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15 results on '"Pearce, Jennifer Kreft"'

1. Time Dependence and Density Inversion in Simulations of Vertically Oscillated Granular Layers

Author

Bougie, J., Policht, Veronica, and Pearce, Jennifer Kreft

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

We study a layer of grains atop a plate which oscillates sinusoidally in the direction of gravity, using three-dimensional, time-dependent numerical solutions of continuum equations to Navier-Stokes order as well as hard-sphere molecular dynamics simulations. For high accelerational amplitudes of the plate, the layer exhibits a steady-state "density inversion" in which a high-density portion of the layer is supported by a lower-density portion. At low accelerational amplitudes, the layer exhibits oscillatory time dependence that is strongly correlated to the motion of the plate. We show that continuum simulations yield results consistent with molecular dynamics results in both regimes., Comment: 4 pages, 4 figures

Published
2011
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4. Separation of DNA by length in rotational flow: Lattice-Boltzmann-based simulations.

Author

Alfahani, Faihan, Antonelli, Michael, and Pearce, Jennifer Kreft

Subjects
ROTATIONAL flow, LATTICE Boltzmann methods, SIMULATION methods & models, DNA analysis, BIOMOLECULE analysis
Abstract

We use a lattice-Boltzmann based Brownian dynamics simulation to investigate the separation of different lengths of DNA through the combination of a trapping force and the microflow created by counter-rotating vortices. We can separate most long DNA molecules from shorter chains that have lengths differing by as little as 30%. The sensitivity of this technique is determined by the flow rate, size of the trapping region, and the trapping strength. We expect that this technique can be used in microfluidic devices to separate long DNA fragments that result from techniques such as restriction enzyme digests of genomic DNA. [ABSTRACT FROM AUTHOR]

Published
2015
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