William L. George

Computer Scientist, National Institute of Standards and Technology

Computational Rheology for Cement and Concrete

We present the current state of a long term research project at NIST that centers on the accurate modeling and simulation of the flow of dense suspensions such as cement, mortar, and concrete. We collaborate closely with researchers in the construction industry, as well as those in public sector agencies, to advance the state of the art in measurement science for these materials. Such advancements aid in the development of improved materials with respect to cost, service life, quality assurance, and predictability.

Our simulations, which currently utilize up to 32k processors on 'Intrepid', the IBM Blue Gene/P at the Argonne Leadership Computing Facility, enable us to explore the detailed motion of suspensions undergoing shear within an idealized parallel-plate rheometer (i.e. Couette flow) and also within a four-blade vane rheometer. The suspended particles range from idealized hard-spheres of varying size to realistic shaped rocks and sand particles, all suspended in either Newtonian or non-Newtonian fluids.

Biography

William George is a Computer Scientist in the Applied and Computational Mathematics Division of the Information Technology Laboratory at NIST. His research interests include parallel and distributed computing for scientific applications. His current focus is on the simulation of dense suspensions using dissipative particle dynamics (DPD) and smoothed particle hydrodynamics (SPH) techniques.

Workshop Program
updated: 2011-10-19