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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
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
Global stability of a lid-driven cavity with throughflow: Flow visualization studies
AIP Publishing - Tập 3 Số 9 - Trang 2081-2091 - 1991
Cyrus K. Aidun, Nicholas G. Triantafillopoulos, John D. Benson
Flow visualization studies of a lid-driven cavity (LDC) with a small amount of throughflow reveal multiple steady states at low cavity Reynolds numbers. These results show that the well-known LDC flow, which consists of a primary eddy and secondary corner eddies, is only locally stable, becomes globally unstable, and competes with at least three other steady states before being replaced by...... hiện toàn bộ
Transition to unsteady nonperiodic state in a through-flow lid-driven cavity
AIP Publishing - Tập 4 Số 10 - Trang 2316-2319 - 1992
John D. Benson, Cyrus K. Aidun
A flush-mounted hot-film anemometer is used to investigate the transition to unsteady flow in a lid-driven cavity with a small amount of through flow. The quantitative measurements with the hot-film probe confirm the transition from steady to time-periodic state from previous flow visualization studies and show a second transition in the primary state from time-periodic to quasiperiodic fl...... 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
Vortex splitting and its consequences in the vortex street wake of cylinders at low Reynolds number
AIP Publishing - Tập 1 Số 2 - Trang 189-192 - 1989
Holger Eisenlohr, Helmut Eckelmann
Based on the observation of vortex splitting in the laminar wake of thin flat plates placed parallel to the flow, an investigation on the consequences of such events for the von Kármán vortex street in the wake of circular cylinders was carried out. It was found that a ‘‘design break line’’ of vortex axes can lead to the decoupling of a wake flow from the always present disturbances derivi...... hiện toàn bộ
Heat/mass transfer from surface films to shear flows at arbitrary Peclet numbers
AIP Publishing - Tập 1 Số 7 - Trang 1112-1122 - 1989
Howard A. Stone
An efficient numerical method is described for studying the combined conductive and convective transport from a surface film on a planar boundary to a fluid in simple shear flow. Such problems arise most commonly in the use of hot film anemometers, electrochemical shear probes, or in simple models of chemical reactions. The method is illustrated by calculating the total flux (Nusselt numbe...... hiện toàn bộ
Development of turbulence models for shear flows by a double expansion technique
AIP Publishing - Tập 4 Số 7 - Trang 1510-1520 - 1992
Victor Yakhot, Steven A. Orszag, Siva Thangam, Gilmar Mompean, Charles G. Speziale
Turbulence models are developed by supplementing the renormalization group (RNG) approach of Yakhot and Orszag [J. Sci. Comput. 1, 3 (1986)] with scale expansions for the Reynolds stress and production of dissipation terms. The additional expansion parameter (η≡SK̄/■̄) is the ratio of the turbulent to mean strain time scale. While low-order expansions appear to provide an adequate descript...... hiện toàn bộ
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