HR: 14:00h
AN: U33A-03    [Abstracts]
TI: Linear-to-Volcanic Response in a Self-Organizing Driven Fluid Mixture by an Interacting Lattice Gas Computer Simulation
AU: * Pandey, R B
EM: ras.pandey@usm.edu
AF: Naval Research Laboratory, Code 7432, Stennis Space Center, MS 39529 United States
AU: * Pandey, R B
EM: ras.pandey@usm.edu
AF: University of Southern Mississippi, Department of Physics, Hattiesburg, MS 39406 United States
AU: Gettrust, J F
EM: gettrust@nrlssc.navy.mil
AF: Naval Research Laboratory, Code 7432, Stennis Space Center, MS 39529 United States
AB: A computer simulation model is used to study the transport, flow, and self-organizing morphology in a multi-component fluid mixture. We consider a mixture of two immiscible components (A, B) driven by a hydrostatic pressure bias from a source (reservoir) at the bottom on a cubic lattice. Mobile particles (A, B - representing heavier gas hydrate/sediment particles and fluid) in equal number are distributed randomly on half of the lattice sites initially where a site cannot be occupied by more than one particle. The empty (pore) sites can act as a component of an effective medium. A set of interactions among these constituents is considered in addition to excluded volume hard-core interaction. The hydrostatic pressure bias (H) is implemented probabilistically to drive particles (A, B) against gravity. We use the Metropolis algorithm to move these particles stochastically. Periodic boundary conditions are used along the transverse directions while the longitudinal ends (top and bottom) are open. Thus, particles can escape from the top or bottom; however, they can enter the lattice only from the source at the bottom in this model. The probability of release of constituents (A, B) depend on their current relative concentrations in the lattice. Particles flow, re-distribute, and their concentrations change as the simulation proceeds. The flux rate of particle flow becomes constant and the morphology become stable in the long time steady-state limit. We observe a variety of self-organized structures, which exhibit dense phase at the bottom and dilute (gaseous) phase on the top with a bi-continuous phase in between. The flux rate (j) shows linear response at low hydrostatic bias but is different for constituents (A, B) with different molecular weight. The response becomes non-linear in high-bias regime; there it diverges (essentially erupts) for higher molecular weight components while it decreases for the lighter component.
DE: 0930 Oceanic structures
DE: 4219 Continental shelf processes
DE: 4806 Carbon cycling
DE: 7843 Numerical simulation studies
SC: Union [U]
MN: 2005 Joint Assembly