Progress in Turbulence IX: Proceedings of the iTi Conference in Turbulence 2021 (Springer Proceedings in Physics, 267)

This volume collects the edited and reviewed contribution presented in the 9th iTi Conference that took place virtually, covering fundamental and applied aspects in turbulence. In the spirit of the iTi conference, the volume is produced after the conference so that the authors had the opportunity to incorporate comments and discussions raised during the meeting. In the present book, the contributions have been structured according to the topics: I Experiments; II Simulations and Modelling; III Data Processing and Scaling; IV Theory; V Miscellaneous topics Preface Contents Contributors Part I Experiments Dynamic Triad Interactions and Non-equilibrium Turbulence 1 Why the Need for New Perspectives on the Established Theory? 1.1 Why Experiments Cannot Prove a Theory 2 The Assumption of Universal Equilibrium 2.1 Local Equilibrium and the Locality of Scale Interactions 2.2 The Crucial Constancy of Spectral Energy Flux 3 Nonlinear Triadic Energy Transfer 3.1 The Navier-Stokes Machine and New Theory Developments 4 Establishing a New Laboratory and Developing a Theoretical Framework References Turbulent/Turbulent Entrainment 1 Introduction 2 Turbulent/Turbulent Interface 3 Turbulent/Turbulent Entrainment References Active Control of Turbulent Convective Heat Transfer with Plasma Actuators 1 Introduction 2 Experimental Setup and Methodology 3 Plasma Actuation Effects on Flow Fields and Heat Transfer 4 Conclusions References Mean Parameters of Incompressible Turbulent Boundary Layer with Zero Pressure Gradient on the Wall of the TsAGI T-128 Wind Tunnel at Very High Reynolds Numbers 1 Introduction 2 Experimental Set-Up 3 Results 4 Conclusions References Investigation of Self-Similarity of the Temperature Stratified Turbulent Boundary Layer Over the Wavy Surface in Laboratory Conditions 1 Introduction 2 The Description of the Experimental Setup 3 The Self-Similar Behavior of the Velocity and Temperature Defect Profiles 4 Conclusion References On Similarity of Turbulence Statistics of a Turbulent Planar Jet Taking the Static Pressure into Account 1 Introduction 2 Experimental Setup 3 Results 4 Summary References Mean Velocity Profiles over Streamwise-Aligned Permeable Ridges 1 Introduction 2 Experimental Setup 3 Results 4 Concluding Remarks References Energy Dissipation and Total Entropy Production in SHREK Experiment 1 Introduction 2 Experimental Data Sets 3 Results and Discussion 4 Conclusion References Part II Simulations and Modelling The Filtering Approach as a Tool for Modeling and Analyzing Turbulence 1 Introduction 2 Statistical and Generalized Central Moments 2.1 Multiscale Identities 3 Recent Contributions 3.1 Structure of the Subfilter Stress 3.2 Decomposition of the Reynolds Stress 3.3 Dynamic Coarse Grained Modeling 3.4 Statistical Homogeneity Indices 4 Conclusions References Dynamic Bridging for Coarse Grained Simulations of Turbulent Material Mixing 1 Background 2 Simulations of the CEA Planar Shock Tube Experiments References Dynamic Tensorial Eddy Viscosity and Turbulent Stresses 1 Theoretical Framework 2 The Flow Equations and the Subgrid Model 2.1 Results References A Numerical Study of the Spanwise Turbulence Past a Cylinder Flow 1 Introduction 2 Indices of Statistical Resolution 3 Numerical Results References Asymmetry in Wake of Oscillating Foils with Combined Pitching and Heaving Motion 1 Introduction 2 Problem Description 3 Results and Discussion 4 Conclusions References Helical Structures in the Wake of Long Wall-Mounted Prisms at High Incident Angles 1 Introduction 2 Problem Description 3 Results 4 Conclusion References A Spatially Accelerating Turbulent Flow with Longitudinally Moving Walls 1 Introduction 2 Methodology 3 Results and Discussion 4 Conclusion References Dissimilarity Between Heat and Momentum Transfer of Turbulent Heat Transfer over Surfaces with Hemisphere Protrusions 1 Introduction 2 Flow Conditions 3 Results and Discussion 4 Conclusion References Part III Data Processing and Scaling The Diagnostic Plot—A Tutorial with a Ten Year Perspective 1 Introduction 2 The Background and Original Diagnostic Plot 3 Extension to the Near Wall Region 4 How the Diagnostic Idea Can Be Used to Predict High Re Flows 5 Use in Complex Flow Situations—Rough Wall Example 6 An Example: How the Diagnostic Plot Can Be Used in Practice 7 Summary and Conclusions References Bayesian Optimisation with Gaussian Process Regression Applied to Fluid Problems 1 Introduction 2 Bayesian Optimisation 3 Shape Optimisation in a Lid-Driven Cavity Flow 4 Conclusion and Outlook References Data-Driven Dynamics Description of a Transitional Boundary Layer 1 Introduction 2 Methodology 3 Kinematic Analysis 4 Dynamical Analysis 5 Conclusions References Identification of a Stochastic Hopf Bifurcation from Stationary Measurement Data of a Turbulent Flow 1 Introduction 2 Stochastic Modelling Approach 3 Application to Experimental Data 4 Discussion References Data-Driven Identification of Robust Low-Order Models for Dominant Dynamics in Turbulent Flows 1 Introduction 2 Two-Stage Sparsification 2.1 Conservative Sparsification 2.2 Restrictive Sparsification 3 Application to Experimental Data 4 Conclusion References Experimental Assessment of Symmetry Induced Higher-Moment Scaling Laws in Turbulent Pipe Flow 1 Background 2 Results 3 Conclusions References Characteristics of Reynolds Shear Stress in Adverse Pressure Gradient Turbulent Boundary Layers 1 Introduction 1.1 Mean Momentum Balance 1.2 Experimental and Computational Data Summary 2 Results 2.1 ZPG TBL for Increasing Reynolds Number 2.2 ZPG TBL and APG TBL at Matched Reynolds Number 2.3 ZPG TBL and APG TBL: Effects of β and Reτ 3 Conclusion References Energy Transfer in Turbulent Boundary Layers with Adverse Pressure Gradient 1 Introduction 2 The Flow Case 3 Results 3.1 The Reynolds Stress Budgets 3.2 The Spectral Distributions 4 Conclusion References Influence of Rough Surface Morphology on Boundary Layer Flow 1 Introduction 2 Experimental Setup 3 Mean Flow Profiles 4 Diagnostic Plot 5 Conclusion References Part IV Theory Similarity Scaling of a Free, Round Jet in Air 1 Background 2 Space-Time Symmetries and Conservation Laws 3 Simple Jet Model 4 Measurements 5 Conclusion References Topological Differences in Mean Wakes of Circular and Square Cantilevered Cylinders 1 Introduction 2 Methodology 3 Results and Discussion 4 Concluding Remarks References Large-Scale-Motions and Self-excited Clustering of Coherent Structures in Wall Turbulence 1 Introduction 2 Coherent Alignment of One-Dimensional (1D) Clusters. Structuration of VLSM 3 Self-exciting Processes and Regeneration of Large-Scale-Motions 4 Conclusion References The Conservative Pressure Hessian and the Free Fluid Particle Model 1 Introduction 2 Constructing the Conservative Pressure Hessian 3 Conservative Pressure Hessian from DNS Data 4 The Free Fluid Particle and the Control of Singularities 5 Concluding Remarks and Outlook References Modelling The Pressure Hessian in Turbulence Through Tensor Function Representation Theory 1 Introduction 2 Statistical Dynamics of Velocity Gradients and Tensor Function Representation Theory 3 Pressure Hessian Components as Functions of the Velocity Gradient Invariants 4 Concluding Remarks References Stretched Amplitude Decaying Fourier Modes in the Jet Far-Field 1 Introduction 2 Proper Orthogonal Decomposition 2.1 SADFM 3 Results and Discussion 4 Summary References Generalizable Theory of Reynolds Stress 1 Introduction 2 Dissipation Scaling 3 Turbulence Flux Dynamics 4 Energy Spectra 5 Summary References Spectral Energetics of a Quasilinear Approximation in Uniform Shear Turbulence 1 Introduction 2 Problem Formulation 3 Results and Discussion 4 Concluding Remarks References Part V Miscellaneous Topics Turbulence and Uncertainty for Future Renewable Energy Reliability References Instability on Rotating Sharp Cones—Revisited 1 Introduction 2 Time-Frequency Decomposition Using STFT 3 Conclusion References Rotational Effects on Layered Structures in Inhomogeneous Stratified Turbulence 1 Introduction 2 Numerical Methods 3 Results and Discussions 4 Conclusions References Magnetoclinicity Instability 1 Magnetoclinicity: Dynamo at Strong Compressibility 2 Equilibrium State and Disturbance 3 Normal Mode Analysis of the Mean-Field Equations 4 Instability Across the Strong Density Variation References Beginning of Taylor's and Wavy Vortices at the Loss of Stability of a Conducting Liquid Flow Produced by the Rotating Magnetic Field 1 Introduction 2 Presentation of the Problem 3 Conclusions References Investigation of the Flow Generated by the Surface Discharge on the Cylinder Body in the Quiescent Air 1 Introduction 2 Methods and Instruments 3 Results 4 Conclusions References Numerical and Physical Aspects of Large-Eddy Simulation of Turbulent Mixing in a Helium-Air Supersonic Co-flowing Jet 1 Introduction 2 Test Case and Numerical Setting 3 Simulation Results 4 Conclusions References Turbulent Energy Production in the Boundary Layer of a Gas Flow Near the Free Surface of a Liquid 1 Introduction 2 Experimental Setup and Method 3 Results 4 Conclusion References Phase Distribution of the Developed Three-Component Pipe Flows 1 Introduction 2 Problem Statement and Method 2.1 Three-Phase Flow Regimes and Isokinetic Probe Design 2.2 Simulation Method 3 Results 4 Conclusion References