

The Fluid Dynamic Basis for Actuator Disc and Rotor Theories

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ISBN: 9781614998655 9781614998662 Year: Pages: 148 DOI: 10.3233/978-1-61499-866-2-i Language: English
Publisher: IOS Press
Subject: Mechanics --- Physics (General)
Added to DOAB on : 2018-06-20 14:48:14
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The first rotor performance predictions were published by Joukowsky exactly 100 years ago. Although a century of research has expanded the knowledge of rotor aerodynamics enormously, and modern computer power and measurement techniques now enable detailed analyses that were previously out of reach, the concepts proposed by Froude, Betz, Joukowsky and Glauert for modelling a rotor in performance calculations are still in use today, albeit with modifications and expansions.This book is the result of the author's curiosity as to whether a return to these models with a combination of mathematics, dedicated computations and wind tunnel experiments could yield more physical insight and answer some of the old questions still waiting to be resolved. Although most of the work included here has been published previously, the book connects the various topics, linking them in a coherent storyline.This book will be of interest to those working in all branches of rotor aerodynamics – wind turbines, propellers, ship screws and helicopter rotors. It has been written for proficient students and researchers, and reading it will demand a good knowledge of inviscid (fluid) mechanics.Jens Nørkær Sørensen, DTU, Technical University of Denmark: “(…) a great piece of work, which in a consistent way highlights many of the items that the author has worked on through the years. All in all, an impressive contribution to the classical work on propellers/wind turbines.” Peter Schaffarczyk, Kiel University of Applied Sciences, Germany: “(…) a really impressive piece of work!”Carlos Simão Ferreira, Technical University Delft: “This is a timely book for a new generation of rotor aerodynamicists from wind turbines to drones and personal air-vehicles. In a time where fast numerical solutions for aerodynamic design are increasingly available, a clear theoretical and fundamental formulation of the rotor-wake problem will help professionals to evaluate the validity of their design problem. ‘The Fluid Dynamic Basis for Actuator Disc and Rotor Theories’ is a pleasure to read, while the structure, text and figures are just as elegant as the theory presented.”The cover shows ‘The Red Mill’, by Piet Mondriaan, 1911, collection Gemeentemuseum Den Haag. Cover image: © 2018 Mondrian/Holtzman Trust.

Keywords

rotor aerodynamics --- modelling --- Joukowsky --- Froude --- Betz --- Glauert

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.

Advances in Gas Turbine Technology

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ISBN: 9789533076119 Year: Pages: 540 DOI: 10.5772/664 Language: English
Publisher: IntechOpen
Subject: Transportation
Added to DOAB on : 2019-10-03 07:51:48

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Gas turbine engines will still represent a key technology in the next 20-year energy scenarios, either in stand-alone applications or in combination with other power generation equipment. This book intends in fact to provide an updated picture as well as a perspective vision of some of the major improvements that characterize the gas turbine technology in different applications, from marine and aircraft propulsion to industrial and stationary power generation. Therefore, the target audience for it involves design, analyst, materials and maintenance engineers. Also manufacturers, researchers and scientists will benefit from the timely and accurate information provided in this volume. The book is organized into five main sections including 21 chapters overall: (I) Aero and Marine Gas Turbines, (II) Gas Turbine Systems, (III) Heat Transfer, (IV) Combustion and (V) Materials and Fabrication.

Turbulence Modelling Approaches - Current State, Development Prospects, Applications

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ISBN: 9789535133490 9789535133506 Year: Pages: 250 DOI: 10.5772/65527 Language: English
Publisher: IntechOpen
Subject: Transportation
Added to DOAB on : 2019-10-03 07:51:50

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Accurate prediction of turbulent flows remains a challenging task despite considerable work in this area and the acceptance of CFD as a design tool. The quality of the CFD calculations of the flows in engineering applications strongly depends on the proper prediction of turbulence phenomena. Investigations of flow instability, heat transfer, skin friction, secondary flows, flow separation, and reattachment effects demand a reliable modelling and simulation of the turbulence, reliable methods, accurate programming, and robust working practices. The current scientific status of simulation of turbulent flows as well as some advances in computational techniques and practical applications of turbulence research is reviewed and considered in the book.

Aerial Robots - Aerodynamics, Control and Applications

Authors: ---
ISBN: 9789535134633 9789535134640 Year: Pages: 194 DOI: 10.5772/65604 Language: English
Publisher: IntechOpen
Subject: Transportation
Added to DOAB on : 2019-10-03 07:51:50

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Few years ago, the topic of aerial robots was exclusively related to the robotics community, so a great number of books about the dynamics and control of aerial robots and UAVs have been written. As the control technology for UAVs advances, the great interaction that exists between other systems and elements that are as important as control such as aerodynamics, energy efficiency, acoustics, structural integrity, and applications, among others has become evident. Aerial Robots - Aerodynamics, Control, and Applications is an attempt to bring some of these topics related to UAVs together in just one book and to look at a selection of the most relevant problems of UAVs in a broader engineering perspective.

Hypersonic Vehicles - Past, Present and Future Developments

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ISBN: 9781839622694 9781839622700 9781839622717 Year: Pages: 148 DOI: 10.5772/intechopen.79515 Language: English
Publisher: IntechOpen
Subject: Transportation
Added to DOAB on : 2019-10-03 07:51:53

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In the aviation field there is great interest in high-speed vehicle design. Hypersonic vehicles represent the next frontier of passenger transportation to and from space. However, several design issues must be addressed, including vehicle aerodynamics and aerothermodynamics, aeroshape design optimization, aerodynamic heating, boundary layer transition, and so on. This book contains valuable contributions focusing on hypervelocity aircraft design. Topics covered include hypersonic aircraft aerodynamic and aerothermodynamic design, especially aeroshape design optimization, computational fluid dynamics, and scramjet propulsion. The book also discusses high-speed flow issues and the challenges to achieving the dream of affordable hypersonic travel. It is hoped that the information contained herein will allow for the development of safe and efficient hypersonic vehicles.

Wind Tunnels and Experimental Fluid Dynamics Research

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ISBN: 9789533076232 Year: Pages: 726 DOI: 10.5772/730 Language: English
Publisher: IntechOpen
Subject: Transportation
Added to DOAB on : 2019-10-03 09:47:08

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The book ""Wind Tunnels and Experimental Fluid Dynamics Research"" is comprised of 33 chapters divided in five sections. The first 12 chapters discuss wind tunnel facilities and experiments in incompressible flow, while the next seven chapters deal with building dynamics, flow control and fluid mechanics. Third section of the book is dedicated to chapters discussing aerodynamic field measurements and real full scale analysis (chapters 20-22). Chapters in the last two sections deal with turbulent structure analysis (chapters 23-25) and wind tunnels in compressible flow (chapters 26-33). Contributions from a large number of international experts make this publication a highly valuable resource in wind tunnels and fluid dynamics field of research.

Investigation of flow and pressure characteristics around pyramidal buildings

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Book Series: Dissertationsreihe am Institut für Hydromechanik der Universität Karlsruhe (TH) ISSN: 14394111 ISBN: 3937300724 Year: Volume: 2005,3 Pages: XVI, 138 p. DOI: 10.5445/KSP/1000003455 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: General and Civil Engineering
Added to DOAB on : 2019-07-30 20:02:00
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Pyramidal buildings are undergoing a renaissance in todays architectural design due to their attractive mystery that has fascinated many architects. From an aerodynamic engineering point of view, structural buildings with the shape of a pyramid have their own interesting and particular aerodynamic characteristics as compared to other usual structural buildings (i.e. cuboidal).However, despite its distinct aerodynamic characteristics compared to other usual structural buildings, the flow and pressure characteristics around pyramidal structures have not yet been investigated completely. Very limited studies about pyramidal buildings can be found in the literature.Consequently, the technical layout with respect to wind load assumption of pyramidal buildings are usually not listed in standard tables which underlines the need of systematic investigations for pyramidal structures.In this study, pyramids with a wide range of base angle variation (theta = 30°, 40°, 45°, 50°, 55°, 60°, 70°) have been investigated intensively through a detailed and accurate laboratory experiments at the Laboratory of Building- and Environmental Aerodynamics, Institute for Hydromechanics, at the University of Karlsruhe. The flow measurements were performed using a 2-D Laser Doppler anemometry (LDA) and The pressure measurements were carried out using a standard pressure tapping technique. The present study focuses on the most important parameters affecting the flow and pressure characteristics that include the influence of base angles, the influence of wind directions and the influence of the pyramid heights with respect to a characteristic length. Besides the experimental investigations, numerical investigations with the aid of a software package called FLOVENT were also additionally performed in order to prove, whether experimental and numerical studies deliver the same results.Based on the flow measurement results, this study was able to distinguish the general characteristics of flow around pyramid building when compared to other type of structures (i.e. cuboidal structure). A set of equations to calculate the reattachment length at the leeward side of the pyramid was generated. In addition, an equation to estimate the zero streamline and an area below line as a function of the reattachment length and base angle, respectively, are proposed. These equations will illustrate the recirculation zone at the leeward side of the pyramid.The pressure measurement results show that the three investigated parameters (base angle, wind direction and pyramid height) have an important influence to the pressure characteristics (magnitude of pressure, suction and fluctuation) in the surfaces of the pyramids. For practical purposes, this study was able to provide the typical values of pressure and aerodynamic coefficients for pyramidal buildings that can be used for structural calculations. The values that are given in this study can be used to fill in the gap of the unavailable design values for pyramidal buildings in standard tables.

Large-Scale and Full-Scale Methods for Examining Wind Effects on Buildings

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Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889455102 Year: Pages: 143 DOI: 10.3389/978-2-88945-510-2 Language: English
Publisher: Frontiers Media SA
Subject: General and Civil Engineering --- Environmental Engineering
Added to DOAB on : 2019-01-23 14:53:42
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Global economic losses due to severe weather events have grown dramatically over the past two decades. A large proportion of these losses are due to severe wind storms such as tropical cyclones and tornadoes, which can cause destruction to buildings, houses, and other infrastructure over large areas. To address the growing losses, many new large-scale and full-scale laboratories have been developed. These tools are used to examine the issues that could not be solved with the traditional tools of wind engineering including model-scale boundary layer wind tunnels, simplified standardized product tests, and other methods of analysis. This book presents state-of-the-art results from the development of the many novel approaches being used to mitigate natural disasters around the world.

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