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TECHNICAL PAPERS

Three-dimensional Hybrid Continuum-Atomistic Simulations For Multiscale Hydrodynamics

[+] Author and Article Information
H. S. Wijesinghe, N. G. Hadjiconstantinou

Massachusetts Institute of Technology, Cambridge, MA

R. D. Hornung

Lawrence Livermore National Laboratory, Livermore, CA

A. L. Garcia

San Jose State University, San Jose, CA

J. Fluids Eng 126(5), 768-777 (Dec 07, 2004) (10 pages) doi:10.1115/1.1792275 History: Received August 21, 2003; Revised March 29, 2004; Online December 07, 2004
Copyright © 2004 by ASME
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Figures

Grahic Jump Location
Outline of AMAR hybrid: (a) Beginning of a time step; (b) advance the continuum grid; (c) create buffer particles; (d) advance DSMC particles; (e) refluxing; (f ) reset overlying continuum grid.
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Multiple DSMC regions are coupled by copying particles from one DSMC region (upper left) to the buffer region of an adjacent DSMC region (lower right). After copying, regions are integrated independently over the same time increment.
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3D AMAR computational domain for investigation of tolerance parameter variation with number of particles in DSMC cells
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Variation of density gradient tolerance with number of DSMC particles N. Here we use N because in our implementation Ncell=N.
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Average density for stationary fluid Euler-DSMC hybrid simulation with Ncell=80. Error bars give one standard deviation over 10 samples.
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Computational domain for uniform field test
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Particle increase in the DSMC domain resulting from net heat flux transfer from the DSMC to the Euler region
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Computational domain for self-diffusion interface tracked adaptively. The borders of DSMC patches are indicated by the boxes near the middle of the domain. The Euler model is applied in the remainder of the domain.
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Comparison of profiles obtained simulating diffusion with AMAR with theoretical diffusion profiles. Both self-diffusion and two-species diffusion are shown. Note λ refers to the Ar-Ar mean free path. The mean collision time τm is also associated with the Ar-Ar system.
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Argon gas density profile evolution to equilibrium. τm is the mean collision time.
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Equilibrium shock wave profiles for density, temperature and velocity in a stationary Argon shock. The solid line connects the Rankine-Hugoniot jump values through a sharp jump centered on the AMAR shock location as determined by the AMAR density profile. The solid-square line is the AMAR result. Note that the AMAR temperature jump “leads” the AMAR density jump as documented in Ref. 29. The agreement between AMAR and Rankine-Hugoniot jump values is excellent.
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Comparison of He-Xe binary gas shock wave equilibrium profiles computed with AMAR (blue lines) and with DSMC alone (red lines). The mixture mean free path λ=0.46 mm for this test.
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A moving Mach 5 shock wave though Argon. The AMAR algorithm tracks the shock by adaptively moving the DSMC region with the shock front.
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A moving Mach 5 shock wave though Argon. The AMAR profile (red dots) is compared with the analytical time evolution of the initial discontinuity (blue lines). τm is the mean collision time.
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Computational domain for Richtmyer-Meshkov instability simulation
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Richtmyer-Meshkov instability simulation, time t=1.3τm where τm is the Argon-Argon mean collision time. The shock wave is ahead of the gas-gas interface.
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Richtmyer-Meshkov instability simulation, time t=26.0τm where τm is the Argon-Argon mean collision time. The shock wave intercepts the gas-gas interface.
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Richtmyer-Meshkov instability simulation, time t=170.1τm where τm is the Argon-Argon mean collision time. The shock wave has passed the gas-gas interface.

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