large eddy simulation in hydraulics

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Large Eddy Simulation In Hydraulics

Author : Wolfgang Rodi
ISBN : 9780203797570
Genre : Technology & Engineering
File Size : 41. 27 MB
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Large-Eddy Simulation (LES), which is an advanced eddy-resolving method for calculating turbulent flows, is used increasingly in Computational Fluid Dynamics, also for solving hydraulics and environmental flow problems. The method has generally great potential and is particularly suited for problems dominated by large-scale turbulent structures. This book gives an introduction to the LES method specially geared for hydraulic and environmental engineers. Compared with existing books on LES it is less theoretically and mathematically demanding and hence easier to follow, and it covers special features of flows in water bodies and summarizes the experience gained with LES for calculating such flows. The book was written primarily as an introduction to LES for hydraulic and environmental engineers, but it will also be very useful as an entry to the subject of LES for researchers and students in all fields of fluids engineering. The applications part will further be useful to researchers interested in the physics of flows governed by the dynamics of coherent structures.

Large Eddy Simulations Of Turbulence

Author : M. Lesieur
ISBN : 0521781248
Genre : Mathematics
File Size : 65. 47 MB
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Large-Eddy Simulations of Turbulence is a reference for LES, direct numerical simulation and Reynolds-averaged Navier-Stokes simulation.

Direct And Large Eddy Simulation Viii

Author : Hans Kuerten
ISBN : 9789400724822
Genre : Computers
File Size : 28. 81 MB
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This volume continues previous DLES proceedings books, presenting modern developments in turbulent flow research. It is comprehensive in its coverage of numerical and modeling techniques for fluid mechanics. After Surrey in 1994, Grenoble in 1996, Cambridge in 1999, Enschede in 2001, Munich in 2003, Poitiers in 2005, and Trieste in 2009, the 8th workshop, DLES8, was held in Eindhoven, The Netherlands, again under the auspices of ERCOFTAC. Following the spirit of the series, the goal of this workshop is to establish a state-of-the-art of DNS and LES techniques for the computation and modeling of transitional/turbulent flows covering a broad scope of topics such as aerodynamics, acoustics, combustion, multiphase flows, environment, geophysics and bio-medical applications. This gathering of specialists in the field was a unique opportunity for discussions about the more recent advances in the prediction, understanding and control of turbulent flows in academic or industrial situations.

Elements Of Direct And Large Eddy Simulation

Author : Bernard Geurts
ISBN : 1930217072
Genre : Technology & Engineering
File Size : 24. 13 MB
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Geurts (U. of Twente) explains direct and large-eddy simulations of turbulent flow, focusing on how to capture the primary features of unsteady flow through computation rather than on a complete statistical modeling. The approach incorporates elements of numerical and mathematical-physical modeling.

Users Guide To Physical Modelling And Experimentation

Author : Lynne E. Frostick
ISBN : 9780415609128
Genre : Technology & Engineering
File Size : 79. 73 MB
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A Users Guide to Hydraulic Modelling and Experimentation provides a systematic, comprehensive summary of the progress made through HYDRALAB III . The book combines the expertise of many of the leading hydraulic experimentalists in Europe and identifies current best practice for carrying out state-of-the-art, modern laboratory investigations. In addition it gives an inventory and reviews recent advances in instrumentation and equipment that drive present and new developments in the subject. The Guide concentrates on four core areas – waves, breakwaters, sediments and the relatively-new (but rapidly-developing) cross-disciplinary area of hydrodynamics/ecology. Progress made through the ‘CoMIBBS’ component of HYDRALAB III provides the material for a chapter focussed on guidance, principles and practice for composite modelling. There is detailed consideration of scaling and the degree of relevance of laboratory/physical modelling approaches for specific contexts included in each of the individual chapters. The Guide includes outputs from the workshops and several of the innovative transnational access projects that have been supported within HYDRALAB III, as well as the focussed joint research activities SANDS and CoMIBBS. Its primary purpose is to serve as a shared resource to disseminate the outstanding advances achieved within HYDRALAB III but, even more than this, it is a tribute to the human and institutional collaborations that led to and sustained the research advances, the human relationships that were strengthened and initiated through joint participation in the Programme, and the training opportunities that participation provided to the many young researchers engaged in the projects.

Turbulence Off The Coast Of Oregon A Large Eddy Simulation Study Modeling Of The Atmospheric Circulation In The Santa Barbara Channel

Author :
ISBN : OCLC:946241075
Genre :
File Size : 78. 31 MB
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Two projects were completed under this grant. The first project examined how coastal terrain interacts with prevailing winds along the southern California coastline. We determined that under northwest flow, wind fields followed a systematic pattern governed by basic hydraulic flow theory. Land surface heating disrupted this pattern during the night by forcing an offshore flow, thereby creating regions of weak winds over the Santa Barbara Channel. Our second project examined how turbulence is forced in the coastal ocean. We utilized a large-eddy simulation model to examine how turbulence is forced by current motions over bottom terrain features and by frontal zones. Model results show that relatively small bottom features can drive large internal wave momentum flux, forcing a current drag that does not rely on active turbulence and is therefore not present in current turbulence parameterizations. We evaluated a set of three turbulence parameterizations in a coastal ocean model and determined that each model produced consistent results except near frontal zones during down welling events.

Direct And Large Eddy Simulation I

Author : Peter R. Voke
ISBN : 0792331060
Genre : Technology & Engineering
File Size : 30. 4 MB
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It is a truism that turbulence is an unsolved problem, whether in scientific, engin eering or geophysical terms. It is strange that this remains largely the case even though we now know how to solve directly, with the help of sufficiently large and powerful computers, accurate approximations to the equations that govern tur bulent flows. The problem lies not with our numerical approximations but with the size of the computational task and the complexity of the solutions we gen erate, which match the complexity of real turbulence precisely in so far as the computations mimic the real flows. The fact that we can now solve some turbu lence in this limited sense is nevertheless an enormous step towards the goal of full understanding. Direct and large-eddy simulations are these numerical solutions of turbulence. They reproduce with remarkable fidelity the statistical, structural and dynamical properties of physical turbulent and transitional flows, though since the simula tions are necessarily time-dependent and three-dimensional they demand the most advanced computer resources at our disposal. The numerical techniques vary from accurate spectral methods and high-order finite differences to simple finite-volume algorithms derived on the principle of embedding fundamental conservation prop erties in the numerical operations. Genuine direct simulations resolve all the fluid motions fully, and require the highest practical accuracy in their numerical and temporal discretisation. Such simulations have the virtue of great fidelity when carried out carefully, and repre sent a most powerful tool for investigating the processes of transition to turbulence.

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