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Готові списки джерел за темами / Low Mach assumption

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Статті в журналах

Добірка наукової літератури з теми "Low Mach assumption"

Автор: Grafiati

Опубліковано: 20 лютого 2024

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Статті в журналах з теми "Low Mach assumption"

1

Fu, Jian-Ming, Hai-Min Tang, and Hong-Quan Chen. "Rapid computation of rotary derivatives for subsonic and low transonic flows." Engineering Computations 36, no. 9 (2019): 3108–21. http://dx.doi.org/10.1108/ec-09-2018-0399.

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Purpose The purpose of this paper is to develop a new approach for rapid computation of subsonic and low-transonic rotary derivatives with the available steady solutions obtained by Euler computational fluid dynamics (CFD) codes. Design/methodology/approach The approach is achieved by the perturbation on the steady-state pressure of Euler CFD codes. The resulting perturbation relation is established at a reference Mach number between rotary derivatives and normal velocity on surface due to angular velocity. The solution of the reference Mach number is generated technically by Prandtl–Glauert c

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2

Zhang, Zhicheng, Yuhong Li, Étienne Spieser, Peng Zhou, and Xin Zhang. "An improved artificial compressibility method for aeroacoustics at low Mach numbers." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 5 (2023): 3025–33. http://dx.doi.org/10.3397/in_2023_0437.

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This work presents an improved artificial compressibility method that enables correct sound propagation behaviour in low Mach number flows. As an extension of incompressible approaches, it offers the advantage of low computational costs since compressible flow equations are simplified under the isentropic assumption, and the coupling of flow and sound is preserved. The non-uniform speed of sound is considered in this method, and eigenvalue analysis of the modified governing equations reveals that the propagation speed of pseudo waves restores to that of physical acoustic waves. The effect of M

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3

HULSHOFF, S. J., A. HIRSCHBERG, and G. C. J. HOFMANS. "Sound production of vortex–nozzle interactions." Journal of Fluid Mechanics 439 (July 23, 2001): 335–52. http://dx.doi.org/10.1017/s0022112001004554.

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The factors which affect the sound production of a vortex as it passes through a nozzle are investigated at both low and high Mach numbers using time-accurate inviscid-flow computations. Vortex circulation, initial position, and mean-flow Mach number are shown to be the primary factors which influence the amplitude and phase of the sound produced. Nozzle geometry and distribution of vorticity are also shown to play significant roles in determining the detailed form of the signal. Additionally, it is shown that solution bifurcations are possible at sufficiently large values of vortex circulatio

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4

Donzis, Diego A., and Shriram Jagannathan. "Fluctuations of thermodynamic variables in stationary compressible turbulence." Journal of Fluid Mechanics 733 (September 23, 2013): 221–44. http://dx.doi.org/10.1017/jfm.2013.445.

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AbstractA large database of new direct numerical simulations of forced compressible turbulence on up to $204{8}^{3} $ grids, and a range of Reynolds (${R}_{\lambda } $) and turbulent Mach (${M}_{t} $) numbers, is analysed to study the scaling of pressure, density and temperature fluctuations. Small-perturbation analysis is used to study the scaling of variances, and different cross-correlations as well as spectra. Qualitative differences are observed between low and high ${M}_{t} $. The probability density functions (p.d.f.s) of pressure and density are negatively skewed at low ${M}_{t} $ (con

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5

Freitas Rachid, Felipe B., and Heraldo S. Costa Mattos. "On the Suitability of the Low Mach Number Assumption in the Modeling of the Damage Induced by Pressure Transients in Piping Systems." Journal of Fluids Engineering 121, no. 1 (1999): 112–17. http://dx.doi.org/10.1115/1.2821990.

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One-dimensional models for predicting the damage induced by pressure transients in piping systems conveying liquids have been proposed and analysed recently. However, such works have been concerned mainly with the adequacy of the constitutive equations adopted for different pipe materials and with the numerical techniques used for approximating the solution of the resulting mathematical problems. In the present paper the suitability of the simplifying low Mach number assumption adopted in the modeling is investigated. The analysis is carried out based on the eigenvalue problem associated to th

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6

FREUND, JONATHAN B. "Noise sources in a low-Reynolds-number turbulent jet at Mach 0.9." Journal of Fluid Mechanics 438 (July 5, 2001): 277–305. http://dx.doi.org/10.1017/s0022112001004414.

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The mechanisms of sound generation in a Mach 0.9, Reynolds number 3600 turbulent jet are investigated by direct numerical simulation. Details of the numerical method are briefly outlined and results are validated against an experiment at the same flow conditions (Stromberg, McLaughlin & Troutt 1980). Lighthill's theory is used to define a nominal acoustic source in the jet, and a numerical solution of Lighthill's equation is compared to the simulation to verify the computational procedures. The acoustic source is Fourier transformed in the axial coordinate and time and then filtered in ord

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7

Skalidis, R., J. Sternberg, J. R. Beattie, V. Pavlidou, and K. Tassis. "Why take the square root? An assessment of interstellar magnetic field strength estimation methods." Astronomy & Astrophysics 656 (December 2021): A118. http://dx.doi.org/10.1051/0004-6361/202142045.

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Context. The magnetic field strength in interstellar clouds can be estimated indirectly from measurements of dust polarization by assuming that turbulent kinetic energy is comparable to the fluctuating magnetic energy, and using the spread of polarization angles to estimate the latter. The method developed by Davis (1951, Phys. Rev., 81, 890) and by Chandrasekhar and Fermi (1953, ApJ, 118, 1137) (DCF) assumes that incompressible magnetohydrodynamic (MHD) fluctuations induce the observed dispersion of polarization angles, deriving B ∝ 1∕δθ (or, equivalently, δθ ∝ MA, in terms of the Alfvénic Ma

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8

Lee, Incheol, and Duck Joo Lee. "Investigation on the Source Locations of Axisymmetric Screech Tones Utilizing Data from Numerical Simulation." Journal of Theoretical and Computational Acoustics 27, no. 04 (2019): 1850058. http://dx.doi.org/10.1142/s2591728518500585.

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The source locations of axisymmetric modes of screech tones are numerically investigated. Fourth-order optimized compact scheme and fourth-order Runge–Kutta method are used to solve the 2-D axisymmetric Euler equations. The screech tone is successfully reproduced, and the change in wavelength with respect to jet Mach number shows good agreement with the experimental data. At various low supersonic jet Mach numbers, the time-averaged contours of Mach number and root-mean-square pressure are investigated to identify the location of maximum interaction between shock cell structures and vortices.

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9

Ouajdi, Sanae, Fayçal Moufekkir, Ahmed Mezrhab, and Jean Pierre Fontaine. "Numerical Method of Weakly Compressible Poiseuille Flow Using Lattice Boltzmann Method." Defect and Diffusion Forum 384 (May 2018): 99–116. http://dx.doi.org/10.4028/www.scientific.net/ddf.384.99.

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The present work focuses on the numerical simulation of isothermal and weakly compressible Poiseuille flow in a planar channel using the Lattice Boltzmann method with multiple times of relaxation (MRT-LBE) coupled to the Finite Difference method (FDM). The active fluid considered is the air under low Mach number assumption. The flow is two-dimensional, laminar and all the physical properties are constants except the density which varies in the sense of the Boussinesq approximation. The effects of the compressibility, the inclination angle and the Reynolds number on the dynamical and thermal fi

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10

Almagro, Antonio, Manuel García-Villalba, and Oscar Flores. "A numerical study of a variable-density low-speed turbulent mixing layer." Journal of Fluid Mechanics 830 (October 2, 2017): 569–601. http://dx.doi.org/10.1017/jfm.2017.583.

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Direct numerical simulations of a temporally developing, low-speed, variable-density, turbulent, plane mixing layer are performed. The Navier–Stokes equations in the low-Mach-number approximation are solved using a novel algorithm based on an extended version of the velocity–vorticity formulation used by Kim et al. (J. Fluid Mech., vol 177, 1987, 133–166) for incompressible flows. Four cases with density ratios $s=1,2,4$ and 8 are considered. The simulations are run with a Prandtl number of 0.7, and achieve a $Re_{\unicode[STIX]{x1D706}}$ up to 150 during the self-similar evolution of the mixi

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