Particle-scale computational approaches to model dry and saturated granular flows of non-Brownian, non-cohesive, and non-spherical rigid bodies

Wachs, Anthony

doi:10.1007/s00707-019-02389-9

Cited by 38 publications

(13 citation statements)

References 270 publications

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“…At the outset, the reader is pointed to the extensive review by Wachs (2019) on numerical techniques used for immersed non-spherical rigid bodies subject to various fluid environments. The methods used for GISS are similar to those mentioned in the references therein.…”

Section: Dns Using Gissmentioning

confidence: 99%

Chaotic orbits of tumbling ellipsoids

et al. 2020

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Section: Dns Using Gissmentioning

confidence: 99%

Chaotic orbits of tumbling ellipsoids

et al. 2020

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“…With the increasing performance of today's computer hardware and supercomputers, simulations of particulate flows are becoming an increasingly popular tool for engineers to investigate and predict the rich dynamics of such systems. Depending on the usage of a macroscopic or microscopic description of the system [1,2], the available simulation approaches differ substantially in terms of accuracy and computational cost. Among them, the class of Direct Numerical Simulations (DNS) provides unique access to detailed force information of single grains or flow measurements inside small pores [2].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the usage of a macroscopic or microscopic description of the system [1,2], the available simulation approaches differ substantially in terms of accuracy and computational cost. Among them, the class of Direct Numerical Simulations (DNS) provides unique access to detailed force information of single grains or flow measurements inside small pores [2]. This is achieved by fully resolving all flow features and particle shapes.…”

Section: Introductionmentioning

confidence: 99%

A coupled lattice Boltzmann method and discrete element method for discrete particle simulations of particulate flows

Rettinger

Rüde

2018

Computers & Fluids

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A B S T R A C TA four-way coupling scheme for the direct numerical simulation of particleladen flows is developed and analyzed. It employs a novel adaptive multirelaxation time lattice Boltzmann method to simulate the fluid phase efficiently. The momentum exchange method is used to couple the fluid and the particulate phase. The particle interactions in normal and tangential direction are accounted for by a discrete element method using linear contact forces. All parameters of the scheme are studied and evaluated in detail and precise guidelines for their choice are developed. The development is based on several carefully selected calibration and validation tests of increasing physical complexity. It is found that a well-calibrated lubrication model is crucial to obtain the correct trajectories of a sphere colliding with a plane wall in a viscous fluid. For adequately resolving the collision dynamics it is found that the collision time must be stretched appropriately. The complete set of tests establishes a validation pipeline that can be universally applied to other fluidparticle coupling schemes providing a systematic methodology that can guide future developments.

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“…These considerations of particle-particle interactions can be further extended to particles of arbitrary shape, where multiple contact points per collision can occur, which would further complicate the picture [161]. Similar considerations should hold for the fluid drag on more irregular particle shapes as described, e.g., by [145] or the considerations of clay platelets discussed in Sect.…”

Section: Non-spherical Particlesmentioning

confidence: 95%

Incorporating grain-scale processes in macroscopic sediment transport models

Vowinckel¹

2021

Acta Mech

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Sediment transport simulations face the challenge of accounting for vastly different scales in space and time that cannot be tackled by a unifying approach. Instead, processes are subdivided into a microscale at the particle level, a mesoscale of a large finite number of particles, and a macroscale that computes the sediment motion by means of advection–diffusion equations. The different processes occurring at different scales are simulated using different computational approaches. However, modeling sediment transport at multiple scales with high fidelity requires proper closure arguments that interconnect the different processes. Ultimately, we will need efficient macroscale models that can readily be utilized for engineering practices covering, e.g., entire river reaches or even estuaries. In recent years, highly resolved simulations have become a valuable tool to provide these closure arguments for sediment transport models on the continuum scale. In this paper, we will review the most relevant approaches to simulate sediment transport at different scales and discuss the perspectives of four most promising modeling techniques that can help to improve sediment transport modeling. On the grain scale, these enhancements include the impact of mechanical properties of cohesion and biocohesion as well as the shape of non-spherical sediment grains on fluid–particle and particle–particle interactions. On larger scales, we review constitutive equations for the macroscopic rheological behavior of sediment beds that may decouple the relevant scales for fluid and sediment motion. Furthermore, we discuss machine learning strategies as an efficient means to derive scaling arguments across multiple scales.

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Particle-scale computational approaches to model dry and saturated granular flows of non-Brownian, non-cohesive, and non-spherical rigid bodies

Cited by 38 publications

References 270 publications

Chaotic orbits of tumbling ellipsoids

Chaotic orbits of tumbling ellipsoids

A coupled lattice Boltzmann method and discrete element method for discrete particle simulations of particulate flows

Incorporating grain-scale processes in macroscopic sediment transport models

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