AIP Publishing
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The configurations of a FENE bead-spring chain in transient rheological flows and in a turbulent flowThe 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
AIP Publishing - Tập 5 Số 4 - Trang 881-890 - 1993
A proposed modification of the Germano subgrid-scale closure methodThe 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.
AIP Publishing - Tập 4 Số 3 - Trang 633-635 - 1992
A note on memory-integral contributions to the force on an accelerating spherical drop at low Reynolds numberThe hydrodynamic force on a spherical drop that undergoes a translational acceleration in an unbounded fluid at low Reynolds number is considered. The force involves a memory-integral contribution that is not of the familiar form for a solid sphere. This result, in conjunction with the prior results of Lawrence and Weinbaum [J. Fluid Mech. 171, 208 (1986)] for a nonspherical particle, sugg... ... hiện toàn bộ
AIP Publishing - Tập 3 Số 7 - Trang 1822-1824 - 1991
Nonlinear rupture of free filmsA free viscous film is subject to van der Waals attractions that lead to film rupture. Long-wave asymptotics is used to derive approximate equations that govern the unstable evolution of the film. The solution of the nonlinear evolution equation is then considered using bifurcation techniques leading to an estimate for the nonlinear rupture time.
AIP Publishing - Tập 5 Số 5 - Trang 1117-1122 - 1993
Molecular dynamics of interface ruptureSeveral 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
AIP Publishing - Tập 5 Số 3 - Trang 521-536 - 1993
Vortex splitting and its consequences in the vortex street wake of cylinders at low Reynolds numberBased 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
AIP Publishing - Tập 1 Số 2 - Trang 189-192 - 1989
Spectral features of wall pressure fluctuations beneath turbulent boundary layersExperimental 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
AIP Publishing - Tập 3 Số 10 - Trang 2410-2420 - 1991
Local energy transfer and nonlocal interactions in homogeneous, isotropic turbulenceDetailed 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
AIP Publishing - Tập 2 Số 3 - Trang 413-426 - 1990
A dynamic mixed subgrid-scale model and its application to turbulent recirculating flowsThe 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
AIP Publishing - Tập 5 Số 12 - Trang 3186-3196 - 1993
Subgrid-scale backscatter in turbulent and transitional flowsMost 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
AIP Publishing - Tập 3 Số 7 - Trang 1766-1771 - 1991
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