HOSS: an implementation of the combined finite-discrete element method
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HOSS: an implementation of the combined finite‑discrete element method Earl E. Knight1 · Esteban Rougier1 · Zhou Lei1 · Bryan Euser1 · Viet Chau1 · Samuel H. Boyce1 · Ke Gao1 · Kurama Okubo2 · Marouchka Froment1 Received: 23 January 2020 / Revised: 27 May 2020 / Accepted: 13 July 2020 © The Author(s) 2020
Abstract Nearly thirty years since its inception, the combined finite-discrete element method (FDEM) has made remarkable strides in becoming a mainstream analysis tool within the field of Computational Mechanics. FDEM was developed to effectively “bridge the gap” between two disparate Computational Mechanics approaches known as the finite and discrete element methods. At Los Alamos National Laboratory (LANL) researchers developed the Hybrid Optimization Software Suite (HOSS) as a hybrid multi-physics platform, based on FDEM, for the simulation of solid material behavior complemented with the latest technological enhancements for full fluid–solid interaction. In HOSS, several newly developed FDEM algorithms have been implemented that yield more accurate material deformation formulations, inter-particle interaction solvers, and fracture and fragmentation solutions. In addition, an explicit computational fluid dynamics solver and a novel fluid–solid interaction algorithms have been fully integrated (as opposed to coupled) into the HOSS’ solid mechanical solver, allowing for the study of an even wider range of problems. Advancements such as this are leading HOSS to become a tool of choice for multi-physics problems. HOSS has been successfully applied by a myriad of researchers for analysis in rock mechanics, oil and gas industries, engineering application (structural, mechanical and biomedical engineering), mining, blast loading, high velocity impact, as well as seismic and acoustic analysis. This paper intends to summarize the latest development and application efforts for HOSS. Keywords Combined finite-discrete element method · Hybrid optimization software suite · Massively parallel 2D/3D multi-physics THM simulations · Large material deformation and rotation · Fluid-solid interaction · Contact, friction, fracture, and fragmentation
1 Introduction The combined finite-discrete element method (FDEM) was first conceived in 1989 by Munjiza while working at Tohoku University in Sendai, Japan. Initially FDEM was implemented only in 2D, with the first software platform being subsequently developed in 1990s at the University of Wales, Swansea and at the Massachusetts Institute of Technology (MIT). At the time, the FDEM implementation was written in C ++ and the code was called RG [1–3]. The code * Earl E. Knight [email protected] 1
Geophysics Group, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA
Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA, USA
2
was initially intended to model fracture and fragmentation of cementitious materials and therefore was designed to handle finite displacements and finite rotations while incorporating large-s
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