Direct and Large-Eddy Simulation VIII (ERCOFTAC Series, 15)

✍ Scribed by Hans Kuerten; Bernard Geurts; Vincenzo Armenio; Jochen Fröhlich

• Tongue: English
• Leaves: 460
• Category: Library

✦ Synopsis

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.

✦ Table of Contents

Direct and Large-Eddy Simulation VIII
Preface
Contents
Part I Fundamentals
Direct simulations of wall-bounded turbulence
1 Introduction
2 The turbulent boundary layer
3 The breakdown of viscous flow over riblets
4 Conclusions
References
Structure of a turbulent boundary layer studied by DNS
1 Introduction and numerical method
2 Results
2.1 Turbulent statistics and streamwise development
2.2 Vortical coherent structures
3 Summary and conclusions
References
A physical length-scale for LES of turbulent flow
1 Introduction
2 Governing equations and numerical model
3 Results for channel flow
4 Conclusions
References
Regularization modeling of buoyancy-driven flows
1 Introduction
2 C4-regularization modeling
2.1 Stopping the vortex-stretching mechanism
3 Results for a turbulent differentially heated cavity
3.1 Grid (in)dependence analysis
3.2 Performance at higher (and lower) Ra-numbers
4 Concluding remarks
References
On the relevance of discrete test-filtering in the integral-based dynamic modelling
1 Introduction
2 The framework of the analysis
3 Computational assessment. Results
4 Conclusions
References
Hybrid assessment method for LES models
1 Introduction
2 Framework
3 Future work
References
Time-reversibility of Navier-Stokes turbulence and its implication for subgrid-scale models
1 Introduction
2 Numerical results
3 Conclusion
References
Shearless turbulence - wall interaction: a DNS database for second-order closure modeling
1 Introduction
2 Parametric study
3 DNS database
4 Scaling of the Reynolds-stress budgets
5 Conclusion
References
Anisotropic dynamics in filtered wall-turbulent flows
1 Introduction: anisotropic effects on the energy cascade
2 Filtered wall-turbulent dynamics
3 Correct resolution of the wall-turbulent physics
4 Conclusions
References
Large Eddy Simulations of high Reynolds number cavity flows
1 Introduction
2 Numerical method and configurations
3 Influence of the incoming boundary layer
4 Influence of lateral walls
5 Conclusions
References
Part II Methodologies and Modeling Techniques
On the development of a 6th order accurate compact finite difference scheme for incompressible flow
1 Introduction
2 Governing equations and numerical method
2.1 Spatial derivatives
2.2 Application to incompressible Navier-Stokes
3 Results
4 Discussion & conclusion
References
A multilevel method applied to the numerical simulation of two-dimensional incompressible flows past obstacles at high Reynolds number
1 Introduction
2 Description of the problem
2.1 The governing equations and their discretization
2.2 The multilevel methodology
2.3 A second-order immersed boundary method
3 Numerical results
3.1 2D periodic flows
3.2 Flow past a 2D cylinder at Reynolds number 9 500
4 Conclusion
References
Large eddy simulation with adaptive r-refinement for the flow over periodic hills
1 Introduction
2 Moving Mesh Approach
3 Choice of monitor function
4 Results for the flow over periodic hills
References
An eddy-viscosity model based on the invariants of the rate-of-strain tensor
1 Large-eddy simulation
2 When does eddy diffusivity counteract the production of subfilter scales sufficiently?
3 Modeling consistency
4 Vortex stretching
5 Towards a simple qr-model
6 First results
References
LES modeling of the turbulent flow over an Ahmed car
1 Introduction
2 Numerical Method
3 Numerical results
4 Conclusions
References
Spatially Variable Thresholding for Stochastic Coherent Adaptive LES
1 Introduction
2 Stochastic Coherent Adaptive Large Eddy Simulation
2.1 Wavelet Thresholding Filter
2.2 Wavelet-Filtered Navier-Stokes Equations
3 Spatially Variable Thresholding
4 Results
References
Stochastic coherent adaptive LES with time-dependent thresholding
1 Introduction
2 Time-dependent thresholding
3 Results
References
Mixed subgrid scale models for classical and variational multiscale large-eddy simulations on unstructured grids
1 Introduction
2 Methodology
3 Application and discussion
References
Subgrid-Scale Model and Resolution Influences in Large Eddy Simulations of Channel Flow
1 Introduction
2 Numerical method and simulations
3 Results and discussions
4 Conclusions
References
Immersed Boundaries in Large-Eddy Simulation of a transonic cavity flow
1 Introduction
2 Description of numerical method
3 Large Eddy Simulation of a Cavity Flow
4 Conclusions
References
Numerical study of turbulent-laminar patterns in MHD, rotating and stratified shear flows
1 Introduction
2 Direct numerical simulations
3 Results
References
Comparison of SGS Models for Passive Scalar Mixing in Turbulent Channel Flows
1 Introduction and Numerical Methods
2 Data Comparison
3 Results
4 Conclusions
References
Improved wall-layer model for forced-convection environmental LES
1 Introduction
2 Wall model description and numerical set-up
3 Results
4 Conclusions
References
The effect of noise on optimal perturbations for turbulent mixing
1 Introduction
2 Method and case set-up
3 Enstrophy maximization
4 Impact of noise
5 Conclusion
References
Part III Multiphase Flows
Direct and Large Eddy Simulation of Two-Phase Flows with Evaporation
1 Introduction
2 Governing equations
2.1 Gas-phase equations
2.2 Drop equations
2.3 Source terms
3 Large Eddy Simulation equations
3.1 Filtered gas-phase equations
3.2 Drop-equations model for LES utilization
3.3 Source terms in LES
4 Results
4.1 Insights from the DNS results
4.2 LES results
5 Summary and conclusions
References
Influence of Particle-Wall Interaction Modeling on Particle Dynamics in Near-Wall Regions of Turbulent Channel Down-Flow
1 Background and Methodology
2 Results and Discussion
3 Conclusions
References
On the Error Estimate in Sub-Grid Models for Particles in Turbulent Flows
1 Introduction
2 Description of the numerical methods
3 Results
4 Conclusions
References
Benchmark test on particle-laden channel flow with point-particle LES
1 Introduction
2 Base Simulation and Common Parameters
3 Results and Discussion
4 Conclusions and Possible Test Case Extensions
References
On large eddy simulation of particle laden flow: taking advantage of spectral properties of interpolation schemes for modeling SGS effects
1 Introduction
2 Numerical Simulation of the carrier flow
3 Discrete particle simulation
4 Effect of interpolation methods on the spectrum seen by particles
5 Construction of the SOI model
References
DNS of a free turbulent jet laden with small inertial particles
1 Introduction & Methodology
2 Results & Discussions
References
A numerical simulation of the passive heat transfer in a particle-laden turbulent flow
1 Introduction
2 Formulation of the problem
3 Numerical results
4 Conclusion
References
Effect of evaporation and condensation on droplet size distribution in turbulence
1 Introduction and Motivation
2 Mathematical Models in Dimensionless Form
2.1 Dispersed Phase
2.2 Continuum Phase
3 Numerical Schemes and Results
4 Concluding remarks
References
Reduced turbophoresis in two-way coupled particle-laden flows
1 Introduction
2 Mathematical modeling of particle-laden flow
2.1 Fluid phase
2.2 Particulate phase
2.3 Force coupling
3 Results
4 Conclusions
References
Development of a particle laden pipe flow: implications for evaporation
1 Introduction
2 Numerical methodology
3 Results
4 Conclusions
References
Direct numerical simulation of binary-species mixing layers
1 Introduction
2 Methodology and computational setup
3 Diffusivity effects on flow development and characteristics
4 Differential diffusion in mixing layers
5 Concluding remarks
References
Direct Numerical Simulation of a Buoyant Droplet Array
1 Introduction
2 Governing Equations
2.1 Fluid motion
2.2 Interface conditions
3 Computational Method
3.1 CLSVOF Method
3.2 Local Multiple Marker Method
3.3 Deflated PCG Method
4 Results
4.1 Effect of Local Marker Method
4.2 Effect of Deflation Method
5 Conclusion
References
Part IV Environmental Flows
LES modeling and experimental measurement of boundary layer flow over multi-scale, fractal canopies
1 Introduction
2 Description of numerical methods
3 Experimental set up and measurements
4 Numerical and experimental results comparison
5 Conclusions
References
Large Eddy Simulation study of a fully developed thermal wind-turbine array boundary layer
1 Introduction
2 Description of numerical method
3 LES results
4 Conclusions
References
Coherent Structures in the Flow over Two-Dimensional Dunes
1 Introduction
2 Problem formulation and computational configuration
3 Results and discussion
4 Conclusions
References
LES of turbulence around a scoured bridge abutment
1 Introduction
2 Problem formulation
3 Results
4 Conclusions
References
Large Eddy Simulation of a neutral and a stratified flow in a plane asymmetric diffuser
1 Introduction
2 The model
3 Neutral case
4 Stratified case
5 Conclusions
References
Reynolds Number Influence on the Particle Transport in a Model Estuary
1 Introduction
2 Configuration and characteristic numbers
3 Governing equations
4 Particle transport and settling
5 Average particle settling velocity
6 Conclusions
References
Dispersal and fallout simulations for urban consequences management
1 Introduction and Motivation
2 Urban Flow and Dispersal Simulation
2.1 Results and Discussion
References
On the Mechanisms of Pollutant Removal from Urban Street Canyons: A Large-Eddy Simulation Approach
1 Introduction
2 Mathematical Model and Computational Domain
3 Results and Discussions
3.1 Inside the Street Canyons
3.2 Roof Level of the Street Canyons
3.3 Over the Street Canyons
4 Conclusions
References
Part V Compressible Flows and Reactive Flows
Numerical simulations of shock-wave/boundary-layer interaction phenomena
1 Introduction
2 Numerical approach
3 Turbulent boundary layer separation
4 Conclusion
References
DNS of a canonical compressible nozzle flow
1 Introduction
2 Methodology and computational details
3 Results
4 Conclusions
References
Direct numerical simulations of turbulent supersonic axisymmetric wakes
1 Introduction
2 Methodology
3 Results
4 Conclusions
References
DNS of a Variable Density Jet in the Supercritical Thermodynamic State
1 Introduction
2 Methodology
3 Results
4 Conclusions
References
DNS Study on Control of Turbulent Heat Transfer in Curved Channel
1 Introduction
2 Description of Numerical Procedure
2.1 Configurations
2.2 Numerical Method
3 Result
3.1 Nusselt Number
3.2 Mean Velocity Vectors
3.3 Power Spectra Density
4 Conclusion
References
A Priori Assessment of the Potential of Flamelet Generated Manifolds to Model Lean Turbulent Premixed Hydrogen Combustion
1 Introduction
2 Description of the numerical method
3 Results
4 Conclusions
References
Numerical Analysis of a Swirl Stabilized Premixed Combustor with the Flamelet Generated Manifold approach
1 Introduction
2 Combustion Modeling
3 Numerical procedure
4 Results
5 Conclusion
References
Direct Numerical Simulation of highly turbulent premixed flames burning methane
1 Introduction
2 Considered configuration
3 Results and discussion
4 Concluding remarks
References
A New Subgrid Breakup Model for LES of Spray Mixing and Combustion
1 Introduction
2 Formulation
3 Results and Discussion
4 Conclusion
References
LES Modeling of a Turbulent Lifted Flame in a Vitiated Co-flow Using an Unsteady Flamelet/Progress Variable Formulation
1 Introduction
2 Mathematical Model
3 Experimental Configuration and Computational Setup
4 Results
5 Conclusions
References
Direct Numerical Simulation of a Turbulent Reacting Wall-Jet
1 Introduction
2 Governing Equations
2.1 Species equations
3 Numerical Method
4 Reacting Wall-Jet Results
4.1 Verification with non-reacting wall-jet
4.2 Reacting wall-jet simulation
4.3 Reactants statistics
4.4 Probability density functions (PDF's)
References
Novel Developments in Subgrid-Scale Modeling for Space Plasma. Weakly compressible Turbulence in the Local Interstellar Medium
1 Introduction
2 Subgrid-scale models
3 LES implications for turbulence in the local interstellar medium
References
Part VI Rayleigh-Bénard Flow
Numerical simulations of rotating Rayleigh-Bénard convection
1 Introduction
2 Numerical Method
3 Results
4 Conclusions
References
Direct Numerical Simulation and Lagrangian Particle Tracking in turbulent Rayleigh Bénard convection
1 Introduction
2 Description of the numerical methods
3 Results
4 Conclusions
References
Turbulent convection in a Rayleigh-Bénard cell with solid horizontal plates of finite conductivity
1 Introduction
2 Computational setup
3 Results
4 Conclusions
References
Non-Oberbeck-Boussinesq effects in three-dimensional Rayleigh-Bénard convection
1 Introduction
2 Numerical methodology
2.1 Non-Oberbeck-Boussinesq effects
2.2 Computational setup
3 Results
4 Conclusions and outlook
References
Analysis of the large-scale circulation and the boundary layers in turbulent Rayleigh-Bénard convection
1 Introduction
2 Governing equations and numerical method
3 Results
4 Conclusions
References
On DNS and LES of natural convection of wall-confined flows: Rayleigh-Bénard convection
1 Introduction
2 Description of numerical method
3 Results
3.1 DNS results
3.2 LES results
4 Conclusions
References
Part VII Industrial Applications
The use of Direct Numerical Simulations for solving industrial flow problems
1 Introduction
2 Industrially relevant DNS
2.1 LES of the flow around airfoils at high angle of attack
2.2 DNS of the turbulent flow in a pipe with orifices
2.3 DNS of the turbulent Czochralski flow
2.4 DNS of turbulent mixed convection in a room
3 Conclusions
References
High-order direct and large eddy simulations of turbulent flows in rotating cavities
1 Introduction
2 Modeling
3 Results
3.1 Transition to turbulence
3.2 Turbulence
4 Concluding remarks
References
DNS of turbulent flow in a rotating rough channel
1 Introduction
2 Description of numerical method
3 Results
4 Concluding remarks
References
LES of heated fuel bundle arranged into triangular array
1 Introduction
2 Case description
3 Flow pulsations and Reynolds stresses
4 Heat transfer
5 Conclusions
References
Effect of wind-turbine surface loading on power resources in LES of large wind farms
1 Introduction
2 Description of numerical method
3 LES results
4 Optimization of turbine spacing
5 Conclusions
References
DNS of a turbulent channel flow with pin fins array: parametric study
1 Introduction
2 Numerical Method
3 Results
4 Conclusions
References
Drag Reduction on External Surfaces Induced by Wall Waves
1 Introduction
2 Numerical method and flow parameter
3 Results
4 Conclusion
References
Impact of Secondary Vortices on Separation Dynamics in 3D Asymmetric Diffusers
1 Introduction
2 Methodology
3 Results
4 Conclusions
References
Fluid–Structure Interaction of a Flexible Structure in a Turbulent Flow using LES
1 Introduction
2 Computational Methodology
3 Benchmark Test Case
4 Results and Discussion
References