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Title: An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFD-DEM Simulations

Abstract

Coupled Computational Fluid Dynamics(CFD) - Discrete Element Method (DEM) models provide an accurate description of multiphase physical systems where a granular phase exists in an underlying continuous medium. The time integration of the granular phase in these simulations are typically handled using an explicit time integration scheme with a global time step that is much smaller than fluid time scales, in order to resolve inter-particle collisions. An adapative time integration technique that avoids this global constraint for the granular phase is presented in this work. The algorithm involves the use of a local time stepping approach to resolve collisional time scales for only a subset of particles that are in close proximity to potential collision partners, thereby resulting in substantial reduction of computational cost. This approach is observed to be 2-3X faster than traditional explicit methods for problems that involve both dense and dilute regions, while maintaining the same level of accuracy.

Authors:
 [1];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1467094
Report Number(s):
NREL/CP-2C00-71534
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the 48th AIAA Fluid Dynamics Conference, 25-29 June 2018, Atlanta, Georgia
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; computational fluid dynamics; discrete element methods; fluidization

Citation Formats

Sitaraman, Hariswaran, and Grout, Ray W. An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFD-DEM Simulations. United States: N. p., 2018. Web. doi:10.2514/6.2018-3715.
Sitaraman, Hariswaran, & Grout, Ray W. An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFD-DEM Simulations. United States. doi:10.2514/6.2018-3715.
Sitaraman, Hariswaran, and Grout, Ray W. Fri . "An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFD-DEM Simulations". United States. doi:10.2514/6.2018-3715.
@article{osti_1467094,
title = {An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFD-DEM Simulations},
author = {Sitaraman, Hariswaran and Grout, Ray W},
abstractNote = {Coupled Computational Fluid Dynamics(CFD) - Discrete Element Method (DEM) models provide an accurate description of multiphase physical systems where a granular phase exists in an underlying continuous medium. The time integration of the granular phase in these simulations are typically handled using an explicit time integration scheme with a global time step that is much smaller than fluid time scales, in order to resolve inter-particle collisions. An adapative time integration technique that avoids this global constraint for the granular phase is presented in this work. The algorithm involves the use of a local time stepping approach to resolve collisional time scales for only a subset of particles that are in close proximity to potential collision partners, thereby resulting in substantial reduction of computational cost. This approach is observed to be 2-3X faster than traditional explicit methods for problems that involve both dense and dilute regions, while maintaining the same level of accuracy.},
doi = {10.2514/6.2018-3715},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {6}
}

Conference:
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