@inproceedings{4a2ea93c377e49e4956dbcd97a797ab8,
title = "Pebbles simulation of static friction and new static friction benchmark",
abstract = "Pebble bed reactors contain large numbers of spherical fuel elements arranged randomly. Determining the motion and location of these fuel elements is useful for calculating certain parameters of pebble bed reactor operation. Static friction affects both the arrangement of the pebbles and the forces they transmit. This paper documents the PEBBLES static friction model used to simulate the motion of pebbles in pebble bed reactors. The model uses a three-dimensional differential static friction approximation extended from the two-dimensional Cundall and Strack model. The derivation of determining the rotational transformation of pebble-to-pebble static friction force is provided. A new implementation for a differential rotation method for pebble-to-container static friction force has been created. Previous published methods are insufficient for pebble bed reactor geometries. A new analytical static friction benchmark is documented that can be used to verify key static friction simulation parameters. This benchmark is based on determining the exact pebble-to-pebble and pebble-to-container static friction coefficients required to maintain a stable five-sphere pyramid.",
keywords = "DEM simulation, PBR, Static friction",
author = "Cogliati, \{Joshua J.\} and Ougouag, \{Abderrafi M.\}",
year = "2010",
language = "English",
isbn = "9781617820014",
series = "International Conference on the Physics of Reactors 2010, PHYSOR 2010",
publisher = "American Nuclear Society",
pages = "1223--1235",
booktitle = "International Conference on the Physics of Reactors 2010, PHYSOR 2010",
note = "International Conference on the Physics of Reactors 2010, PHYSOR 2010 ; Conference date: 09-05-2010 Through 14-05-2010",
}