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Author: nicos martys

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61. Energy Conserving Discrete Equation for Non-Ideal Systems
Published: 10/20/1999
Author: Nicos Martys
Abstract: The BBGKY formalism is utilized to obtain a set of moment equations to be satisfied so as to obtain an energy conserving discrete Boltzmann equation for the case of a non-local interaction potential. A modified BGK form of the collision operator con ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860155

62. Diffusion in Partially Saturated Porous Materials
Published: 10/1/1999
Author: Nicos Martys
Abstract: The diffusive transport of ions in two classes of porous media was studied as a function of fluid saturation and wetting properties. A lattice Boltzmann method was used to model phase separation of a binary mixture, including wetting effects, in por ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860120

63. Energy Conserving Discrete Boltzmann Equation for Nonideal Systems
Published: 10/1/1999
Author: Nicos Martys
Abstract: The BBGKY formalism is utilized to obtain a set of moment equations to be satisfied by the collision operator in an energy conserving discrete Boltzmann equation for the case of a nonlocal interaction potential. A modified BGK form of the collision o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860159

64. Pore Scale Modeling of Fluid Transport Using Lattice Boltzmann Methods
Published: 10/1/1999
Authors: Nicos Martys, John G Hagedorn, J E Devaney
Abstract: The utility of the lattice Boltzmann method for modeling fluid flow in complex geometries like porous materials is examined. After study of some simple test cases, results from large scale simulations of fluid flow through digitized Fontainbleau sand ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860210

65. Digital Images and Computer Modelling
Published: 7/1/1999
Authors: Edward Joseph Garboczi, Dale P Bentz, Nicos Martys
Abstract: This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real mater ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860146

66. Large Scale Simulations of Single and Multi-Component Flow in Porous Media
Published: 7/1/1999
Authors: Nicos Martys, John G Hagedorn, D S. Goujon, J E Devaney
Abstract: We examine the utility of the lattice Boltzmann method for modeling fluid flow in large microstructures. First, results of permeability calculations are compared to predicted values for several idealized geometries. Large scale simulations of fluid ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860203

67. Lattice Boltzmann Simulations of Single and Multi-Component Flow in Porous Media
Published: 7/1/1999
Authors: Nicos Martys, John G Hagedorn, J E Devaney
Abstract: We examine the utility of the lattice Boltzmann method for modeling fluid flow in porous media. First the lattice Boltzmann method is validated for the case of single component flow in several idealized flow geometries. Large scale simulations of f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860261

68. Mean-Field-Scaling in Lattice Boltzmann Fluid Mixtures
Published: 6/1/1999
Authors: Nicos Martys, Jack F Douglas
Abstract: Basic equilibrium properties of Lattice Boltzmann (LB) fluid mixtures (coexistence curve, surface tension, and interfacial profile) are calculated to characterize the critical phenomena occurring in these model liquids and to establish a reduced vari ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860180

69. Velocity Verlet Algorithm for Dissipative Particle-Dynamics-Based Models of Suspensions
Published: 3/1/1999
Authors: Nicos Martys, Raymond Dale Mountain
Abstract: A velocity Verlet algorithm for velocity dependent forces is described for modeling a suspension of rigid body inclusions. The rigid body motion is determined from the quaternion-based scheme of Omelyan [Comput. Phys. 12, 97 (1998)]. An iterative m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860163

70. Thermal Lattice Boltzmann Models (TLBM) for Compressible Flows
Published: 12/1/1998
Authors: G Vahala, P Pavlo, L Vahala, Nicos Martys
Abstract: The progress and challenges in thermal lattice Boltzmann modeling are discussed. In particular, momentum and energy closures schemes are contrasted. Higher order symmetric (but no longer space filling) velocity lattices are constructed for both 2D ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860157



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