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Title: A Multiscale Schwarz Coupling for Capturing Boundary Effects in Dilute Charged Particle Systems.

Abstract

Abstract not provided.

Authors:
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1369513
Report Number(s):
SAND2016-6404C
643957
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the SIAM Annual 2016 held July 11-15, 2016 in Boston, MA, United States.
Country of Publication:
United States
Language:
English

Citation Formats

Cheung, James. A Multiscale Schwarz Coupling for Capturing Boundary Effects in Dilute Charged Particle Systems.. United States: N. p., 2016. Web.
Cheung, James. A Multiscale Schwarz Coupling for Capturing Boundary Effects in Dilute Charged Particle Systems.. United States.
Cheung, James. 2016. "A Multiscale Schwarz Coupling for Capturing Boundary Effects in Dilute Charged Particle Systems.". United States. doi:. https://www.osti.gov/servlets/purl/1369513.
@article{osti_1369513,
title = {A Multiscale Schwarz Coupling for Capturing Boundary Effects in Dilute Charged Particle Systems.},
author = {Cheung, James},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 7
}

Conference:
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  • A general analysis of gas-particle flows, under the hypotheses of number of particles large enough to consider the solid phase as a continuum and of volume fraction small enough to consider the suspension as dilute, is presented. The Stokes number Sk and the particle loading ratio ..beta.. are shown to be the basic parameters governing the flow. Depending on the values of these two parameters, in one case the reciprocal interaction of the fluid and solid phases must be considered (two-way coupling), in the second case only the effect of the fluid field on the particle motion is relevant (one-waymore » coupling). In the more general case of two-way coupling, the flow is governed by two sets of Navier-Stokes equations, one for each phase, which are coupled together through the particle volume fraction and the momentum interchange forces. The two systems of equations, expressed in the variables velocity, pressure, and particle volume fraction, are solved numerically by a finite difference scheme. The model has been applied to a duct with a sudden restriction, simulating a flow metering device. The coupling effect both on fluid and solid phase fields, the increase of pressure drop, and the energy dissipated in the fluid-solid interaction have been determined as functions of the governing parameters, Sk and ..beta... The parametric study also indicates the ranges of ..beta.. and Sk in which simplified formulations may be assumed.« less
  • A general analysis of gas-particle flows is presented using the hypotheses of a number of particles large enough to consider the solid phase as a continuum and of a volume fraction small enough to consider the suspension as dilute. It is found that the Stokes number (Sk) and the particle loading ratio (beta) are the basic parameters governing the flow. For small values of beta and large values of Sk it is possible to disregard the effect of the particles on the fluid field and simple numerical models based on one-way coupling may be used. However, for larger values ofmore » beta and lower Sk, both the fluid and the solid phase flow fields (and as a consequence the overall quantities such as pressure drop and energy dissipation) are determined to be substantially affected by the interphase coupling. A computational model accounting for two-way coupling is presented and found to provide for an accurate simulation. In addition, correlations are developed for determining the pressure drop which increases as a function of beta and Sk, and it is suggested that these correlations may be of practical interest for the investigation of flow metering systems.« less
  • Multiphysics and multiscale simulation systems are emerging as a new grand challenge in computational science, largely because of increased computing power provided by the distributed-memory parallel programming model on commodity clusters. These systems often present a parallel coupling problem in their intercomponent data exchanges. Another potential problem in these coupled systems is language interoperability between their various constituent codes. In anticipation of combined parallel coupling/language interoperability challenges, we have created a set of interlanguage bindings for a successful parallel coupling library, the Model Coupling Toolkit. We describe the method used for automatically generating the bindings using the Babel language interoperabilitymore » tool, and illustrate with short examples how MCT can be used from the C++ and Python languages. We report preliminary performance reports for the MCT interpolation benchmark. We conclude with a discussion of the significance of this work to the rapid prototyping of large parallel coupled systems.« less
  • Abstract not provided.
  • Abstract not provided.