Results 31 to 40 of about 25,672 (196)

Large eddy simulation of two-dimensional isotropic turbulence [PDF]

, 1996
Large eddy simulation (LES) of forced, homogeneous, isotropic, two-dimensional (2D) turbulence in the energy transfer subrange is the subject of this paper.
A. Chekhlov, A. S. Monin, A. Yakhot, Alexei Chekhlov, Boris Galperin, D. Forster, G. E. Karniadakis, G. I. Sivashinsky, G. K. Batchelor, G. L. Browning, Ilya Staroselsky, J. A. Domaradzki, J. Smagorinsky, J. Smagorinsky, J. Sommeria, L. Smith, L. Smith, R. H. Kraichnan, R. H. Kraichnan, R. H. Kraichnan, R. H. Kraichnan, R. Sadourny, S. A. Orszag, S. Gama, S. Gama, Semion Sukoriansky, Steven A. Orszag, V. Yakhot, V. Yakhot, W. P. Dannevik, Y. Kuramoto   +30 more
core   +2 more sources

Assessment of Turbulence Models for Cylinder Flow Aeroacoustics

Aerospace
Numerical simulations are performed for flows over a circular cylinder at a Reynolds number ranging from 150 to 5000, and Mach number of 0.2, to assess the predictive capability of URANS and hybrid RANS/LES for acoustic waves generation and propagation ...
Xiao Wang, Shanti Bhushan, Adrian Sescu, Edward Luke, Bukhari Manshoor, Yuji Hattori   +5 more
doaj   +1 more source

Reduced chemical reaction mechanisms for simulating sodium emissions by solid-fuel combustion

Applications in Energy and Combustion Science, 2020
Starting from a reference and comprehensive chemical mechanism for alkali metal emissions (Glarborg and Marshall, 2005), combined with an hydrocarbon oxidation described with a skeleton mechanism (Kazakov and Frenklach, 1994), reduced and optimized ...
Kaidi Wan, Luc Vervisch, Zhenxun Gao, Pascale Domingo, Chongwen Jiang, Zhihua Wang, Jun Xia, Yingzu Liu, Kefa Cen   +8 more
doaj   +1 more source

Triple-deck and direct numerical simulation analyses high-speed subsonic flows past a roughness element [PDF]

, 2015
This paper is concerned with the boundary-layer separation in subsonic and transonic flows caused by a two-dimensional isolated wall roughness. The process of the separation is analysed by means of two approaches: the direct numerical simulation (DNS) of
Kravtsova, M, Mengaldo, G, Ruban, A, SHERWIN, S   +3 more
core   +1 more source

Experimental and CFD Characterization of a Double-Orifice Synthetic Jet Actuator for Flow Control

Actuators, 2021
The paper presents a joint experimental and numerical characterization of double-orifice synthetic jet actuators for flow control. Hot-wire measurements of the flow field generated by the device into a quiescent air environment were collected.
Andrea Palumbo, Luigi de Luca
doaj   +1 more source

Objective multiscale analysis of random heterogeneous materials [PDF]

, 2013
The multiscale framework presented in [1, 2] is assessed in this contribution for a study of random heterogeneous materials. Results are compared to direct numerical simulations (DNS) and the sensitivity to user-defined parameters such as the domain ...
Everdij, F. P. X., Lloberas Valls, Oriol, Rixen, D. J., Simone, A., Sluys, L. J.   +4 more
core  

DNS of the kappa-mechanism. I. Radial modes in the purely radiative case

, 2008
Context: Hydrodynamical model of the kappa-mechanism in a purely radiative case. Aims: First, to determine the physical conditions propitious to kappa-mechanism in a layer with a configurable conductivity hollow and second, to perform the (nonlinear ...
Arnoldi, B. Dintrans, Baker, Baker, Bono, Brandenburg, Böhm-Vitense, Carson, Cox, Cox, Dendy, Dintrans, Dyson, Eddington, Fukushima, Gautschy, Gehmeyr, Gilliland, Gough, Gough, Hansen, King, Kolláth, Kuhfuß, Lynden-Bell, Masalkar, Moler, Mulet-Marquis, Saarikoski, Seaton, Stellingwerf, Szabó, T. Gastine, Unno, Valdettaro, Vitense, Witelski, Wuchterl, Yecko, Zhevakin, Zhevakin   +40 more
core   +7 more sources

Turbulence Transitions in Kelvin–Helmholtz Instability “Tube” and “Knot” Dynamics: Vorticity, Helicity, and Twist Waves

Atmosphere, 2023
We address the sources and dynamics of vorticity and helicity and their relations in transitions to turbulence arising due to Kelvin–Helmholtz instability (KHI) “Tube” and “Knot” (T&K) events.
David C. Fritts, Thomas S. Lund, Adam C. Lund, Ling Wang   +3 more
doaj   +1 more source

Direct Numerical Simulation Code Validation for Compressible Shear Flows Using Linear Stability Theory

Journal of Aerospace Technology and Management, 2018
In order to simulate compressible shear flow stability and aeroacoustic problems, a numerical code must be able to capture how a baseflow behaves when submitted to small disturbances. If the disturbances are amplified, the flow is unstable.
Jônatas Ferreira Lacerda, Leandro Franco de Souza, Josuel Kruppa Rogenski, Márcio Teixeira de Mendonça   +3 more
doaj  

Direct Numerical Simulation DNS: Maximum Error as a Function of Mode Number [PDF]

, 2000
Numerical errors can be characterized in terms of algebraic polynomial approximation of a sine wave. The magnitude of the error will, therefore, depend on the energy at each mode in a Fourier expansion. Flows with a great deal of energy in the highest modes, such as Turbulence, are therefore the most difficult to approximate.
openaire   +2 more sources