Large Eddy Simulations of Supersonic Impinging Jet Flow Fields PDF Download
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Author: N. Sinha
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Category :
Languages : en
Pages :
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Author: N. Sinha
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Category :
Languages : en
Pages :
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Author: D. P. Rizzetta
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Category :
Languages : en
Pages :
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Author: Seyyed Saman Salehian
Publisher:
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Category : Aerodynamics
Languages : en
Pages : 536
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"The noise generated by supersonic jet is of primary interest in the high-speed flight. In several flight conditions jet exhaust of the propulsion system interacts with solid surfaces. For example, jet impingement on ground for a rocket lift-off, or interactions influenced by the integration of the engine with the airframe. Such complex applications require consideration of the role of acoustic-surface interactions on the noise generation of the jet and its radiation. Numerical analysis of supersonic jet noise involved in these scenarios is investigated by employing Hybrid Large Eddy Simulation - Unsteady Reynolds Averaged Simulation approach to model turbulence. First, the supersonic impinging jet noise reduction using aqueous injectors is investigated. The technique employed to suppress impingement noise, involves injecting liquid water from the ground surface. The Volume of Fluid model is adopted to simulate the two phase flow. The flow field and acoustic results agree well with the existing experimental data. The possible mechanisms of noise reduction by water injection are investigated. Second, supersonic jet noise reduction by employing the shielding effect of a flat plate parallel to the jet is investigated. The numerical simulations model the shielding effect of the flat plate on the acoustics of supersonic jet, and results agree with the corresponding experimental data. The physical mechanisms involved in the flow-surface interactions are investigated. With understanding these mechanisms, a slightly wavy plate is proposed including theoretical background to determine the parameters needed for the way wall to provide acoustic reduction efficiently. Results show that the proposed wavy shield can effectively reduce both the level and extent of the jet noise source as compared to that of a flat shield."--Abstract.
Author: Sung-In Kim
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Category :
Languages : en
Pages :
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Author:
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Category : Airplanes
Languages : en
Pages : 596
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Author: C. Fureby
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Category :
Languages : en
Pages :
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Author: A. Krothapalli
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Category :
Languages : en
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Author: E. Lillberg
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Category :
Languages : en
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Category : Electronic books
Languages : en
Pages : 59
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Numerical modeling of a supersonic underexpanded gas jet and subsequent mixture formation is performed in order to study the effects of numerical methodology and mesh resolution for two computational fluid dynamic codes. Accurately modeling supersonic underexpanded gas jets requires advanced computational techniques and highly refined meshes which are both computationally demanding and not suitable for the complex moving geometries encountered in many practical engineering applications. Many commercial codes employ the finite volume method to handle complex moving geometries. However, to date there has been very little published data examining the use of finite volume methods for simulating supersonic jets. The goal of this work is to assess the suitability and minimum resolution requirements for the computation of a supersonic underexpanded gas jet with engineering accuracy using a commercial finite volume method CFD code. Additionally, a 1D code was developed to estimate and predict gas jet nozzle injection and performance parameters. The effects of numerical methodology, modeling, and resolution on the prediction of underexpanded supersonic jet flows are compared using a commercial low-order finite volume solver, ConvergeTM, and a high-order Hybrid Central/WENO-Z based solver developed at SDSU. The impact of grid resolution is clearly evident in the commercial code. Results of a grid convergence study reveal that failing to resolve the grid in the commercial code sufficiently result in drastic differences in the jets behavior, while the Hybrid code displayed only modest differences. Instabilities in the location of the Mach disk were observed in the commercial code but not present in the Hybrid code. The near nozzle shock structure was analyzed and the results of both codes were in good agreement. An analysis of the energy spectrum and Reynolds stresses at a downstream location that is almost fully turbulent displayed expected behavior for both codes. When sufficiently refined, the commercial code does a reasonable job of predicting the underexpanded gas jet within engineering accuracy. However, the commercial code was nearly 17 times more computationally expensive then the Hybrid code, which may limit its application to practical engineering problems.
Author: Michel Deville
Publisher: Springer
ISBN: 9783642422515
Category : Technology & Engineering
Languages : en
Pages : 0
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Keynote Lectures.- Some Characteristics of Non-Reacting and Reacting Low Swirl Number Jets.- Inner-Outer Interactions in Wall-Bounded Turbulence.- Turbulence Interaction with Atmospheric Physical Processes.- LES of Pulsating Turbulent Flows over Smooth and Wavy Boundaries.- Numerical Study of Turbulence-Wave Interaction.- High Reynolds Number Wall-Bounded Turbulence and a Proposal for a New Eddy-Based Model.- Regular Papers.- PANS Methodology Applied to Elliptic-Relaxation Based Eddy Viscosity Transport Model.- PIV Study of Turbulent Flow in Porous Media.- A Model for Dissipation: Cascade SDE with Markov Regime-Switching and Dirichlet Prior.- Wavelet Analysis of the Turbulent LES Data of the Lid-Driven Cavity Flow.- A Two-Phase LES Compressible Model for Plasma-Liquid Jet Interaction.- Simulation of a Fluidized Bed Using a Hybrid Eulerian-Lagrangian Method for Particle Tracking.- Wavelet-Adapted Sub-grid Scale Models for LES.- Effect of Particle-Particle Collisions on the Spatial Distribution of Inertial Particles Suspended in Homogeneous Isotropic Turbulent Flows.- Effect of Near-Wall Componental Modification of Turbulence on Its Statistical Properties.- Large-Eddy Simulation of Transonic Buffet over a Supercritical Airfoil.- Large Eddy Simulation of Coherent Structures over Forest Canopy.- Toroidal/Poloidal Modes Dynamics in Anisotropic Turbulence.- Grid Filter Modeling for Large-Eddy Simulation.- Pulsating Flow through Porous Media.- Thermodynamic Fluctuations Behaviour during a Sheared Turbulence/Shock Interaction.- LES and DES Study of Fluid-Particle Dynamics in a Human Mouth-Throat Geometry.- Viscous Drag Reduction with Surface-Embedded Grooves.- Study on the Resolution Requirements for DNS in Turbulent Rayleigh-Bénard Convection.- On the Role of Coherent Structures in a Lid Driven Cavity Flow.- Local versus Nonlocal Processes in Turbulent Flows, Kinematic Coupling and General Stochastic Processes.- Time-Resolved 3D Simulation of an Aircraft Wing with Deployed High-Lift System.- Fluid Mechanics and Heat Transfer in a Channel with Spherical and Oval Dimples.- Investigation of the Flow around a Cylinder Plate Configuration with Respect to Aerodynamic Noise Generation Mechanisms.- LES of the Flow around Ahmed Body with Active Flow Control.- Enhanced Bubble Migration in Turbulent Channel Flow by an Acceleration-Dependent Drag Coefficient.- Experimental and Numerical Study of Unsteadiness in Boundary Layer / Shock Wave Interaction.- Measurement of Particle Accelerations with the Laser Doppler Technique.- A Novel Numerical Method for Turbulent, Two-Phase Flow.- Modeling of High Reynolds Number Flows with Solid Body Rotation or Magnetic Fields.- Direct Numerical Simulation of Buoyancy Driven Turbulence inside a Cubic Cavity.- Numerical Simulations of a Massively Separated Reactive Flow Using a DDES Approach for Turbulence Modelling.- Particle Dispersion in Large-Eddy Simulations: Influence of Reynolds Number and of Subgrid Velocity Deconvolution.- Use of Lagrangian Statistics for the Direct Analysis of the Turbulent Constitutive Equation.- Numerical Simulation of Supersonic Jet Noise with Overset Grid Techniques.- Large Eddy Simulation of Turbulent Jet Flow in Gas Turbine Combustors.- Computations of the Flow around a Wind Turbine: Grid Sensitivity Study and the Influence of Inlet Conditions.- Stochastic Synchronization of the Wall Turbulence.- Large-Eddy Simulations of an Oblique Shock Impinging on a Turbulent Boundary Layer: Effect of the Spanwise Confinement on the Low-Frequency Oscillations.- Parameter-Free Symmetry-Preserving Regularization Modelling of Turbulent Natural Convection Flows.- An a Priori Study for the Modeling of Subgrid Terms in Multiphase Flows.- Computation of Flow in a 3D Diffuser Using a Two-Velocity Field Hybrid RANS/LES.- On the Dynamics of High Reynolds Number Turbulent Axisymmetric and Plane Separating/Reattaching Flows.- Numerical Simulation and Statistical Modeling of Inertial Droplet Coalescence
