Application Of Direct And Large Eddy Simulation To Transition And Turbulence Lapplication De La Simulation Directe Et De La Simulation Des Gros Tourbillons A La Transition Et A La Turbulence Conference Proceedings On Fluid Dynamics Held At Chania Crete Greece In April 1994
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Author | : |
Publisher | : |
Total Pages | : 400 |
Release | : 1994 |
Genre | : |
ISBN | : |
The papers prepared for the AGARD Fluid Dynamics Panel (FDP) Symposium on Application of Direct and Large Eddy Simulation to Transition and Turbulence", which was held 18-21 April 1994 in Chania, Crete, Greece are contained in this report. In addition, a Technical Evaluator's Report aimed at assessing the success of the Symposium in meeting its objectives, and an edited transcript of the General Discussion held at the end of the meeting are also included. During the past two decades significant progress has been made in the numerical simulation of turbulent flows. Vast improvements in speed and memory size of modern supercomputers, and recent progress in simulation algorithms and parallel computation have put us on the threshold of being able to simulate flows in configurations of engineering interest. The purpose of this Symposium is to disseminate the accumulated experience in this fast moving field which can be expected to play a vital role in future aeronautical developments.
Author | : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development |
Publisher | : |
Total Pages | : 422 |
Release | : 1994 |
Genre | : Aerodynamics |
ISBN | : |
Author | : M. Lesieur |
Publisher | : Cambridge University Press |
Total Pages | : 240 |
Release | : 2005-08-22 |
Genre | : Mathematics |
ISBN | : 9780521781244 |
Large-Eddy Simulations of Turbulence is a reference for LES, direct numerical simulation and Reynolds-averaged Navier-Stokes simulation.
Author | : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development |
Publisher | : |
Total Pages | : |
Release | : 1994 |
Genre | : Aeronautics |
ISBN | : 9789283600060 |
Author | : Peter R. Voke |
Publisher | : Springer Science & Business Media |
Total Pages | : 438 |
Release | : 2012-12-06 |
Genre | : Technology & Engineering |
ISBN | : 940111000X |
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.
Author | : |
Publisher | : |
Total Pages | : 838 |
Release | : 1995 |
Genre | : Science |
ISBN | : |
Author | : Bernard J. Geurts |
Publisher | : Walter de Gruyter GmbH & Co KG |
Total Pages | : 343 |
Release | : 2022-12-05 |
Genre | : Mathematics |
ISBN | : 3110531828 |
This book presents a comprehensive overview of the mathematics and physics behind the simulation of turbulent flows and discusses in detail (i) the phenomenology of turbulence in fluid dynamics, (ii) the role of direct and large-eddy simulation in predicting these dynamics, (iii) the multiple considerations underpinning subgrid modelling, and, (iv) the issue of validation and reliability resulting from interacting modelling and numerical errors.
Author | : Maria Vittoria Salvetti |
Publisher | : Springer |
Total Pages | : 608 |
Release | : 2019-02-02 |
Genre | : Technology & Engineering |
ISBN | : 3030049159 |
This book gathers the proceedings of the 11th workshop on Direct and Large Eddy Simulation (DLES), which was held in Pisa, Italy in May 2017. The event focused on modern techniques for simulating turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structures, as Direct Numerical Simulation (DNS), Large-Eddy Simulation (LES) or hybrid models based on a combination of LES and RANS approaches. In light of the growing capacities of modern computers, these approaches have been gaining more and more interest over the years and will undoubtedly be developed and applied further. The workshop offered a unique opportunity to establish a state-of-the-art of DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows and to discuss about recent advances and applications. This volume contains most of the contributed papers, which were submitted and further reviewed for publication. They cover advances in computational techniques, SGS modeling, boundary conditions, post-processing and data analysis, and applications in several fields, namely multiphase and reactive flows, convection and heat transfer, compressible flows, aerodynamics of airfoils and wings, bluff-body and separated flows, internal flows and wall turbulence and other complex flows.
Author | : NA Schumann |
Publisher | : Springer Science & Business Media |
Total Pages | : 350 |
Release | : 2013-04-17 |
Genre | : Technology & Engineering |
ISBN | : 3663001970 |
This volume contains papers presented to a EUROMECH-Colloquium held in Munich, September 30 to October 2, 1985. The Colloquium is number 199 in a series of colloquia inaugurated by the European Mechanics Committee. The meeting was jointly organized by the 'Lehrstuhl fur Stromungsmechanik' at the 'Technische Universitat Munchen' and the 'Institut fur Physik der Atmosphare' of the 'Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt' (DFVLR) in Oberpfaffenhofen. 'Direct' and 'large eddy simulation' are terms which denote two closely con nected methods of turbulence research. In a 'direct simulation' (DS), turbu lent motion is simulated by numerically integrating the Navier-Stokes equations in three-dimensional space and as a function of time. Besides ini tial and boundary conditions no physical simplifications are involved. Com puter resources limit the resolution in time and space, though simulations with an order of one million discrete points in space are feasible. The simu lated flow fields can be considered as true realizations of turbulent flow fields and analysed to answer questions on the basic behaviour of turbulence. Direct simulations are valid as long as all the excited scales remain within the band of resolved scales. This means that viscosity must be strong enough to damp out the not resolved scales or the simulation is restricted to a lim ited integration-time interval only. In summary, DS provides a tool to investigate turbulent motions from first principles at least for a finite band of scales.
Author | : Dimokratis G.E. Grigoriadis |
Publisher | : Springer |
Total Pages | : 523 |
Release | : 2017-10-06 |
Genre | : Technology & Engineering |
ISBN | : 3319632124 |
This book addresses nearly all aspects of the state of the art in LES & DNS of turbulent flows, ranging from flows in biological systems and the environment to external aerodynamics, domestic and centralized energy production, combustion, propulsion as well as applications of industrial interest. Following the advances in increased computational power and efficiency, several contributions are devoted to LES & DNS of challenging applications, mainly in the area of turbomachinery, including flame modeling, combustion processes and aeroacoustics. The book includes work presented at the tenth Workshop on 'Direct and Large-Eddy Simulation' (DLES-10), which was hosted in Cyprus by the University of Cyprus, from May 27 to 29, 2015. The goal of the workshop was to establish a state of the art in DNS, LES and related techniques for the computation and modeling of turbulent and transitional flows. The book is of interest to scientists and engineers, both in the early stages of their career and at a more senior level.