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You searched on: Author: nicos martys Sorted by: title

Displaying records 1 to 10 of 82 records.
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1. Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition Perturbation Sensitivity and Kinetic Stabilization with Confinement
Published: 5/26/2004
Authors: John G Hagedorn, Nicos Martys, Jack F Douglas
Abstract: The breakup of a fluid thread surrounded by another Newtonian fluid in a coaxial tube in the absence of imposed flow is investigated using the Lattice Boltzmann (LB) model. We observe a confinement-induced transition between spherical droplets to p ...

2. Study of a Dissipative Particle Dynamics Based Approach for Modeling Suspensions
Published: 4/1/2005
Author: Nicos Martys
Abstract: 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 in ...

3. Virtual Permeametry on Microtomographic Images
Published: 11/1/2004
Authors: C H Arns, M A Knackstedt, W V Pinczewski, Nicos Martys
Abstract: We show that accurate numerical micropermeametry measurements can be performed on three dimensional digitized images of sedimentary rock. The sample size can be very small making it possible to predict properties from core material not suited for l ...

4. A BBGKY-based density gradient approximation of interparticle forces: Application for discrete Boltzman methods
Published: 10/26/2005
Author: Nicos Martys
Abstract: 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, bas ...

5. A Classical Kinetic Theory Approach to Lattice Boltzmann Simulation
Published: 10/1/2001
Author: Nicos Martys
Abstract: An approach to lattice Boltzmann simulation is described, which makes a direct connection between classical kinetic theory and contemporary lattice Boltzmann modeling methods. This approach can lead to greater accuracy, improved numerical stability ...

6. A Comparison of Viscosity-Concentration Relationships for Emulsions
Published: 11/1/2008
Authors: Jeffrey W Bullard, A T Pauli, Edward Joseph Garboczi, Nicos Martys
Abstract: Differential Effective Medium Theory (D-EMT) is applied to derive expressions for the viscosity of a colloidal suspension or an emulsion as a function of the volume fraction of the dispersed phase. The application of D-EMT to this problem depends on ...

7. 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 ...

8. A Numerical Study of the Flow of Bingham-Like Fluids In Two Dimensional Vane And Cylinder Rheometers Using a Smoothed Particle Hydrodynamic (SPH) Based Method
Published: 4/7/2010
Authors: Huaning Zhu, Nicos Martys, Chiara F Ferraris, Daniel De Kee
Abstract: A vane rheometer is commonly used to determine the rheological properties of suspensions, colloids such as cement-based materials, many of which can be described as a Bingham fluid. Due to the complex flow geometry of the vane rheometer, relating mea ...

9. A Smoothed Particle Hydrodynamics Based Fluid Model with a Spatially Dependent Viscosity: Application to flow of a suspension with a non-Newtonian fluid matrix
Published: 10/1/2010
Authors: Nicos Martys, William L George, Byong-Wa Chun, Didier Lootens

10. A Stokes Permeability Solver for Three-Dimensional Porous Media
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7416
Published: 4/4/2007
Authors: Dale P Bentz, Nicos Martys
Abstract: 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 ...

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