[Oral Presentation]基于不均匀粒径分布的二元颗粒柱坍塌离散元模拟

Organized By

Hohai University

Monash University

Co-organized by

Southeast University

Jiangxi University of Science and Technology

Northeast University

DUT-BSU Scientific Research and Innovation Center

Suzhou University of Science and Technology

State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment

Sponsoring agency

KELI SDEM Software (Dalian) Co., Ltd.

Sugon Smart Computing Information Technology Co., Ltd.

Beijing Paratera Technology Co., Ltd.

Simpop Information Technology Co., Ltd.

Important Dates

Conference Announcement

December 2023, release First Round Announcement
Abstract Submission Deadline
March 31^th, 2024
Paper Submission Deadline
April 30^th, 2024
Registration
From January 1^st, 2024
Conference Schedule
May 31^st (Friday), 2024 On-Site Registration
June 1^st to 3^rd, 2024 Conference

基于不均匀粒径分布的二元颗粒柱坍塌离散元模拟

ID：204 Submission ID：341 View Protection：ATTENDEE Updated Time：2024-04-30 10:27:59 Hits：577 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

Session：[No Session] » [No Session Block]

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Abstract

粒径和级配是影响碎屑颗粒流运动的重要因素。利用三维离散元模型，从宏细观探究考虑非均匀粒度分布的二元颗粒柱坍塌特性在此基础上，引入颗粒温度的概念并利用聚类分析方法探究基于非均匀粒径分布的二元颗粒柱流动机理。研究结果表明：(1) 当粗颗粒含量高于20%时，颗粒柱的归一化堆积高度随粗颗粒含量和粗细颗粒粒径比的增加而逐渐增加，而颗粒柱的归一化运移距离随粗颗粒含量和粗细颗粒粒径比的增加而逐渐减小。(2) 随着粗颗粒含量和粗细颗粒粒径比的增加，颗粒间平均接触数、平均接触力、接触力方向分布的各向异性程度以及颗粒的聚类系数均增大，颗粒间互锁作用和颗粒的聚集程度逐渐增强，导致颗粒柱的能量耗散减少，抑制颗粒柱势能转化为动能的占比，从而更显著地限制颗粒在坍塌过程中的流动性。(3) 当颗粒温度较高时，颗粒倾向于集体运动并形成团簇，表现出动力学非均质性。粗颗粒含量和粗细颗粒粒径比的增加会导致颗粒间倾向于形成更大规模的活性团簇，即更多颗粒在坍塌过程中表现出集体行为，并形成更高的抗剪切变形能力，最终在宏观角度形成更到的堆积高度和更短的运移距离。

Keywords

不均匀粒径,坍塌特性,离散元仿真,颗粒温度,聚类分析,颗粒计算力学

Speaker

贾俊泽

北京科技大学

Submission Author

孙浩北京科技大学

贾俊泽北京科技大学

Sponsored By

Hohai University

Panel of Computational Mechanics on Granular Materials, Working Party of Computational Mechanics, Chinese Society of Theoretical and Applied Mechanics

Jiangsu Society of Theoretical and Applied Mechanics