LES, DNS and Rans for the analysis of high-speed turbulent reacting flows



Publisher: National Aeronautics and Space Administration, Publisher: National Technical Information Service, distributor in [Washington, DC, Springfield, Va

Written in English
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Subjects:

  • Turbulence.

Edition Notes

Statementby Peyman Givi.
Series[NASA contractor report] -- NASA-CR 195196., NASA contractor report -- NASA CR-195196.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL14704818M

A simulation of aerodynamic package of a Porsche Cayman. Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid ers are used to perform the calculations required to simulate the free-stream flow of the fluid, and the interaction of the fluid (liquids and gases) with. Advances in Turbulence XI by J. M. L. M Palma, , available at Book Depository with free delivery worldwide. The modeling of turbulent flows is immensely important for a large variety of fluid flows of scientific and engineering interest. The technique of large eddy simulation (LES) is a promising avenue to offer highly detailed simulations of turbulence in a time-accurate manner without excessive averaging inherent in less detailed approaches. number, M∞, of , a free stream velocity, U∞, of m/s, a free stream temperature, T∞, of K and the density in the free stream, ρ∞, is kg/ic boundary conditions are implemented in the spanwise direction. The inflow boundary condition is provided by the rescaling technique outlined by Xu & Martin.1 This method has the advantage of being relatively simple to Cited by:

On the other hand, pure Large Eddy Simulation (LES) methods, which are capable of simulating resolved flow, are computationally way too expensive for wall-bounded turbulent flows. The development of solutions to these problems via the design of hybrid methods involving both RANS and LES elements takes place now over decades. Ideally suited for duct and pipe flows. Turbulence intensity and turbulent viscosity ratio. For external flows: 10 / 1. "Velocity-scalar filtered mass density function for large eddy simulation of turbulent reacting flows." Physics of Fluids 19 (9): - Ren, Z., S.B. Pope. Large-Eddy Simulation of Scramjets. The advent of LES in solving multiphysics turbulent flows has recently enabled the investigation of complex supersonic combustion phenomena in scramjets that were not accessible before with Reynolds-averaged Navier–Stokes Cited by:

complex turbulent flows, Coakley et al. [86] have recommended corrections to apply to the two-equation and turbulent eddy viscosity mode ls. In addition, Aupoix and Viala [87] have proposed corrections to the model for compressible flows. The authors have used flat plate flows and mixing layers to assess the compressible corrections introduced. A coupled LES-ODT model for spatially-developing turbulent reacting shear layers International Journal of Heat and Mass Transfer, , – By: A. Hoffie & T. Echekki. The First Symposium on Turbulence and Shear Flow Phenomena was held September , in Santa Barbara, California. This new symposium series is the successor to the highly regarded series of Symposia on Turbulent Shear Flows, which concluded with the 11th biennial conference in The Symposium aims to be the premier forum for presentation of fundamental and applied research in . In addition, LES submodels should also be used for scalar mixing, combustion, and fuel sprays since all of these can be significantly impacted by the turbulent flows. Large-eddy simulation modelling for turbulence and these other engine processes are discussed in the sections by:

LES, DNS and Rans for the analysis of high-speed turbulent reacting flows Download PDF EPUB FB2

Get this from a library. LES, DNS and Rans for the analysis of high-speed turbulent reacting flows. [P Givi; United States. National Aeronautics and Space Administration.]. LES, DNS and RANS for the analysis of high-speed turbulent reacting flows: annual report submitted to NASA Langley Research Center: progress report for the period August 1, J Advanced Modeling of High Speed Turbulent Reacting Flows Z.

1Li, A. Banaeizadeh1, S. Rezaeiravesh2 3and F.A. Jaberi Michigan State University, East Lansing, MI, This paper provides a brief overview of the compressible scalar filtered mass density function (FMDF) model and its application to high speed turbulent combustion.

The FMDFCited by: 8. An introduction to turbulent reacting flows. This work evaluates the capabilities of the RANS and LES techniques for the simulation of high speed reacting flows. These methods are used to gain.

Publisher Summary. This chapter presents the results from both direct and large-eddy simulations (LES). The overwhelming majority of numerical solutions of turbulent flow fields utilize either a direct numerical simulation (DNS), a filtered approach such as an LES, or an averaged approach such as the Reynolds-averaged Navier–Stokes (RANS) formulation.

An entirely new approach to the large-eddy simulation (LES) of high-speed compressible turbulent flows is presented. Subgrid scale stress models are proposed that are dimensionless functions of the computational mesh size times a Reynolds stress model.

This allows a DNS to go continuously to an LES and then a Reynolds-averaged Navier–Stokes (RANS) computation as the mesh becomes Cited by: Mathematics of Large Eddy Simulation of Turbulent Flows Berselli, Iliescu, and Layton (Springer, ), pp. This book is a nice text on LES focused on the mathematics of LES.

It is written in the style of a math text book (complete with theorems, Lemmas, proofs and remark statements throughout the text).File Size: KB. DNS Analysis of turbulent mixing in two-phase flows Article in International Journal of Multiphase Flow - January with 78 Reads How we measure 'reads'.

HEFAT 9th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics 16 – 18 July Malta MODELING HIGH-SPEED REACTING FLOWS WITH VARIABLE TURBULENT PRANDTL AND SCHMIDT NUMBERS Molchanov A.M.*, Bykov L.V.

and Nikitin P.V. Strong cross winds may affect the running stability of high speed trains via the amplified aerodynamic forces and moments. In this study, simulations of turbulent cross wind flows over the leading and end car of ICE-2 high speed train have been performed at different yaw angles The train aerodynamic problems are closely associated with the flows.

In the first approach, the continuous phase is solved using either RANS or DNS/LES, and the individual particles are tracked. In the second approach, the dispersed phase is averaged, leading to two sets equations, which are quite similar to the RANS equations of single-phase flows.

PDF METHODS FOR COMBUSTION IN HIGH-SPEED TURBULENT FLOWS Second Annual Technical Report Grant NAG from NASA Langley Research Center Dr. Drummond to Cornell University Ithaca, New York Period: Aug - Aug Principal Investigator: Professor Stephen B. Pope September 6, '(NASA-CR) PDF METHODS FOR Cited by: 2.

Modeling compressibility effects in high-speed turbulent flows NAG Final Report s. sarkar Mechanical and Aerospace Engineering U.C.

San Diego 1 Introduction Man has strived to make objects fly faster, first from subsonic to supersonic and then to hypersonic speeds. Spacecraft and high-speed missiles routinely fly at hypersonic MachFile Size: KB.

This is an interesting topic - I think we had some discussions about this in the past. May I suggest you take a look at the paper by Speziale, C.G.: Turbulence modelling for time-dependent RANS and VLES: A review, AIAA Journal (2), LES, DNS and Rans for the analysis of high-speed turbulent reacting flows [microform] [] Givi, Peyman.

[Washington, DC: National Aeronautics and Space Administration ; Springfield, Va.: National Technical Information Service, distributor, ]. Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid ers are used to perform the calculations required to simulate the free-stream flow of the fluid, and the interaction of the fluid (liquids and gases) with surfaces defined by boundary conditions.

Numerical Investigation on Multiphase Reacting/Combusting Turbulent Flows: Aerodynamics, Kinetics, Heat and Mass Transfer Inside a Cement Kiln Precalciner Numerical Study of Heat Transfer in a Row of Cylinders by 2D Large Eddy Simulation.

Andreas Stengaard Thorstensen, Andreas Hybrid RANS-LES Simulation of Turbulent Heat Transfer in a. It can be shown that for simulating homogeneous non-reacting turbulence the number of grid points varies with Reynolds number as \(Re_{t}^{9/4} \), where \(Re_{t} \) is the large-scale turbulent Reynolds number, which is why DNS is limited by computer capacity and the application of DNS remains limited to research problems in simple Author: Nilanjan Chakraborty, Jiawei Lai.

Space-time correlation is a staple method for investigating the dynamic coupling of spatial and temporal scales of motion in turbulent flows.

In this article, we review the space-time correlation models in both the Eulerian and Lagrangian frames of reference, which include the random sweeping and local straining models for isotropic and homogeneous turbulence, Taylor's frozen-flow model and Cited by: Wakes formation of high speed train are generated by free shear layer that is originated from the flow separation due to the sudden change in geometry.

RANS and LES turbulent models are used in this paper to stimulate the formation of wakes and behavior of Author: Sufiah Mohd Salleh, Mohamed Sukri Mat Ali, Sheikh Ahmad Zaki Shaikh Salim, Sallehuddin Muhamad, Muha. Large eddy simulation (LES) is computationally extremely expensive for the investigation of wall-bounded turbulent flows at high Reynolds numbers.

A way to reduce the computational cost of LES by orders of magnitude is to combine LES equations with Reynolds-averaged Navier–Stokes (RANS) equations used in the near-wall region.

@article{osti_, title = {Analysis of Unsteady Turbulent Merging Jet Flows With Temperature Difference}, author = {Geun Jong Yoo and Won Dae Jeon}, abstractNote = {Suitable turbulence model is required in the course of establishing a proper analysis methodology for thermal stripping phenomena.

For this purpose, three different turbulence models of k-e model, modified k-e model, and full. Preliminary DNS Database of Hypersonic Turbulent Boundary Layers M.

Pino Martin Department of Mechanical and Aerospace Engineering Princeton University, Princeton, NJ 33rd AIAA Fluid Dynamics Conference and Exhibit June 22–26, /Orlando, FL For permission to copy or republish, contact the American Institute of Aeronautics and AstronauticsFile Size: 2MB.

DNS of compressible turbulent boundary layers and assessment of data/scaling-law quality - Volume - Christoph Wenzel, Björn Selent, Markus Kloker, Ulrich RistCited by: 9. A broad range of topics in DNS and LES are presented, including new developments in LES modeling, numerical algorithms for LES and DNS, DNS and LES of reacting flows, and DNS and LES for supersonic and hypersonic boundary layers.

The book provides a extensive view of the state of the art in. LES, DNS, and Hybrid RANS-LES I • Monday, 22 June • hrs. Computational fluid dynamics explained.

Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid ers are used to perform the calculations required to simulate the free-stream flow of the fluid, and the interaction of the fluid (liquids and gases) with surfaces defined by.

Computational fluid dynamics This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. (September ) (Lear. Skip to main content. The simulation of turbulent reacting flows, connected with environmental protection and the design of chemical and mechanical processes, is increasingly important.

Statistical Mechanics of Turbulent Flows presents a modern overview of basic ways to calculate such flows. The computing facility existing at AEDC at the time of the committee 's discussions () was based on a 1-MW (million words) CRAY 1S, a 2-MW CRAY XMP .Topics: Large eddy simulation, Pipes, Swirling flow, Flow (Dynamics), Kinetic energy, Turbulence, Vortices, Fluids, Generators, Reynolds number Research on the Solid-Liquid Two-Phase Flow in a Helical Groove Seal.Sidharth, GS, Dwivedi, A, Candler, GV & Nichols, JWGlobal linear stability analysis of high speed flows on compression ramps.

in 47th AIAA Fluid Dynamics Conference, 47th AIAA Fluid Dynamics Conference,American Institute of Aeronautics and Astronautics Inc, AIAA, 47th AIAA Fluid Dynamics Conference,Denver, United Cited by: 3.