International Journal for Multiscale Computational Engineering

ISSN for PRINT: 1543-1649

For Online Access

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2004, Volume2

Issue 2

157 pages

DOI: 10.1615/IntJMultCompEng.v2.i2

Issue price - $178.00

Hettithanthrige S. Wijesinghe
Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139

Nicolas G. Hadjiconstantinou
Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139

We discuss hybrid atomistic-continuum methods for multiscale hydrodynamic applications. Both dense-fluid and dilute-gas formulations are considered. The choice of coupling method and its relation to the fluid physics as well as the need for timescale decoupling is highlighted. In particular, by relating the molecular integration timestep to the CFL timestep, we show that compressibility is important in determining the choice of a coupling method. Appropriate coupling techniques for various flow regimes are discussed and proposed. We also discuss recently developed incompressible and compressible hybrid methods for dilute gases. The incompressible framework is based on the Schwarz alternating method, which provides timescale decoupling; the compressible method is a multispecies, fully adaptive mesh and algorithm refinement approach that introduces the direct-simulation Monte Carlo at the finest level of mesh refinement.

DOI: 10.1615/IntJMultCompEng.v2.i2.20 Download article, 15 pages

Article price - $35.00

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