Dr. Nicos S. Martys

Materials and Structural Systems Division

Engineering Laboratory

100 Bureau Drive, Stop 8615

National Institute of Standards and Technology

Gaithersburg, MD 20899 USA

(301) 975-5915

FAX: (301) 990-6891

Dr. Martys joined the Inorganic Building Materials Group of the Building Materials Division in October 1992. Dr. Martys research interests include mesoscopic modelling of complex fluids, the phase separation of fluids in confined geometries and under shear, moisture and diffuse transport porous materials.

Dr. Martys is currently developing computational models which describe the rheological properties of dense suspensions as a function of the shape and size distribution of the solid inclusions.

Phase separation of a binary mixture under shear.

A sheared suspension of ellipsoids.

Last revised 05/04/05

Martys, N.S.,
Study
of a dissipative particle dynamics based approach for modeling suspensions
Journal of Rheology, **49** (2), 401-424 (2005).

Arns, C.H., Knackstedt, M.A., Pinczewski, W.V. and Martys, N.S.,
"Virtual
permeametry on microtomographic images", Journal of Petroleum Science and
Engineering, **45** (1-2) 41-46 (2004).

Bullard, J.W., Ferraris, C., Garboczi, E.J., Martys, N.S. and Stutzman, P.,
"Virtual Cement", Chapter 10.3 *in Innovations in Portland Cement Manufacturing*, J.I. Bhatty, F.M. Miller and S.H. Kosmatka, eds., Portland Cement Association, pp.
1311-1331, 2004. (PDF Version)

Sims, J. S., Martys, N., "Simulation of Sheared Suspensions With a Parallel
Implementation of QDPD", Journal of Research of the National Institute of
Standards and Technology, **109** (2), March-April, (2004).

Hagedorn, J.G., Martys, N.S. and Douglas, J.F.,
Breakup of a fluid
thread in a confined geometry: droplet-plug transition, perturbation sensitivity,
and kinetic stabilization with confinement," Physical Review E, **69** (5),
article no. 056312, May (2004).

Flatt, R.J., Martys, N. and Bergstrom, L.,
The Rheology
of Cementitious Materials," MRS Bulletin, Materials Research Society, Vol. 29 **5**, pp. 314-318 (2004).

Son, Y., Martys, N.S., Hagedorn, J.G. and Migler, K.B.,
Suppression of Capillary Instability of a Polymeric Thread via Parallel Plate
Confinement," Macromolecules **36** (15), 5825-5833 (2003).
(PDF
Version)

Ferraris, C.F. and Martys, N.S., "Relating Fresh Concrete Viscosity Measurements from Different Rheometers," Journal of Research of the National Institute of Standards and Technology, Vol. 108, No. 3, pp. 229-234, May-June, 2003. (PDF Version)

"Simulation of SCC Flow," First North American Conference on the Design and Use of Self-Consolidating Concrete. Proceedings. Chicago, IL, November 12-13, 2002, pp. 27-30 (2003). (PDF Version)Martys, N.S. and Hagedorn, J.G.,
"Multiscale modeling of fluid transport in
heterogeneous materials using discrete Boltzmann methods," Materials and
Structures **35**, 650-659 (2002).
(PDF Version)

Sims, J.S., George, W.L., Satterfield, S.G, Hung, H.K., Hagedorn, J.G., Ketcham, P.M., Griffin, T.J., Hagstrom, S.A., Franiatte, J.C., Bryant, G.W., Jaskolski, W., Martys, N.S., Bouldin, C.E., Simmons, V., Nicolas, P., Warren, J.A., am Ende, B.A., Koontz, J.E., Filla, B.J., Pourprix, V.G., Copley, S.R., Bohn, R.B., Peskin, A.P., Parker, Y.M. and Devaney, J.E., "Accelerating Scientific Discovery Through Computation and Visualization II," Journal of Research of the National Institute of Standards and Technology, Vol. 107, No. 3, pp. 223-245 (2002). (PDF Version).

Ferraris, C.F., de Larrard, F., and Martys, N.S., "Fresh Concrete Rheology: Recent Developments," Materials Science of Concrete VI, American Ceramic Society, S. Mindess and J. Skalny, eds., 215-241 (2001). (PDF Version)

Ferraris, C.F. and Martys, N.S., "De la pâte de ciment au béton: modélisation et mesures expérimentales des propriétés rhéologiques," Rhéologie - Génie Civil et Environment. Proceedings. 36éme Colloque du Groupe Français de Rhéologie, Marne la Vallée, October 10-12, pp. 226-230 (2001). (PDF Version)Garboczi, E.J., Martys, N.S., "Acquiring, Analyzing and Using Complete Three-Dimensional Aggregate Shape Information," proceedings of the 9th Annual Symposium of the International Center for Aggregate Research, April 22-25, 2001, Austin, Texas, (2001) (PDF Version).

Martys, N.S., "A *Classical* Kinetic Theory Approach to Lattice
Boltzmann Simulation," Int. J. Mod. Phys. C., **12** (8), 1169-1178
(2001)
(PDF Version) .

Martys, N.S., Hagedorn, J.G., Devaney, J.E., "Pore Scale Modeling of Fluid Transport Using Discrete Boltzmann Methods," Proceedings. Materials Science of Concrete Special Volume: Ion and Mass Transport in Cement-Based Materials, Toronto, Canada, 1999, pp. 239-252 (2001). (PDF Version)

Martys, N.S., "Improved approximation of the Brinkman equation using a lattice Boltzmann method," Physics of Fluids, Vol. 13, No. 6, 1807-1810, (2001) (PDF Version).

Martys, N.S., Douglas, J.F., "Critical properties and phase separation in lattice Boltzmann fluid mixtures," Physical Review E, Vol. 63, pp. 1-18 (2001). (PDF Version)

Sims, J.S., Hagedorn, J.G., Ketcham, P.M., Satterfield, S.G., Griffin, T.J., George, W.L., Fowler, H.A., am Ende, B.A., Hung, H.K. Bohn, R.B., Koontz, J.E., Martys, N.S., Bouldin, C.E., Warren, J.A., Feder, D.L., Clark, C.W., Filla, B.J., Devaney, J.E., "Accelerating Scientific Discovery Through Computation and Visualization," Journal of Research of the National Institute of Standards and Technology, Vol. 105, No. 6, pp. 875-894 (2000). (PDF Version).

Bentz, D.P., Quenard, D.A., Kunzel, H.M., Baruchel, J., Peyrin, F., Martys, N.S., Garboczi, E.J., "Microstructure and transport properties of porous building materials. II: Three-dimensional X-ray tomographic studies," Materials and Structures, Vol. 33, No. 227, pp. 147-153, (2000). (PDF Version)

Masad, E., Muhunthan, B., Martys, N., "Simulation of fluid flow and permeability in cohensionless soils," Water Resources Research, Vol. 36, No. 4, pp. 851-864, (2000). (PDF Version)

Garboczi, E.J., Bentz, D.P., Martys, N.S., "Digital Images and Computer Modelling," in Experimental Methods for Porous Media, edited by P-z Wong, Academic Press, New York (1999). (PDF Version)

Martys, N.S.,
"Diffusion in Partially-Saturated Porous Materials," Materials and
Structures, **32**, pp 555-562 (1999).
(PDF Version)

Martys, N.S., "Energy Conserving Discrete Boltzmann Equation for Nonideal Systems," International Journal of Modern Physics C, Vol. 10, No. 7, pp 1367-1382 (1999). (PDF Version)

Martys, N.S., Hagedorn, J.G., Goujon, D., Devaney, J.E., Large Scale Simulations of Single and Multi-Component Flow in Porous Media," Proceedings of the SPIE - International Society for Optical Engineering, Denver, CO, July 22-23, 1999, pp. 205-213 (1999).

Martys, N.S., Douglas, J.F., "Mean-Field-Scaling in Lattice Boltzmann Fluid Mixtures," ASCE Engineering Mechanics Division Conference, 13th Proceedings, American Society of Civil Engineers (ASCE), June 13-16, 1999, pp 1-6 (1999). (PDF Version)

Martys, N.S., Mountain, R.D., "Velocity Verlet algorithm for dissipative-particle-dynamics-based models of suspensions," Physical Review E, Vol. 59, No. 3 (1999). (PDF Version)

Martys, N.S., Shan, X., Chen, H., "Evaluation of the External Force Term in the Discrete Boltzmann Equation," Physical Review E., Vol. 58. No. 5, pp 6855-6857, Nov. (1998). (PDF Version)

Vahala, G., Pavlo, P., Vahala, L., Martys, N.S., "Thermal Lattice-Boltzmann Models (TLBM) for Compressible Flows," Discrete Simulation of Fluids, Proceedings of the 7th International Conference, Oxford, England, July 14-18 (1998). (PDF Version)

Quenard, D.A., Xu. K., Kunzel, H.M. Bentz, D.P., Martys, N.S., Microstructure and Transport Properties of Porous Building Materials," Materials and Structures, Vol. 31, p 317-324, (1998). (PDF Version)

Martys, N.S., Ferraris, C.F., Capillary Transport in Mortars and Concrete," Cement and Concrete Research, Vol. 27, No. 5, pp 747-760 (1997). (PDF Version)

Bentz, D.P., Garboczi, E.J., Martys, N.S., "Application of Digital-Image-Based Models to Microstructure, Transport Properties, and Degradation of Cement-Based Materials," in Modelling of Microstructure and Its Potential for Studying Transport Properties and Durability. Kluwer Academic Publishers, Jenning, H., Ed., pp. 167-185 (1996). (PDF Version)

Martys, N.S., NIST Tutorial/Workshop on Lattice Gas and Boltzmann Methods, Gaithersburg, MD, August 21-23, 1995. Conference Report, Journal of the National Institute of Standards and Technology, Vol. 101, No. 5, pp 705-706, Sept./Oct. (1996). (PDF Version)

Lebon, L., Oger, L. Leblond, J., Hulin, J.P., Martys, N.S., Schwartz, L.M., "Pulsed Gradient NMR Measurements and Numerical Simulation of Flow Velocity Distribution in Sphere Packings," Physics of Fluids, Vol. 8, No. 2, pp 293-301, (1996). (PDF Version)

Martys, N.S., Chen, H., "Simulation of Multicomponent Fluids in Complex Three-Dimensional Geometries by the Lattice Boltzmann Method," Physical Review E, Vol. 53, No. 1, pp 743-750, (1996). (PDF Version)

Auzerais, F.M., Dunsmuir, J., Ferreol, B.B., Martys, N.S., Olson, J., Ramakrishnan, T.S., Rothman, D.H., Schwartz, L.M., "Transport in Sandstone: A Study Based on Three Dimensional Microtomography," Geophysical Research Letters, Vol 23, No. 7, pp. 705-708, (1996). (PDF Version)

Martys, N.S., Numerical Simulation of Hydrodynamic Dispersion in Random Porous Media,", Journal of Chromatography A, Vol. 707, pp 35-43 (1995). (PDF Version)

Martys, N.S., Survey of Concrete Transport Properties and Their Measurement," National Institute of Standards and Technology Internal Report 5592 (1995). (PDF Version)

Bentz, D.P., Martys, N.S., Stutzman, P., Garboczi, E.J., Levenson, M.S., Dunsmuir, J., Schwartz, L.M., X-Ray Microtomography of an ASTM C-109 mortar exposed to sulfate attack," in Microstructure of Cement-Based Systems/Bondingand Interfaces in Cementitious Materials, Vol. 370, Ed. S. Diamond et al., Materials Research Society, Pittsburgh, pp. 77-82 (1995). (PDF Version)

Martys, N.S., "Fractal Growth in Hydrodynamic Dispersion Through Random Porous Media," Physical Review E, Vol. 50, No. 1, pp 335-342, (1994). (PDF Version)

Martys, N.S., Torquato, S., Bentz, D.P., "Universal Scaling of Fluid Permeability for Sphere Packings," Physical Review E, Vol. 50, No. 1, pp 403-408 (1994). (PDF Version)

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