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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
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
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
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
The configurations of a FENE bead-spring chain in transient rheological flows and in a turbulent flow
AIP Publishing - Tập 5 Số 4 - Trang 881-890 - 1993
H. Massah, K. Kontomaris, W. R. Schowalter, Thomas J. Hanratty
The changes in the configuration of a FENE bead-spring chain in a direct numerical simulation of turbulent channel flow and in some simple rheological flows are examined. Unraveling occurs both in uniaxial and shear flows, but the uniaxial flow is more effective. A vortex with a large rotation rate perpendicular to the principal strain of a uniaxial flow has only a minor retarding effect w...... hiện toàn bộ
Spectral features of wall pressure fluctuations beneath turbulent boundary layers
AIP Publishing - Tập 3 Số 10 - Trang 2410-2420 - 1991
Theodore M. Farabee, M. J. Casarella
Experimental measurements of the frequency spectra and frequency cross-spectra of the wall pressure fluctuations beneath a turbulent boundary layer were made in a low-noise flow facility. The data, taken over a range of flow speeds, clearly display a dimensionless frequency (ωδ/uτ=50) at which the spectra achieve a maximum and a low-frequency range with an approximately ω2 rolloff. The sca...... hiện toàn bộ
A lattice Boltzmann model for multiphase fluid flows
AIP Publishing - Tập 5 Số 10 - Trang 2557-2562 - 1993
Daryl Grunau, Shiyi Chen, K. Eggert
A lattice Boltzmann equation method for simulating multiphase immiscible fluid flows with variation of density and viscosity, based on the model proposed by Gunstensen et al. for two-component immiscible fluids [Phys. Rev. A 43, 4320 (1991)] is developed. The numerical measurements of surface tension and viscosity agree well with theoretical predictions. Several basic numerical tests, incl...... hiện toàn bộ
Local energy transfer and nonlocal interactions in homogeneous, isotropic turbulence
AIP Publishing - Tập 2 Số 3 - Trang 413-426 - 1990
J. Andrzej Domaradzki, R. S. Rogallo
Detailed computations were made of energy transfer among the scales of motion in incompressible turbulent fields at low Reynolds numbers generated by direct numerical simulations. It was observed that although the transfer resulted from triad interactions that were nonlocal in k space, the energy always transferred locally. The energy transfer calculated from the eddy-damped quasinormal Ma...... 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
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