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Sunday, May 17, 2020 | History

3 edition of On the computation of sound by large-eddy simulations found in the catalog.

On the computation of sound by large-eddy simulations

On the computation of sound by large-eddy simulations

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  • 13 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Large eddy simulation.,
  • Stress tensors.,
  • Spatial distribution.,
  • Turbulence.,
  • Quadrupoles.,
  • Acoustics.

  • Edition Notes

    StatementUgo Piomelli, Craig L. Streett, and Sutanu Sarkar.
    Series[NASA contractor report] -- NASA/CR-208109., NASA contractor report -- NASA CR-208109.
    ContributionsStreett, Craig L., Sarkar, S., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15507804M

    PROGRESS-VARIABLE APPROACH FOR LARGE-EDDY SIMULATION OF TURBULENT COMBUSTION Large eddy simulation (les) stands in the middle of the range of turbulent °ow At present, most large eddy simulations of turbulent combustion in complex {5{geometries have not been subject to comprehensive validation against experimen-. @article{osti_, title = {Large eddy simulations of a transcritical round jet submitted to transverse acoustic modulation}, author = {Gonzalez-Flesca, M. and CNES DLA, 52 Rue Jacques Hillairet, Paris Cedex and Schmitt, T. and Ducruix, S. and Candel, S.}, abstractNote = {This article reports numerical computations of a turbulent round jet of transcritical fluid (low temperature.

    Large-Eddy Simulation for Acoustics Edited by CLAUS WAGNER German Aerospace Center Definition History Aeroacoustics Conceptual approaches Remaining problem areas for sound computation State of the art: LES for acoustics Claus Wagner, Oliver Fleig, and Thomas Huttl ¨ Broadband noise prediction in general Broadband noise. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect.

    Designers and researchers have intensified the use of large-eddy simulation (LES) for noise reduced industrial design and acoustical research. This book, written by 30 experts, presents the theoretical background of acoustics and of LES, followed by details about numerical methods, e.g. discretization schemes, boundary conditions, coupling aspects.   The flow field is computed by large-eddy simulation (LES), while surface-pressure fluctuations obtained by the LES are used to predict the far-field sound. To deal with a moving boundary interface in the flow field, a form of the finite element method in which overset grids are applied from multiple dynamic frames of reference has been by:


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On the computation of sound by large-eddy simulations Download PDF EPUB FB2

The effect of the small scales on the source term in Lighthill's acoustic analogy is investigated, with the objective of determining the accuracy of large-eddy simulations when applied to studies of flow-generated sound. The distribution of the turbulent quadrupole is predicted accurately, if models that take into account the trace of the SGS stresses are by: Large Eddy Simulation (LES) of compressible flows is still a widely unexplored area of research.

The authors, whose books are considered the most relevant monographs in this field, provide the reader with a comprehensive state-of-the-art presentation of the available LES theory and by: Get this from a library.

On the computation of sound by large-eddy simulations. [Ugo Piomelli; Craig L Streett; S Sarkar; United States. National Aeronautics and Space Administration.]. out of 5 stars An atlas of large-eddy simulation Reviewed in the United States on June 2, This book presents the current status of Large-Eddy Simulation (LES) Cited by: Large Eddy Simulation (LES) is an approach to compute turbulent flows based on resolving the unsteady large-scale motion of the fluid while the impact of the small-scale turbulence on the large.

Large-Eddy Simulations for Acoustics the fluid–structure–acoustics interaction methodology was applied on the computation of the vibroacoustic sound radiation into a water filled cavity in. Large-eddy simulation (LES) was originally proposed for simulating atmospheric flows in the s and has become one of the most promising and successful methodology for simulating turbulent flows with the improvement of computing power.

It is now feasible to simulate complex engineering flows using by: Advances in Computation, Modeling and Control of Transitional and Turbulent Flows, pp.

() No Access Synchronized Large-Eddy Simulations for Sound Generation Analysis S. Unnikrishnan. Numerical Techniques for Direct and Large-Eddy Simulations - CRC Press Book Compared to the traditional modeling of computational fluid dynamics, direct numerical simulation (DNS) and large-eddy simulation (LES) provide a very detailed solution of the flow field by offering enhanced capability in predicting the unsteady features of the flow field.

A circular isothermal jet with a Mach number M = and a Reynolds number Re D = 4 × 10 5 is computed by large eddy simulation (LES) on two grids to investigate both the flow and the sound fields. Instead of an eddy-viscosity model, a filtering is applied explicitly to Cited by: Mathematics of Large Eddy Simulation of Turbulent Flows, First Edition SPIN Springer’s internal project number, if known – Monograph – Ap Springer Berlin Heidelberg NewYork Barcelona HongKong London Milan Paris Tokyo.

Computation of flow induced noise by large eddy simulation with Powell vortex sound theory and FW-H acoustic analogy 1. Computation of Flow Induced Noise by Large Eddy Simulation with Powell Vortex Sound Theory and FW-H Acoustic Analogy ZHANG Nan, ZHANG Xiaolong, WANG Xing, WU Baoshan, XIE Hua National Key Laboratory of Hydrodynamics, China Ship Scientific Research.

and large-eddy simulations of turbulent flows in different configurations. He has held visiting Remaining problem areas for sound computation 13 State of the art: LES for acoustics 15 Claus Wagner, Oliver Fleig, and Thomas Huttl¨ 15. In this paper numerical simulations are used to calculate the turbulence dynamics simultaneously with the sound field for a high-speed near-sonic (Ma=) compressible jet at two Reynolds numbers of 3, LES in conjunction with accurate numerical schemes is used to calculate the unsteady flow and sound in the near f'mld of.

Hadiabdié, K. Hanjalié; Direct Simulations of a Transitional Unsteady Impinging Hot Jet, by X. Jiang, H. Zhao, K. Luo; Part XI: Aeroacoustics: Basic Sound Radiation from Low Speed Coaxial Jets, by Mikel Alonso, Eldad J.

Avital; Use of surface integral methods in the computation of the acoustic far field of a turbulent jet, by P. Moore Price: $ Large Eddy Simulation (LES) of compressible flows is still a widely unexplored area of research. The authors, whose books are considered the most relevant monographs in this field, provide the reader with a comprehensive state-of-the-art presentation of the available LES theory and application.

This research involves computational study of free, heated jet flow and resultant far-field sound performed using large-eddy simulation (LES) and Lighthill's acoustic analogy. A subgrid-scale model for small-scale compressible turbulence was developed using a combination of the popular Smagorinsky model and a deductive model.

An existing software package for compressible flow field Author: David Brian Schein. CHAPTER LARGE EDDY SIMULATION Turbulent Flows Stephen B. Pope Cambridge University Press, °c Stephen B. Pope -2 0 2 4 r/∆ ∆ GFile Size: KB. simulations, only percent of the standard Roe flux-difference splitting dissipation is needed.

Nomenclature A area lal Roe flux-difference splitting matrix A s area of duct side walls c local speed of sound C SGS model constant *Trong T. Bui, Aerospace Engineer, AIAA member, ()e-mail: @ The current study presents the results of the aerodynamic noise prediction of the flow field around a NACA airfoil at a chord-based Reynolds number ofand at degree angle of attack.

An incompressible Large Eddy Simulation (LES) turbulence model is applied to obtain the instantaneous turbulent flow field. The noise prediction is performed by the Ffowcs Williams and Hawkings (FW Cited by: 3.

In the context of the RECORD FP7 european program, a test bench named CESAM-HP, located in the EM2C laboratory at Centrale Supélec, has been simulated using a Large Eddy Simulation code called AVBP.

Synchronized Large-Eddy Simulations for Sound Generation Analysis (S Unnikrishnan, D V Gaitonde) DNS of a Turbulent Jet Issuing from an Acoustically Lined Pipe (R D Sandberg, B J Tester) Decomposition of Radiating and Non-Radiating Linear Fluctuating Components in Compressible Flows (P Stegeman, A Ooi, J Soria).A detailed numerical study of turbulent flow through a micro-orifice is presented in this work.

The flow becomes turbulent due to the orifice at the considered Reynolds numbers (∼ 10 4). The obtained flow rates are in good agreement with the experimental measurements.

The discharge coefficient and the pressure loss are presented for two input pressures. The laminar stress and the generated Cited by: 4.