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Author: nicos martys

Displaying records 61 to 70 of 73 records.
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61. 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

62. 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

63. 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

64. 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

65. 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

66. 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

67. 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

68. 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

69. Evaluation of the External Force Term in the Discrete Boltzmann Equation
Published: 11/1/1998
Authors: Nicos Martys, X Shan, H Chen
Abstract: A representation of the forcing term in the Boltzmann equation based on Hermite expansion of the Boltzmann distribution function in velocity phase space is derived. Based on this description of the forcing term, a systematic comparison of previous L ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860126

70. Real-World Considerations for Predicting Service Life of Steel-Reinforced Concrete Exposed to Chlorides
Published: Date unknown
Authors: Dale P Bentz, W. Spencer Guthrie, Scott Zachary Jones, Nicos Martys
Abstract: The prediction of concrete service life is of paramount importance for upgrading our nation‰s built infrastructure. Although computer models for predicting the service life of reinforced concrete exposed to chlorides (e.g., road salts) have been deve ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915806



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