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Search Publications by: Nicos Martys (Assoc)

Displaying 76 - 100 of 171

Computational Model Predictions of Suspension Rheology: Comparison to Experiment

July 25, 2007

Author(s)

Nicos Martys, Chiara F. Ferraris, V Gupta, Josephine H. Cheung

Predicting the rheological properties of fresh concrete, mortars, and cement paste from first principles remains a great challenge. While progress has been made in modeling the rheological properties of idealized hard sphere-like suspensions, there is

A Stokes Permeability Solver for Three-Dimensional Porous Media

April 4, 2007

Author(s)

Dale P. Bentz, Nicos Martys

A set of C and Fortran computer programs have been developed for computing the permeability of three-dimensional porous media under incompressible Stokes flow conditions. In this NISTIR, the background for developing these codes is reviewed and the

Report of Phase One Measurement and Analysis of Building Water System Contamination and Decontamination

July 3, 2006

Author(s)

Stephen J. Treado, Mark A. Kedzierski, Stephanie S. Watson, Dale P. Bentz, Nicos Martys, Kenneth D. Cole

This report describes the results of the first phase of a research project to evaluate how contaminants accidentally or intentionally introduced into the water supply might accumulate in building plumbing systems, and how these contaminants might be

Virtual Testing of Cement and Concrete

May 10, 2006

Author(s)

Dale P. Bentz, Edward J. Garboczi, Jeffrey W. Bullard, Chiara F. Ferraris, Nicos Martys, Paul E. Stutzman

Concrete is a unique multi-phase, random, complex, and composite material that provides both strength and impermeability to engineered structures. Unlike most construction materials, the properties of concrete continue to develop over time and in place an

Study of a Dissipative Particle Dynamics Based Approach for Modeling Suspensions.

December 1, 2005

Author(s)

Nicos Martys

A BBGKY-based density gradient approximation of interparticle forces: Application for discrete Boltzman methods

October 26, 2005

Author(s)

Nicos Martys

The force term accounting for intermolecular interactions, with application to discrete Boltzmann simulation methods, is derived directly using a density gradient expansion of the BBGKY collision operator. It is shown that previous calculations, based on

Cross-Property Correlations and Permeability Estimation in Sandstone

October 26, 2005

Author(s)

C H. Arns, M A. Knackstedt, Nicos Martys

Results from a numerical study examining the cross-property correlations linking fluid permeability to conductive properties and to a number of pore size parameters based on 3D digitized images of sedimentary rock are presented. In particular we focus on

Study of a Dissipative Particle Dynamics Based Approach for Modeling Suspensions

April 1, 2005

Author(s)

Nicos Martys

In this paper, a dissipative particle dynamics (DPD)-based approach for modeling suspensions is examined. A series of tests are applied comparing simulation results to well established theoretical predictions. The model recovers the dilute limit intrinsic