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Author: nicos martys

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51. A New Approach to Lattice Boltzmann Simulation
Published: 10/1/2001
Author: Nicos Martys
Abstract: A new approach to lattice Boltzmann simulation is introduced which avoids the direct numerical determination of the single-particle distribution from the Boltzmann collision operator. Instead, one starts from the Chapman-Enskog expansion of the sing ...

52. De la Pate de Ciment au Beton: Modlisation et Mesures Exprimentales des Proprietes Rhologiques. [Cement Paste to the Concrete Modisation and Measure Experimental of the Properties Rheology.]
Published: 10/1/2001
Authors: Chiara F Ferraris, Nicos Martys
Abstract: The prediction of concrete rheological properties is essential for the correct use of the material. The composition of the concrete is nowadays complex. It is not limited to cement, aggregates and water but also includes admixtures and fillers. Ther ...

53. Improved Approximation of the Brinkman Equation using a Lattice Boltzmann Method
Published: 6/1/2001
Author: Nicos Martys
Abstract: In this brief communication, a new approach to generalize the lattice Boltzmann method to produce fluid flow consistent with the Brinkman equation is presented. The method described in this communication both eliminates second order errors in veloci ...

54. Acquiring, Analyzing, and Using Complete Three-Dimensional Aggregate Shape Information
Published: 4/1/2001
Authors: Edward Joseph Garboczi, Nicos Martys, H A Saleh, Richard A Livingston
Abstract: The shape of aggregates, from whatever source, plays a crucial role in determining the properties of the composite material in which they are embedded (e.g., asphaltic or portland cement concrete). To properly characterize this three-dimensional sha ...

55. Critical Properties and Phase Separation in Lattice Boltzmann Fluid Mixtures
Published: 3/1/2001
Authors: Nicos Martys, Jack F Douglas
Abstract: Basic equilibrium properties of Lattice Boltzmann (LB) fluid mixtures (coexistence curve, surface tension, interfacial profile, correlation length) are calculated to characterize the critical phenomena occurring in these model liquids and to establis ...

56. Critical Properties and Phase Separation in Lattice Boltzmann Fluid Mixtures
Published: 1/1/2001
Authors: Nicos Martys, Jack F Douglas

57. Accelerating Scientific Discovery through Computation and Visualization
Series: Journal of Research (NIST JRES)
Published: 11/1/2000
Authors: James S Sims, John G Hagedorn, Peter M. Ketcham, Steven G Satterfield, Terence J. Griffin, William L George, H A Fowler, B A am Ende, Howard Hung, Robert B Bohn, John E Koontz, Nicos Martys, Charles E. Bouldin, James A Warren, D L Feder, Charles W Clark, Bernard J Filla, Judith Ellen Terrill
Abstract: The rate of scientific discovery can be accelerated through computation and visualization. This acceleration results from the synergy of expertise, computing tools, and hardware for enabling high performance computation, information science, and visu ...

58. User's Guide to the NIST Virtual Cement and Concrete Testing Laboratory. Version 1.0
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6583
Published: 11/1/2000
Authors: Jeffrey W Bullard, Chiara F Ferraris, Edward Joseph Garboczi, Nicos Martys, Paul E Stutzman
Abstract: This NISTIR serves as the user's manual for Version 1.0 of the Virtual Cement and Concrete Testing Laboratory (VCCTL). Using the VCCTL, a user may create starting microstructures of cement (gypsum, fly ash, etc.) particles in water, hydrate the micr ...

59. Using Impedance Spectroscopy to Assess the Viability of the Rapid Chloride Test for Determining Concrete Conductivity
Series: Journal of Research (NIST JRES)
Published: 7/1/2000
Authors: Kenneth Alan Snyder, Chiara F Ferraris, Nicos Martys, Edward Joseph Garboczi
Abstract: The suitability of using the initial current from the rapid chloride test (ASTM C 1202) to determine specimen conductivity is tested using impedance spectroscopy with a frequency spectrum of 10 Hz to 1 MHz. The specimen conductivity has an analytica ...

60. Simulation of Fluid Flow and Permeability in Cohesionless Soils
Published: 4/1/2000
Authors: E Masad, B Muhunthan, Nicos Martys
Abstract: This paper reports on a new laboratory methodology for the determination of the structure of pores, a method for the analysis of the data to obtain the statistics of the pore structure distribution, simulation of porous media with statistics consiste ...

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