Probabilistic calibration of discrete element simulations using the sequential quasi-Monte Carlo filter

Hongyang Cheng, Takayuki Shuku, Klaus Thoeni, Haruyuki Yamamoto

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The calibration of discrete element method (DEM) simulations is typically accomplished in a trial-and-error manner. It generally lacks objectivity and is filled with uncertainties. To deal with these issues, the sequential quasi-Monte Carlo (SQMC) filter is employed as a novel approach to calibrating the DEM models of granular materials. Within the sequential Bayesian framework, the posterior probability density functions (PDFs) of micromechanical parameters, conditioned to the experimentally obtained stress–strain behavior of granular soils, are approximated by independent model trajectories. In this work, two different contact laws are employed in DEM simulations and a granular soil specimen is modeled as polydisperse packing using various numbers of spherical grains. Knowing the evolution of physical states of the material, the proposed probabilistic calibration method can recursively update the posterior PDFs in a five-dimensional parameter space based on the Bayes’ rule. Both the identified parameters and posterior PDFs are analyzed to understand the effect of grain configuration and loading conditions. Numerical predictions using parameter sets with the highest posterior probabilities agree well with the experimental results. The advantage of the SQMC filter lies in the estimation of posterior PDFs, from which the robustness of the selected contact laws, the uncertainties of the micromechanical parameters and their interactions are all analyzed. The micro–macro correlations, which are byproducts of the probabilistic calibration, are extracted to provide insights into the multiscale mechanics of dense granular materials.

Original languageEnglish
Article number11
JournalGranular Matter
Volume20
Issue number1
DOIs
Publication statusPublished - Feb 1 2018

Fingerprint

Probability density function
probability density functions
Finite difference method
Calibration
filters
Granular materials
granular materials
simulation
soils
Soils
Byproducts
calibrating
Mechanics
Trajectories
trajectories
configurations
predictions
Uncertainty
interactions

Keywords

  • Calibration
  • Data assimilation
  • Discrete element method
  • Sequential Monte Carlo
  • Triaxial compression

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)

Cite this

Probabilistic calibration of discrete element simulations using the sequential quasi-Monte Carlo filter. / Cheng, Hongyang; Shuku, Takayuki; Thoeni, Klaus; Yamamoto, Haruyuki.

In: Granular Matter, Vol. 20, No. 1, 11, 01.02.2018.

Research output: Contribution to journalArticle

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