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Subgrid-scale backscatter in turbulent and transitional flows
AIP Publishing - Tập 3 Số 7 - Trang 1766-1771 - 1991
Ugo Piomelli, W. Cabot, Parviz Moin, Sangsan Lee
Most subgrid-scale (SGS) models for large-eddy simulations (LES) are absolutely dissipative (that is, they remove energy from the large scales at each point in the physical space). The actual SGS stresses, however, may transfer energy to the large scales (backscatter) at a given location. Recent work on the LES of transitional flows [Piomelli et al., Phys. Fluids A 2, 257 (1990)] has shown...... hiện toàn bộ
A dynamic mixed subgrid-scale model and its application to turbulent recirculating flows
AIP Publishing - Tập 5 Số 12 - Trang 3186-3196 - 1993
Yan Zang, Robert L. Street, Jeffrey R. Koseff
The dynamic subgrid-scale eddy viscosity model of Germano et al. [Phys. Fluids A 3, 1760 (1991)] (DSM) is modified by employing the mixed model of Bardina et al. [Ph.D dissertation, Stanford University (1983)] as the base model. The new dynamic mixed model explicitly calculates the modified Leonard term and only models the cross term and the SGS Reynolds stress. It retains the favorable fe...... hiện toàn bộ
Electroconvection at an electrically inhomogeneous permselective interface
AIP Publishing - Tập 3 Số 10 - Trang 2301-2309 - 1991
Isaak Rubinstein
This paper concerns electroconvection—a nongravitational free convection in macroscopic domains of electrolyte solution. Electroconvection results from the interaction of the electric field in the system with the respective space charge within the limits of validity of local electroneutrality approximation. It follows from the dimensional analysis that the electroconvectional Péclet number...... hiện toàn bộ
A proposed modification of the Germano subgrid-scale closure method
AIP Publishing - Tập 4 Số 3 - Trang 633-635 - 1992
Douglas K. Lilly
The subgrid-scale closure method developed by Germano et al. is modified by use of a least squares technique to minimize the difference between the closure assumption and the resolved stresses. This modification removes a source of singularity and is believed to improve the method’s applicability.
Models for direct Monte Carlo simulation of coupled vibration–dissociation
AIP Publishing - Tập 5 Số 2 - Trang 478-489 - 1993
Brian L. Haas, Iain D. Boyd
Models are developed to permit direct Monte Carlo techniques to simulate coupled vibration–dissociation (CVD) behavior prevalent in high-temperature gases. This transient thermochemical phenomenon leads to dissociation incubation, reduced quasisteady dissociation rates, and non-Boltzmann distributions of vibrational energy during both dissociation and recombination. Essential for simulatio...... hiện toàn bộ
Resolution of differences between collision number definitions in particle and continuum simulations
AIP Publishing - Tập 3 Số 9 - Trang 2282-2284 - 1991
Forrest Lumpkin, Brian L. Haas, Iain D. Boyd
The use of the same symbol, Z, representing a ‘‘collision number’’ for thermal relaxation, has lead to confusion regarding its definition in the context of both continuum and particle simulations. Examination of the relaxation mechanics employed in particle simulations demonstrates that these definitions differ by a numerical factor that depends upon the intermolecular potential. Particle ...... hiện toàn bộ
Molecular dynamics of interface rupture
AIP Publishing - Tập 5 Số 3 - Trang 521-536 - 1993
Joel Koplik, Jayanth R. Banavar
Several situations have been studied in which a fluid–vapor or fluid–fluid interface ruptures, using molecular dynamics simulations of 3000 to 20 000 Lennard-Jones molecules in three dimensions. The cases studied are the Rayleigh instability of a liquid thread, the burst of a liquid drop immersed in a second liquid undergoing shear, and the rupture of a liquid sheet in an extensional flow....... hiện toàn bộ
Numerical solution and analysis of asymmetric convention in a vertical cylinder: An effect of Prandtl number
AIP Publishing - Tập 1 Số 8 - Trang 1348-1359 - 1989
Emilia Crespo del Arco, Patrick Bontoux
Three-dimensional steady flows are simulated with a finite-difference technique in a cylinder of height-to-radius ratio A=4 heated from below. Basic axisymmetric (m=0) and asymmetric (m=1,2) modes are identified in the solutions. The relative contributions of these modes to the supercritical flow are assessed for Rayleigh numbers up to Ra≅10 Rac at Prandtl number Pr=6.7 and Ra≅2.5 Rac at P...... hiện toàn bộ
Preferential concentration of particles by turbulence
AIP Publishing - Tập 3 Số 5 - Trang 1169-1178 - 1991
Kyle D. Squires, John K. Eaton
Direct numerical simulation of isotropic turbulence was used to investigate the effect of turbulence on the concentration fields of heavy particles. The hydrodynamic field was computed using 643 points and a statistically stationary flow was obtained by forcing the low-wave-number components of the velocity field. The particles used in the simulations were time advanced according to Stokes...... hiện toàn bộ
On streamwise vortices in turbulent wakes of cylinders
AIP Publishing - Tập 5 Số 2 - Trang 387-392 - 1993
Byram Bays-Muchmore, A. Ahmed
Flow-visualization methods were used to explore the structure of streamwise vortices and their interactions with the von Kármán vortices in the immediate wakes of cylinders. The experiments were conducted in a water tunnel at Reynolds numbers from 330–21 000 based on cylinder diameter. Over this entire range of Reynolds number, pairs of counter-rotating streamwise vortices were observed im...... hiện toàn bộ
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