An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFDDEM 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 interparticle 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 23X faster than traditional explicit methods for problems that involve both dense and dilute regions, while maintaining the same level of accuracy.
 Authors:

 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/CP2C0071534
 DOE Contract Number:
 AC3608GO28308
 Resource Type:
 Conference
 Resource Relation:
 Conference: Presented at the 48th AIAA Fluid Dynamics Conference, 2529 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 CFDDEM Simulations. United States: N. p., 2018.
Web. doi:10.2514/6.20183715.
Sitaraman, Hariswaran, & Grout, Ray W. An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFDDEM Simulations. United States. doi:10.2514/6.20183715.
Sitaraman, Hariswaran, and Grout, Ray W. Fri .
"An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFDDEM Simulations". United States. doi:10.2514/6.20183715.
@article{osti_1467094,
title = {An Adaptive Timestepping Algorithm for Particle Time Integration in Coupled CFDDEM 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 interparticle 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 23X faster than traditional explicit methods for problems that involve both dense and dilute regions, while maintaining the same level of accuracy.},
doi = {10.2514/6.20183715},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {6}
}
Works referenced in this record:
CFD modeling of gas–solid flow and cracking reaction in twostage riser FCC reactors
journal, September 2009
 Lan, Xingying; Xu, Chunming; Wang, Gang
 Chemical Engineering Science, Vol. 64, Issue 17
Computer "Experiments" on Classical Fluids. I. Thermodynamical Properties of LennardJones Molecules
journal, July 1967
 Verlet, Loup
 Physical Review, Vol. 159, Issue 1
Sur une courbe, qui remplit toute une aire plane
journal, March 1890
 Peano, G.
 Mathematische Annalen, Vol. 36, Issue 1
Grain flow as a fluidmechanical phenomenon
journal, September 1983
 Haff, P. K.
 Journal of Fluid Mechanics, Vol. 134, Issue 1
A Partitioning Strategy for Nonuniform Problems on Multiprocessors
journal, May 1987
 Berger,
 IEEE Transactions on Computers, Vol. C36, Issue 5
Drag force of intermediate Reynolds number flow past mono and bidisperse arrays of spheres
journal, January 2007
 Beetstra, R.; van der Hoef, M. A.; Kuipers, J. A. M.
 AIChE Journal, Vol. 53, Issue 2
Experimental segregation profiles in bubbling gasfluidized beds
journal, November 2007
 Joseph, Gustavo G.; Leboreiro, José; Hrenya, Christine M.
 AIChE Journal, Vol. 53, Issue 11
Discrete particle simulation of twodimensional fluidized bed
journal, October 1993
 Tsuji, Y.; Kawaguchi, T.; Tanaka, T.
 Powder Technology, Vol. 77, Issue 1
Selection of an appropriate time integration scheme for the discrete element method (DEM)
journal, October 2008
 KruggelEmden, H.; Sturm, M.; Wirtz, S.
 Computers & Chemical Engineering, Vol. 32, Issue 10
Stackless KDTree Traversal for High Performance GPU Ray Tracing
journal, September 2007
 Popov, Stefan; Günther, Johannes; Seidel, HansPeter
 Computer Graphics Forum, Vol. 26, Issue 3
Gassolids flow behavior: CFB riser vs. downer
journal, September 2001
 Zhang, H.; Huang, W. X.; Zhu, J. X.
 AIChE Journal, Vol. 47, Issue 9
On the History of the Minimum Spanning Tree Problem
journal, January 1985
 Graham, R. L.; Hell, Pavol
 IEEE Annals of the History of Computing, Vol. 7, Issue 1
Applying the direct quadrature method of moments to improve multiphase FCC riser reactor simulation
journal, December 2012
 Dutta, Abhishek; Constales, Denis; Heynderickx, Geraldine J.
 Chemical Engineering Science, Vol. 83
Cluster patterns in circulating fluidized beds predicted by numerical simulation (discrete particle model versus twofluid model)
journal, March 1998
 Tsuji, Y.; Tanaka, T.; Yonemura, S.
 Powder Technology, Vol. 95, Issue 3
Numerical investigation and modeling of reacting gassolid flows in the presence of clusters
journal, January 2015
 Capecelatro, Jesse; Pepiot, Perrine; Desjardins, Olivier
 Chemical Engineering Science, Vol. 122
Trends in Multiphase Modeling and Simulation of Sprays
journal, December 2014
 Kolakaluri, Ravi; Subramaniam, Shankar; Panchagnula, Mahesh V.
 International Journal of Spray and Combustion Dynamics, Vol. 6, Issue 4
Castro: a new Compressible Astrophysical Solver. i. Hydrodynamics and SelfGravity
journal, May 2010
 Almgren, A. S.; Beckner, V. E.; Bell, J. B.
 The Astrophysical Journal, Vol. 715, Issue 2