## Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015)This volume collects various contributions from the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015) that took place in Stockholm during June 2015. Researchers from all around the world presented their latest results concerning fundamental and applied aspects of fluid dynamics. With its general character, the conference embraced many aspects of fluid dynamics, such as shear flows, multiphase flows and vortex flows, for instance. The structure of the present book reflects the variety of topics treated within the conference i.e. Jets, Wakes, Separated flows, Vehicle aerodynamics, Wall-bounded and confined flows, Noise, Turbomachinery flows, Multiphase and reacting flows, Vortex dynamics, Energy-related flows and a section dedicated to Numerical analyses. |

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### Contents

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Numerical Investigation of a Confined Jet Array Penetrating into a Counterflow | 36 |

6 Coherent Structures in a Turbulent Swirling Jet Under Vortex Breakdown 3D PIV Measurements | 43 |

7 An Effect of Initial Disturbance on Spatial Development of a TwoDimensional Jet at a Low Reynolds Number | 51 |

Effect of Buoyancy on the Instability of Light Jets and Plumes | 61 |

40 Wall Similarity in Turbulent Boundary Layers Subjected to Weak Pressure Gradients | 317 |

Interaction Layer Between a Turbulent Boundary Layer and FreeStream Turbulence | 325 |

Generalization of the Diagnostic Plot to HigherOrder Moments in Turbulent Boundary Layers | 333 |

Experimental and Analytical Investigation of Forest Clearings | 339 |

44 Flow and Heat Transfer of Petal Shaped Double TubeEffects of Pipe Geometry | 347 |

Loss Reduction of the Flow in the Reducing Elbow Duct by Using Weir Shaped Small Obstacle | 355 |

Flow Field Characteristics and Energy Injection in a Tank Stirred by Regular and Fractal Blade Impellers | 363 |

Noise | 370 |

Direct Numerical Simulation of DynamicRotational Controlled Jet | 68 |

Enhancement of Turbulent Diffusion in an Axisymmetric Jet by Vortex Generators | 77 |

11 Diffusion Control of Jet by Acoustically Driven Secondary Film Flow | 85 |

Numerical Simulation of Flow Structure and Heat Transfer in a Swirling GasDroplet Turbulent Flow Through a Pipe Expansion | 92 |

13 The Influence of an Asymmetric Slot on the Flow Characteristics of Synthetic Jets | 101 |

14 Performance Characteristics of a Fan Using Synthetic Jets | 109 |

Wakes | 116 |

Towards Local Isotropy of Higher Order Statistics in Wakes | 119 |

Heat Transfer Enhancement by GridGenerated Turbulence for a Cylinder in Crossflow | 125 |

An Experimental Study on the Relation Between the Wake Inlet Conditions and the Near Wake Topology | 133 |

18 Vortex Structure Extraction from Circular Disk Wake by POD and PIV Processing | 139 |

Subharmonic Lockin and Phase Synchronizaton | 146 |

20 Organization of an Axisymmetric Turbulent Wake in Presence of a Central Protrusion | 157 |

Global Linear Stability Analysis of the Flow Around a Superhydrophobic Circular Cylinder | 164 |

22 Optimal Cancelation of Vortex Street in Flow Past a Circular Cylinder with Controllable Wettability Properties | 171 |

23 Numerical Experiment of Flow Characteristics of a Circular Cylinder with Splitter Plate | 181 |

Wake Structures of a Particle in Straight and Curved Flows | 189 |

Numerical Flow Simulations of a Flexible Plate Attached to an Obstacle in Crossflow | 195 |

Effect of Chordwise Flexibility on Flapping Wing Aerodynamics | 202 |

Separated Flows | 211 |

Characteristics of Recirculation Regions on Ribs of Varying Length | 213 |

Passive Load Control in BackwardFacing Step Flow by Using Chevrons | 222 |

29 Active Flow Control Behind a Backward Facing Step Using a ZeroNetMassFlux System | 231 |

Control of the Reattachment Length of a Transonic 2D BackwardFacing Step Flow | 241 |

31 POD Analysis of Jet and Vortex Flows Induced by Oscillating Backward Facing Step | 249 |

Characterization of the Massively Separated Wake Behind a Square Cylinder by Means of Direct Numerical Simulation | 258 |

33 Investigations on the Effects of Trip Wires on the Performances of a Rectangular Wing | 267 |

Vehicle Aerodynamics | 274 |

Comparison of Synthetic and Pulsed Jets Effect for the Flow Around the Ahmed Body | 275 |

Large Eddy Simulations of Flow Around Two Generic Vehicles in a Platoon | 283 |

Numerical Study of Aerodynamic Interactions in a Homogeneous Multivehicle Formation | 289 |

Numerical Investigation of the Actuated Flow on a Bluff Body | 295 |

WallBounded and Confined Flows | 303 |

Breakdown of a LowSpeed Streak Caused by Turbulent Fluctuations | 305 |

Advection of a Coherent Structure in a Turbulent Boundary Layer | 311 |

47 Numerical Study on the Sound Amplification of a TJunction with Bias Flow | 373 |

Experiments on Sound Radiation in Flow Past Two SidebySide Square Cylinders | 382 |

Turbulent Jet Noise Simulation and Propagation Using a 3rd Order MUSCLCD Scheme on Unstructured Grid and FfowcsWilliams Hawkings | 389 |

Investigation of the Effect of a Realistic Nozzle Geometry on the Jet Development | 399 |

Linear Stability Analyses and Large Eddy Simulations for Acoustic Wave Generation Mechanism of a Transitional Supersonic Jet | 406 |

Can Jet Noise Be Predicted Using Linear Instability Wavepackets? | 413 |

Turbomachinery Flows | 419 |

53 A Numerical Model of Fluid Structure Interaction of a Fluttering Valve | 421 |

54 Capacity Testing and Local Flow Analysis of Geometrically Complex Trims Installed Within a Commercial Control Valve | 430 |

55 Wall Treatment Effects on the Heat Transfer in a Radial Turbine Turbocharger | 439 |

On the Characteristics of the Jet in Film Cooling Applications | 449 |

Similarities and Differences Concerning Flow Characteristics in Centrifugal Compressors of Different Size | 456 |

Multiphase and Reacting Flows | 465 |

58 Study of Liquid Breakup Mechanism Through a HighSpeed Gas Flow | 467 |

Clustering and Settling of Inertial Particles in Turbulence | 475 |

60 On Mechanics of Turbulent GasLiquid Flows | 483 |

61 Film Behavior of TwoPhase Flow in a Horizontal Pipe with a Sudden Contraction | 492 |

62 Some Aspects of Design and Modelling of Multiphase Separation Process in Complex Channels Under Magnetic Fields | 501 |

Tire Water Splash Modeling | 509 |

Algorithm for Automatic Quantification of Flashback and Flash Forward Events from HighSpeed Chemiluminescence Recordings | 519 |

65 Effect of Grouping of Fuel Droplets on a Flame Formed by an Oscillating Spray Jet | 527 |

66 Influence of Coaxial Dielectric Barrier Discharge Plasma Actuator on Jet Flame | 537 |

Vortex Dynamics | 545 |

67 Vortex Rings Formed Behind a FreeFlight Butterfly and Their Dynamic Behaviors | 546 |

68 Experimental and Computational Observation of Air Bubble Ring Due to Plughole Vortex | 555 |

69 Penetration by a Negatively Buoyant Vortex Ring | 564 |

EnergyRelated Flows | 571 |

70 Development of Near Wake of a HAWT Depending on Hub Height | 573 |

A Study of Vertical Axis Wind Turbines | 581 |

72 Performance Comparison of a Vertical Axis Wind Turbine Using Commercial and Open Source Computational Fluid Dynamics Based Codes | 588 |

Measurement and Control of Forces Acting on a Solar Panel | 595 |

Numerical Analyses | 601 |

Two and ThreeDimensional Numerical Analysis for Flow Field Characteristics at Various Low Reynolds Numbers | 603 |

Increasing the Critical Reynolds Number by Maximizing Energy Dissipation Problem | 612 |

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Proceedings of the 5th International Conference on Jets, Wakes and Separated ... Antonio Segalini No preview available - 2016 |