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Large-Eddy Simulation in Hydraulics [Kietas viršelis]

, (Cardiff University, Cardiff, UK), (The University of Iowa, Iowa City, IA, USA)
  • Formatas: Hardback, 266 pages, aukštis x plotis: 246x170 mm, weight: 650 g, 240 Illustrations, color
  • Serija: IAHR Monographs
  • Išleidimo metai: 27-Jun-2013
  • Leidėjas: CRC Press
  • ISBN-10: 1138000248
  • ISBN-13: 9781138000247
Kitos knygos pagal šią temą:
Large-Eddy Simulation in HydraulicsDidesnis paveikslėlis
  • Formatas: Hardback, 266 pages, aukštis x plotis: 246x170 mm, weight: 650 g, 240 Illustrations, color
  • Serija: IAHR Monographs
  • Išleidimo metai: 27-Jun-2013
  • Leidėjas: CRC Press
  • ISBN-10: 1138000248
  • ISBN-13: 9781138000247
Kitos knygos pagal šią temą:
Pastovi nuoroda: https://www.kriso.lt/db/9781138000247.html

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.

Recenzijos

"Large-Eddy Simulation in Hydraulics is recommended to numerical modellers working on turbulent flow problems in any branch of hydraulics. To quote William Cowper (The Task: A Poem in Six Books, Book III, The Garden, 1785)

A life all turbulence and noise may seem, To him that leads it, wise and to be praised; But wisdom is a pearl with most success Sought in still water, and beneath clear skies.

Overall, the authors are to be congratulated on producing a wise textbook that is timely, very informative and covers a topic of great importance in modern fluid mechanics."

A.G.L. Borthwick, Proceedings of the Institution of Civil Engineers, Engineering and Computational Mechanics 167, March 2014, Issue EM1 "Large-Eddy Simulation in Hydraulics is recommended to numerical modellers working on turbulent flow problems in any branch of hydraulics. To quote William Cowper (The Task: A Poem in Six Books, Book III, The Garden, 1785)

A life all turbulence and noise may seem, To him that leads it, wise and to be praised; But wisdom is a pearl with most success Sought in still water, and beneath clear skies.

Overall, the authors are to be congratulated on producing a wise textbook that is timely, very informative and covers a topic of great importance in modern fluid mechanics."

A.G.L. Borthwick, in: Proceedings of the Institution of Civil Engineers, Engineering and Computational Mechanics 167, March 2014, Issue EM1

Preface xi
1 Introduction
1(12)
1.1 The role and importance of turbulence in hydraulics
1(1)
1.2 Characteristics of turbulence
2(5)
1.3 Calculation approaches for turbulent flows
7(3)
1.4 Scope and outline of the book
10(3)
2 Basic methodology of LES
13(10)
2.1 Navier-Stokes equations and Reynolds Averaging (RANS)
13(2)
2.2 The idea of LES
15(1)
2.3 Spatial filtering/averaging and resulting equations
16(4)
2.4 Implicit filtering and Schumann's approach
20(1)
2.5 Relation of LES to DNS and RANS
21(2)
3 Subgrid-Scale (SGS) models
23(14)
3.1 Role and desired qualities of an SGS-model
23(2)
3.2 Smagorinsky model
25(2)
3.3 Improved versions of eddy viscosity models
27(6)
3.3.1 Dynamic procedure
27(4)
3.3.2 WALE model
31(1)
3.3.3 Transport-equation SGS models
32(1)
3.4 SGS models not based on the eddy viscosity concept
33(2)
3.4.1 Scale-Similarity Model
33(1)
3.4.2 Dynamic Mixed Model
34(1)
3.4.3 Approximate Deconvolution Models (ADM) and Sub-Filter Scale Models (SFS)
34(1)
3.5 SGS models for the scalar transport equation
35(2)
4 Numerical methods
37(24)
4.1 Introduction
37(2)
4.2 Discretization methods
39(8)
4.2.1 Finite Difference Method (FDM)
39(3)
4.2.2 Finite Volume Method (FVM)
42(1)
4.2.3 Time discretization
43(4)
4.3 Numerical accuracy in LES
47(3)
4.4 Numerical errors
50(2)
4.5 Solution methods for incompressible flow equations
52(3)
4.6 LES grids
55(6)
4.6.1 Structured grids
55(1)
4.6.2 Block-structured grids with matching or non-matching interfaces
56(1)
4.6.3 Unstructured grids
57(1)
4.6.4 Structured grids together with the Immersed Boundary Method (IBM)
58(3)
5 Implicit LES (ILES)
61(8)
5.1 Introduction
61(1)
5.2 Rationale for ILES and connection with LES using explicit SGS models
62(1)
5.3 Adaptive Local Deconvolution Model (ALDM)
63(2)
5.4 Monotonically Integrated LES (MILES)
65(4)
6 Boundary and initial conditions
69(28)
6.1 Periodic boundary conditions
70(2)
6.2 Outflow boundary conditions
72(1)
6.3 Inflow boundary conditions
73(6)
6.3.1 Precursor simulations
74(1)
6.3.2 Time-averaged velocity profile superimposed with synthetic turbulence
75(4)
6.4 Free surface boundary conditions
79(4)
6.5 Smooth-wall boundary conditions
83(5)
6.6 Rough-wall boundary conditions
88(6)
6.7 Initial conditions
94(3)
7 Hybrid RANS-LES methods
97(24)
7.1 Introduction
97(4)
7.1.1 Motivation
97(1)
7.1.2 Similarity between LES and URANS equations and difference between the approaches
98(2)
7.1.3 Types of hybrid models covered
100(1)
7.1.4 Numerical requirements
101(1)
7.2 Two-layer models
101(5)
7.2.1 Models with a sharp interface between RANS and LES regions
102(3)
7.2.2 Models with a smooth transition between RANS and LES regions
105(1)
7.3 Embedded LES
106(3)
7.3.1 Inflow to LES sub-domain
106(2)
7.3.2 Outflow from LES sub-domain
108(1)
7.3.3 Lateral coupling of LES and RANS sub-domains
109(1)
7.4 Detached, Eddy Simulation (DES) models
109(8)
7.4.1 Overview of DES model
109(1)
7.4.2 DES based on the Spalart-Allmaras (SA) model
110(2)
7.4.3 DES based on the SST model
112(2)
7.4.4 Improved versions of DES
114(3)
7.5 Scale-Adaptive Simulation (SAS) model
117(2)
7.6 Final comments on hybrid RANS-LES models and future trends
119(2)
8 Eduction of turbulence structures
121(14)
8.1 Structure eduction from point signals: Two-point correlations and velocity spectra
122(3)
8.2 Structure eduction from instantaneous quantities in 2D planes
125(4)
8.3 Structure eduction from isosurfaces of instantaneous quantities in 3D space
129(6)
9 Application examples of LES in hydraulics
135(92)
9.1 Developed straight open channel flow
135(4)
9.2 Flow over rough and permeable beds
139(9)
9.3 Flow over bedforms
148(7)
9.4 Flow through vegetation
155(6)
9.5 Flow in compound channels
161(7)
9.6 Flow in curved open channels
168(7)
9.7 Shallow merging flows
175(10)
9.7.1 Shallow mixing layer developing between two parallel streams
175(5)
9.7.2 River confluences
180(5)
9.8 Flow past in-stream hydraulic structures
185(17)
9.8.1 Flow past bridge piers
185(7)
9.8.2 Flow past bridge abutments and isolated spur dikes
192(4)
9.8.3 Flow past groyne fields
196(6)
9.9 Flow and mass exchange processes around a channel-bottom cavity
202(5)
9.10 Gravity currents
207(9)
9.10.1 Gravity currents propagating over a flat smooth bed
208(3)
9.10.2 Gravity currents propagating over a rough surface containing 2-D dunes or ribs or in a porous medium
211(5)
9.11 Eco-hydraulics: Flow past an array of freshwater mussels
216(4)
9.12 Flow in a water pump intake
220(7)
Appendix A - Introduction to tensor notation 227(2)
References 229(20)
Index 249
Wolfgang Rodi, George Constantinescu, Thorsten Stoesser