Advances in Fluid Mechanics and Solid Mechanics

2020 ◽  
Keyword(s):  
Fluid Mechanics ◽  
Solid Mechanics

scholarly journals GEORGE KEITH BATCHELOR 8 March 1920–30 March 2000 Founding Editor, Journal of Fluid Mechanics, 1956

2000 ◽  
Vol 421 ◽  
pp. 1-14 ◽  
Author(s):  
HERBERT E. HUPPERT
Keyword(s):  
Fluid Mechanics ◽  
International Organizations ◽  
Solid Mechanics ◽  
Applied Mathematics ◽  
Fluid Flows ◽  
Theoretical Physics ◽  
Founding Editor ◽  
Number Of Factors ◽  
Quantitative Understanding ◽  
The Subject

George Batchelor was one of the giants of fluid mechanics in the second half of the twentieth century. He had a passion for physical and quantitative understanding of fluid flows and a single-minded determination that fluid mechanics should be pursued as a subject in its own right. He once wrote that he ‘spent a lifetime happily within its boundaries’. Six feet tall, thin and youthful in appearance, George's unchanging attire and demeanour contrasted with his ever-evolving scientific insights and contributions. His strongly held and carefully articulated opinions, coupled with his forthright objectivity, shone through everything he undertook.George's pervasive influence sprang from a number of factors. First, he conducted imaginative, ground-breaking research, which was always based on clear physical thinking. Second, he founded a school of fluid mechanics, inspired by his mentor G. I. Taylor, that became part of the world renowned Department of Applied Mathematics and Theoretical Physics (DAMTP) of which he was the Head from its inception in 1959 until he retired from his Professorship in 1983. Third, he established this Journal in 1956 and actively oversaw all its activities for more than forty years, until he relinquished his editorship at the end of 1998. Fourth, he wrote the monumental textbook An Introduction to Fluid Dynamics, which first appeared in 1967, has been translated into four languages and has been relaunched this year, the year of his death. This book, which describes the fundamentals of the subject and discusses many applications, has been closely studied and frequently cited by generations of students and research workers. It has already sold over 45 000 copies. And fifth, but not finally, he helped initiate a number of international organizations (often European), such as the European Mechanics Committee (now Society) and the biennial Polish Fluid Mechanics Meetings, and contributed extensively to the running of IUTAM, the International Union of Theoretical and Applied Mechanics. The aim of all of these associations is to foster fluid (and to some extent solid) mechanics and to encourage the development of the subject.

scholarly journals Breaking the Barriers

2012 ◽  
Vol 134 (05) ◽  
pp. 32-37
Author(s):  
Lee S. Langston
Keyword(s):  
Fluid Mechanics ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Solid Mechanics ◽  
Commercial Aircraft ◽  
Commercial Aviation ◽  
New Developments ◽  
Exhaust Heat ◽  
Turbine Component ◽  
Made In

This article explores the new developments in the field of gas turbines and the recent progress that has been made in the industry. The gas turbine industry has had its ups and downs over the past 20 years, but the production of engines for commercial aircraft has become the source for most of its growth of late. Pratt & Whitney’s recent introduction of its new geared turbofan engine is an example of the primacy of engine technology in aviation. Many advances in commercial aviation gas turbine technology are first developed under military contracts, since jet fighters push their engines to the limit. Distributed generation and cogeneration, where the exhaust heat is used directly, are other frontiers for gas turbines. Work in fluid mechanics, heat transfer, and solid mechanics has led to continued advances in compressor and turbine component performance and life. In addition, gas turbine combustion is constantly being improved through chemical and fluid mechanics research.

scholarly journals Preface, Plenary abstracts and the program of the RM50-seminar

2017 ◽  
Vol 50 (3) ◽  
pp. i-xv
Author(s):  
Reijo Kouhia
Keyword(s):  
Fluid Mechanics ◽  
Solid Mechanics ◽  
Time Constraint ◽  
Royal Institute ◽  
General Manager ◽  
Founding Editor ◽  
University Of Technology ◽  
Learned Societies ◽  
Mathematical Problems ◽  
Institute Of Technology

This issue contains papers of lectures presented at the journal’s 50-years anniversary seminar, at Vaasa University on 24-25 August 2017. The objective of this conference is to stimulate and promote research and applications within the area of solid mechanics, fluid mechanics and mathematical problems related to mechanics and especially to strengthen the collaboration between industry and academia. This kind of a seminar provides an ideal forum for researchers, designers, teachers and other professionals to network, discuss and share ideas and information. Sincere thanks go to all of the authors and participants for making the meeting a stimulating occasion. This issue contains abstracts of the five invited plenary talks and 57 peer reviewed extended abstracts. As a total, 72 talks will be given at the conference. The five invited plenary speakers are Dr. Pauli Jumppanen, the founding editor of the journal, Professor Claes Johnson from The Royal Institute of Technology, Sweden, Professor Anders Klarbring, Linköping University, Sweden, Professor Aki Mikkola, Lappeenranta University of Technology and General Manager, Analysis, Hannu Tienhaara, Wärtsilä Finland Oy. Especially, thanks to all of our collaborators: Wärtsilä Finland Oy, ABB Oy, AGCO POWER, Avant Tecno Oy, Comsol Oy, EDR&Medeso, Federation of Finnish Learned Societies, FEMdata, Finnish Association of Civil Engineers RIL, Global Boiler Works Oy, Pressus Oy, Ramboll Finland Oy, Valmet Oyj and Vertex Systems Oy, whose support was indispensable for the organisation of this conference. Finally, we thank all the reviewers for their important anonymous contribution under a very strict time constraint. August 2017 Editors

Dynamics of the ice-age Earth: Solid mechanics and fluid mechanics

2002 ◽  
Vol 12 (10) ◽  
pp. 85-104 ◽  
Author(s):  
W. R. Peltier ◽  
L. P. Solheim
Keyword(s):  
Fluid Mechanics ◽  
Solid Mechanics ◽  
Ice Age

scholarly journals George Keith Batchelor. 8 March 1920 – 30 March 2000

2002 ◽  
Vol 48 ◽  
pp. 25-41 ◽  
Author(s):  
H.K. Moffatt
Keyword(s):  
Fluid Dynamics ◽  
Fluid Mechanics ◽  
European Society ◽  
Solid Mechanics ◽  
Trinity College ◽  
Applied Mathematics ◽  
Great Influence ◽  
Theoretical Physics ◽  
The Subject ◽  
Suspension Mechanics

George Batchelor was a pioneering figure in two branches of fluid dynamics: turbulence, in which he became a world leader over the 15 years from 1945 to 1960; and suspension mechanics (or ‘microhydrodynamics’), which developed under his initial impetus and continuing guidance throughout the 1970s and 1980s. He also exerted great influence in establishing a universally admired standard of publication in fluid dynamics through his role as founder Editor of the Journal of Fluid Mechanics , the leading journal of the subject, which he edited continuously over four decades. His famous textbook, An introduction to fluid dynamics , first published in 1967, showed the hand of a great master of the subject. Together with D. Küchemann, F.R.S., he established in 1964 the European Mechanics Committee (forerunner of the present European Society for Mechanics), which over the 24-year period of his chairmanship supervised the organization of no fewer than 230 European Mechanics Colloquia spanning the whole field of fluid and solid mechanics; while within Cambridge, where he was a Fellow of Trinity College and successively Lecturer, Reader and Professor of Applied Mathematics, he was an extraordinarily effective Head of the Department of Applied Mathematics and Theoretical Physics from its foundation in 1959 until his retirement in 1983.

On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor

2015 ◽  
Author(s):  
Per Johansen ◽  
Daniel B. Roemer ◽  
Torben O. Andersen ◽  
Henrik C. Pedersen
Keyword(s):  
Fluid Mechanics ◽  
Multibody Dynamics ◽  
Solid Body ◽  
Parametric Analysis ◽  
Solid Mechanics ◽  
Force Balance ◽  
Body Motion ◽  
Fluid Power ◽  
Inertia Term ◽  
Operating Modes

In the past three decades an increasing amount of research has been performed in the field of tribodynamics of fluid power pumps and motors. The main incentives for this research are optimization of reliability and efficiency through the study of loss and wear mechanisms. These mechanisms are very difficult to study experimentally, whereby modeling and simulation are necessary. The modeling of tribodynamics is a multiphysics problem involving multibody dynamics, fluid mechanics, thermodynamics and solid mechanics. Consequently, the simulation durations can easily become impractical for parametric analysis or optimization. The coupling between multibody dynamics and fluid mechanics depend on the formulation of the solid body motion equations, where two approaches have historically been used. One approach is where the external forces on any lubricated joint are balanced by the fluid forces, such that solid body inertia is neglected. The other approach includes the inertia terms in the calculation of microdynamics. The inclusion of inertia terms entails a need for smaller time steps in comparison to the force balance approach, wherefore it is of interest to analyze the influence of the inertia term. In this paper the influence of the inertia term on the lubrication gaps of a radial piston motor are studied by a parametric analysis of the piston and cylinder density in a multibody tribodynamic simulation model. The motor is modeled as a digital fluid power displacement machine and a series of full-stroke displacement simulations are used as basis for the parametric analysis. From the parametric analysis a change, in the minimum film thickness as function of piston and cylinder density, is shown for certain operating modes of the digital fluid power displacement motor. This indicate a need for careful assessment of the applicability, of the force balance condition, if it is used in multibody tribodynamic simulations of radial piston digital fluid power displacement motors.

The Use of Second Order System Equation in the Micro Electro Mechanical System (MEMS) Education

2004 ◽  
Author(s):  
Haifeng Dong ◽  
Haixia Zhang ◽  
Yilong Hao
Keyword(s):  
Fluid Mechanics ◽  
Mechanical System ◽  
Solid Mechanics ◽  
Teaching Method ◽  
Micro Electro Mechanical System ◽  
Second Order ◽  
Order System ◽  
Disciplinary Knowledge ◽  
Knowledge Domain ◽  
System Equation

A major challenge in Micro Electro Mechanical System (MEMS) education, is dealing with the multi-disciplinary nature of the field, which may include solid mechanics, fluid mechanics, electronics etc. Instead of teaching these subjects independently, we link this multi-disciplinary knowledge domain by the second-order system equation. In addition, the related CAD software is introduced during the explanation of the second order system equation. This teaching method makes the student understand MEMS more quickly and systemically, and if needed, they can seek the related knowledge and study further on their own.

Leakage Rates Through Complex Crack Paths Using an ODE Method

2015 ◽  
Author(s):  
Peter Gill ◽  
John Sharples ◽  
Peter Budden
Keyword(s):  
Fluid Mechanics ◽  
Gas Flow ◽  
Solid Mechanics ◽  
Integration Scheme ◽  
Test Case ◽  
Crack Shape ◽  
Ode Method ◽  
Complex Crack ◽  
The One ◽  
Isothermal Gas

The geometry of a crack is a fundamental consideration when calculating leakage rates for Leak-before-Break assessments. Carrying out fluid mechanics calculations does not give any additional benefit if there is not enough information on the crack shape. To address this issue, work is being carried out under the R6 development programme to derive a model that couples fluid mechanics and solid mechanics. The aim is to combine complex crack shapes with relatively simple fluid mechanics models and compare with experimental data. Then, the model can be extended to examine various stress distributions, and give indications as to how conservative are the current models. The model is a development of the one presented in a previous PVP paper (Reference 1), and a special case of isothermal gas flow is considered, where the equations reduce to an Ordinary Differential Equation (ODE). This is solved using a Runge-Kutta integration scheme in MATHCAD. A test case is presented based on the crack geometries considered in experiments, and upon comparison with numerical results; it is clear that choosing the correct crack shape is crucial in obtaining accurate predictions of leak rate. The assumed crack openings are rectangular, diamond or elliptical. In addition to this, weld residual stress profiles are postulated, based on experience of welds in piping components. Comparing the numerical simulations with the simplified DAFTCAT model indicates that the more precise ODE method can reduce conservatism in calculation of leak rates.

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