[Oral Presentation]考虑剪胀效应的颗粒动力学模型

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

考虑剪胀效应的颗粒动力学模型

ID：321 Submission ID：210 View Protection：ATTENDEE Updated Time：2024-05-20 10:45:18 Hits：801 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

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

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Abstract

在自然地质灾害和工业生产研究领域，颗粒动力学模型十分重要。本研究采用连续介质理论，以可压缩Navier-Stokes方程为基础，针对水下颗粒的流体环境，构建了颗粒-流体两相动力学模型。该模型采用饱和颗粒μ(J)流变准则，引入土的剪胀（缩）理论阐释颗粒在受剪过程中体积的变化，从而更深入地刻画了颗粒运动的机制。
为验证模型的有效性，本研究通过构建数值模型，搭建了水下颗粒垮塌模型，将模拟结果、实验数据及其他研究结果进行比较，发现加入剪胀（缩）效应能显著延迟水下颗粒流的滑动，从而提升模型的精度。计算表明，剪胀效应越显著、颗粒黏度越大，崩塌过程更延迟。开展敏感性分析评估了初始摩擦强度和初始堆积密度等参数对崩塌过程的影响。
综上所述，本研究提出的颗粒-流体两相动力学模型展现出了良好的应用效果，证实了颗粒本构关系与流体动力学方法相结合搭建颗粒-流体两相动力学的有效性。该两相动力学模型对于颗粒沉积过程的刻画和地质灾害分析具有重要意义。

Keywords

颗粒材料,流变学,计算流体力学,剪胀

Speaker

刘志昊

深圳大学土木与交通工程学院

Submission Author

刘志昊深圳大学土木与交通工程学院

建波费深圳大学

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