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Friday, July 24, 2020 | History

3 edition of Numerical speed of sound and its application to schemes for all speeds found in the catalog.

Numerical speed of sound and its application to schemes for all speeds

Numerical speed of sound and its application to schemes for all speeds

  • 180 Want to read
  • 23 Currently reading

Published by National Aeronautics and Space Administration, Glenn Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va .
Written in English

    Subjects:
  • Acoustic velocity.,
  • High speed.,
  • Low speed.,
  • Multiphase flow.,
  • Turbulent flow.,
  • Inviscid flow.,
  • Ideal gas.

  • Edition Notes

    StatementMeng-Sing Liou, Jack R. Edwards.
    SeriesNASA/TM -- 1999-209286, NASA technical memorandum -- 209286..
    ContributionsEdwards, Jack R., NASA Glenn Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17136288M

    From the reviews of the first edition: "This book is directed to graduate students and research workers interested in the numerical solution of problems of fluid dynamics, primarily those arising in high speed flow. The book is well arranged, logically presented and well illustrated. It contains several FORTRAN programms with which students could experiment. The resulting field of speed of sound normalized by its maximum value in each engine regime is shown in Figure The top part of the plot corresponds to the flow solution of the low power engine regime, whereas the bottom part corresponds to that of the high power engine regime, as described in Section The lengths of the potential core.

    The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of exact value is defined as metres per second (approximately km/s, or mi/s).It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of . Be able to calculate values of sound speed based upon an understanding of temperature, pressure, and salinity effects. Know the basic thermal and sound-speed structure of the ocean and how field observations of sound speed are made. Be acquainted with the Ray Theory solution to the Wave Equation.

    The Hyperloop system is a new concept that allows a train to travel through a near-vacuum tunnel at transonic speeds. Aerodynamic drag is one of the most important factors in analyzing such systems. The blockage ratio (BR), pod speed/length, tube pressure, and temperature affect the aerodynamic drag, but the specific relationships between the drag and these parameters have . speed of sound Sound waves travel at approximately mph at sea level, but slow down at higher altitudes. The speed of sound is called "Mach 1." Supersonic refers to speeds from Mach 1 to Mach 5 (1 to 5 times the speed of sound), and hypersonic ranges from Mach 5 .


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Numerical speed of sound and its application to schemes for all speeds Download PDF EPUB FB2

Numerical Speed of Sound and its Applications to Schemes for all Speeds Meng-Sing Liou and Jack R. Edwards Numerical speed of sound; A USM + ; All speeds. Get this from a library. Numerical speed of sound and its application to schemes for all speeds. [Meng-Sing Liou; Jack R Edwards; NASA Glenn Research Center.].

Numerical speed of sound and its application to schemes for all speeds, AIAA paper Numerical Speed of Sound and its Application to Schemes for all Speeds.

gaining convergence rates for all speed ranges. We find that while the performance at high speed range is maintained, the flux now has the capability of performing well even with the low: speed flows. Thanks to the new numerical speed of sound, the convergence is even Author: Jack R.

Edwards and Meng-Sing Liou. Numerical speed of sound and its applications to schemes for all speeds. By Meng-sing Liou, Jack R. Edwards, Price Code A, As a l'esulI, the numerical dissipa-tion for low speed flows is scaled with the lo-cal fluid speed, rather than lhe sound speed.

Hence, the accuracy is enhanced, the correcl solution recovered, and the convergence. M.-S. Liou, J.R. Edwards, Numerical speed of sound and its application to schemes for all speeds, AIAA Paper CP, in:.

Liou, M.-S., Edwards, J.R.: Numerical speed of sound and its application to schemes for all speeds. 14th Computational Fluid Dynamics Conference, Norfolk, VA, AIAA PaperAlso published as NASA TM (). Lattice Boltzmann methods (LBM), originated from the lattice gas automata (LGA) method (Hardy-Pomeau-Pazzis and Frisch-Hasslacher-Pomeau models), is a class of computational fluid dynamics (CFD) methods for fluid d of solving the Navier–Stokes equations directly, a fluid density on a lattice is simulated with streaming and collision (relaxation).

The results show a little difference when the speeds of sound are applied to the Roe's scheme and Advection Upstream Splitting Method (AUSM) scheme, but a numerical instability is observed for a.

Simulation of Flows at All Speeds with High-Order WENO Schemes and Preconditioning. Large Eddy Simulations of Wall-Bounded Turbulent Flows Using a Semi-Implicit Numerical Scheme. Numerical speed of sound and its application to schemes for all speeds. The CESTAC method (Contrôle et Estimation STochastique des Arrondis de Calcul) has been developped within the last 15 years by J.

Vignes and the late M. La Porte and their this method the number of decimal significant figures on the numerical result on of any floating point computation can be obtained with a certainty of 95%. The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

At 20 °C (68 °F), the speed of sound in air is about metres per second (1, km/h; 1, ft/s; mph; kn), or a kilometre in s or a mile in depends strongly on temperature as well as the medium through which a sound wave is.

An all speed scheme for the Isentropic Euler equation is presented in this paper. When the Mach number tends to zero, the compressible Euler equation converges to its incompressible counterpart, in which the density becomes a constant.

Increasing approximation errors and severe stability constraints are the main difficulty in the low Mach regime. This book consists of 37 articles dealing with simulation of incompressible flows and applications in many areas.

It covers numerical methods and algorithm developments as well as applications in aeronautics and other areas. It represents the state of the art in the field. Then, the maximum wind speed ratio and its corresponding azimuth were identified.

Second, the sound pressure levels in the vicinity of the shading devices with two types of perforation plate schemes were calculated to evaluate the acoustic characteristics by using the FW-H equation to simulate sound generation and propagation.

Mach is half the speed of sound, Mach 2 is twice the speed of sound, and so on. Speeds less than the speed of sound have a Mach number between zero and one and are described as subsonic. Those greater than the speed of sound have Mach numbers greater than one are a described as supersonic.

Currently, researches on the acoustic radiation efficiency and sound insulation performance of the micro-perforated plate mainly focused on the experimental test, and the numerical simulation is rarely reported.

In this paper, firstly, the discrete element method was applied to test the acoustic radiation efficiency of the micro-perforated plate. common time step Δt for all pipe sections of the system. A way of solution to this problem is applying the method of the wave−speed adjustment that involves modifying the value of a in each pipe section in a certain percentage up to obtain C n = 1.

With this procedure optimum results are guaranteed in numerical terms, but it is possible to say. Time-domain Numerical Solution of the Wave Equation Jaakko Lehtinen∗ February 6, Abstract This paper presents an overview of the acoustic wave equation and the common time-domain numerical solution strategies in closed environments.

First, the wave equation is presented and its qualities analyzed. Common principles of numerical. Despite these numerical studies, dynamics of the cavitation and its radiated noise are still difficult to understand using the numerical approaches. In particular, the application of numerical schemes and techniques, which are derived from single-phase tests, on multi-phase problems has ambiguity issues.

The rms fractional difference between the calculated and the measured sound speeds is % for all solar radii between between R and R and is % for the deep interior region, r R, in which neutrinos are produced. Taken from Figure 10 of ``Solar Models: current epoch and time dependences, neutrinos, and helioseismological.

This assumption rules out using the model for any scenario involving flow speeds approaching the speed of sound, such as explosions, choke flow at nozzles, and detonations. Rectilinear geometry. The efficiency of FDS is due to the simplicity of its rectilinear numerical grid and the use of a fast, direct solver for the pressure field.Additionally, the instantaneous speed signals of double encoders at an input speed of 17 Hz are analyzed, and the spectra of the differential signals of the instantaneous speeds are given in Figure 8.

For the input speed of 17 Hz, three frequency components (input frequency 17 Hz, lay frequency Hz, and output frequency Hz) are observed.