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Direct Numerical Simulations and Modeling of Jets in Crossflow

Direct Numerical Simulations and Modeling of Jets in Crossflow PDF Author: Suman Muppidi
Publisher:
ISBN:
Category :
Languages : en
Pages : 336

Book Description


Direct Numerical Simulations and Modeling of Jets in Crossflow

Direct Numerical Simulations and Modeling of Jets in Crossflow PDF Author: Suman Muppidi
Publisher:
ISBN:
Category :
Languages : en
Pages : 336

Book Description


Direct Numerical Simulation of Axisymmetric Jets

Direct Numerical Simulation of Axisymmetric Jets PDF Author: F. F. Grinstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 16

Book Description
We present results from numerical simulations of the evolution of the Kelvin-Helmholtz instability for an unforced, subsonic, compressible axisymmetric, spatially-evolving shear layer. In addition, we study the effect of small, random pressure fluctuations at the nozzle orifice on the growth of the mixing layers. These fluctuations model inflow perturbations in experimental flows arising from turbulence and boundary layers in the nozzle. The finite-difference numerical model used to perform the simulations solves the two-dimensional time-dependent conservation equations for an ideal fluid using the Flux-Corrected Transport algorithm and timestep-splitting techniques. No subgrid turbulence model has been included. In the absence of perturbations, the calculations indicate that the large scale development of the unforced jet shear layer has an underlying degree of organization. This is the result of a feedback mechanism in which the shear layer ahead of nozzle edge is modulated by the far field induced gy the mergings on downstream, near the end of the potential core of the jet. The studies with random high frequency perturbations on the inflow velocity show that they effectively tend to break the temporal correlations between the structures. Keywords: Coherent structures; Free Shear flows.

Direct and Large Eddy Simulation XII

Direct and Large Eddy Simulation XII PDF Author: Manuel GarcĂ­a-Villalba
Publisher: Springer Nature
ISBN: 3030428222
Category : Technology & Engineering
Languages : en
Pages : 478

Book Description
This book gathers the proceedings of the 12th instalment in the bi-annual Workshop series on Direct and Large Eddy Simulation (DLES), which began in 1994 and focuses on modern techniques used to simulate turbulent flows based on the partial or full resolution of the instantaneous turbulent flow structure. With the rapidly expanding capacities of modern computers, this approach has attracted more and more interest over the years and will undoubtedly be further enhanced and applied in the future. Hybrid modelling techniques based on a combination of LES and RANS approaches also fall into this category and are covered as well. The goal of the Workshop was to share the state of the art in DNS, LES and related techniques for the computation and modelling of turbulent and transitional flows. The respective papers highlight the latest advances in the prediction, understanding and control of turbulent flows in academic and industrial applications.

Numerical Simulations of Multiphase Turbulent Jets

Numerical Simulations of Multiphase Turbulent Jets PDF Author: Thomas Gabriel Almeida
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 192

Book Description


Detailed Numerical Simulation of Liquid Jet in Crossflow Atomization with High Density Ratios

Detailed Numerical Simulation of Liquid Jet in Crossflow Atomization with High Density Ratios PDF Author: Sina Ghods
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 86

Book Description
The atomization of a liquid jet by a high speed cross-flowing gas has many applications such as gas turbines and augmentors. The mechanisms by which the liquid jet initially breaks up, however, are not well understood. Experimental studies suggest the dependence of spray properties on operating conditions and nozzle geometry. Detailed numerical simulations can offer better understanding of the underlying physical mechanisms that lead to the breakup of the injected liquid jet. In this work, detailed numerical simulation results of turbulent liquid jets injected into turbulent gaseous cross flows for different density ratios is presented. A finite volume, balanced force fractional step flow solver to solve the Navier-Stokes equations is employed and coupled to a Refined Level Set Grid method to follow the phase interface. To enable the simulation of atomization of high density ratio fluids, we ensure discrete consistency between the solution of the conservative momentum equation and the level set based continuity equation by employing the Consistent Rescaled Momentum Transport (CRMT) method. The impact of different inflow jet boundary conditions on different jet properties including jet penetration is analyzed and results are compared to those obtained experimentally by Brown & McDonell(2006). In addition, instability analysis is performed to find the most dominant insta- bility mechanism that causes the liquid jet to breakup. Linear instability analysis is achieved using linear theories for Rayleigh-Taylor and Kelvin- Helmholtz instabilities and non-linear analysis is performed using our flow solver with different inflow jet boundary conditions.

Advanced Approaches in Turbulence

Advanced Approaches in Turbulence PDF Author: Paul Durbin
Publisher: Elsevier
ISBN: 0128207744
Category : Technology & Engineering
Languages : en
Pages : 552

Book Description
Front Cover -- Advanced Approaches in Turbulence -- Copyright -- Contents -- Contributors -- Preface -- 1 Basics of turbulence -- 1.1 Introduction -- 1.2 Eddy diffusion -- 1.3 Scales of turbulence -- 1.3.1 Isotropic decay -- 1.3.2 Stretching and diffusion of vorticity -- 1.4 Spectral equations -- 1.4.1 Isotropic turbulence -- 1.4.2 Shear and streaks -- 1.5 Averaged equations -- 1.5.1 Jets -- 1.5.2 Boundary layer -- 1.6 The form of turbulence models -- 1.6.1 Two equation models -- 1.6.2 Reynolds stress transport -- 1.7 Conclusion -- References -- 2 Direct numerical and large-eddy simulation of complex turbulent flows -- 2.1 Introduction -- 2.2 Error as a function of scale -- 2.2.1 Modified wavenumber -- 2.2.2 Nonlinear sources of error -- 2.2.3 Time advancement error as a function of scale -- 2.3 Analysis of numerical errors in large-eddy simulation using statistical closure theory -- 2.3.1 EDQNM closure -- 2.3.2 EDQNM-LES and the inclusion of numerical error -- 2.3.3 EDQNM model -- 2.3.4 Relative magnitudes of error -- 2.4 Simulations in complex geometries -- 2.4.1 Decay of isotropic turbulence -- 2.4.2 Gas turbine combustor -- 2.5 Simulating the flow around moving bodies -- 2.5.1 Fluid phase -- 2.5.2 Solid phase -- 2.5.3 The effects of interpolation -- 2.5.4 Particles in a turbulent channel -- 2.6 What is a 'canonical' flow? -- 2.6.1 Jets in crossflow -- 2.6.2 DNS of turbulent channel flow over random rough surfaces -- 2.7 The analysis of 'big data' -- 2.7.1 DMD of large datasets and numerical error -- 2.7.2 Analysis of wall-pressure fluctuation sources in turbulent channel flow -- 2.8 Bridging the Reynolds number divide -- 2.9 Concluding remarks -- Acknowledgments -- References -- 3 Large-eddy simulations -- 3.1 Introduction -- 3.1.1 Motivation -- 3.2 Governing equations -- 3.2.1 Filtering.

Numerical Simulations of High Speed Turbulent Jets in Crossflow

Numerical Simulations of High Speed Turbulent Jets in Crossflow PDF Author: Xiaochuan Chai
Publisher:
ISBN:
Category :
Languages : en
Pages : 124

Book Description


Direct and Large-Eddy Simulation II

Direct and Large-Eddy Simulation II PDF Author: Jean-Pierre Chollet
Publisher: Springer Science & Business Media
ISBN:
Category : Mathematics
Languages : en
Pages : 448

Book Description
Reports recent developments in the direct numerical simulation and large-eddy simulation of turbulence from Europe and Japan. The 40 papers cover jets, sub-grid models and homogeneous turbulence, separated flows and transition, thermal and compressible flows, wall flows and channel flows, complex flows, reacting flows, combustion, and flow past a square cylinder as a test case for large-eddy simulation 2. Among the specific topics are amplified frequencies in the proximal region of a circular jet, the self-consistency of the Smagorinsky constant and the value of the Rotta parameter at high Reynolds numbers, the large-eddy simulation of separated boundary layer transition, pressure and dilatation effects in high-speed turbulence, the mechanism of attenuation of turbulence by spanwise wall oscillation, non-unique solutions in turbulent curved pipe flow, extending the dynamic modelling procedure to turbulent reacting flows, and the large-eddy simulation of flow past a square cylinder using embedded meshes. No index. Annotation copyrighted by Book News, Inc., Portland, OR

Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015)

Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015) PDF Author: Antonio Segalini
Publisher: Springer
ISBN: 3319306022
Category : Technology & Engineering
Languages : en
Pages : 603

Book Description
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.

Numerical Simulation of a Jet in a Cross-flow

Numerical Simulation of a Jet in a Cross-flow PDF Author: Murray J. Rudman
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages :

Book Description
The jet in cross-flow (JICF) problem has many practical applications and has been studied extensively over the past fifty years. In this paper, a numerical solution for the time- dependent development of a weakly compressible axisymmetric jet issuing into a cross-flow is discussed. Most of the basic vortex systems that are observed experimentally are also observed in the results of the simulation. In particular, the formation of wake vortices in a numerical simulation is observed for the first time and gives hope that the mechanisms responsible for wake vortex formation can be determined using the numerical procedure.