[Oral Presentation]混合粒径含沙流的壁解析大涡模拟

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

混合粒径含沙流的壁解析大涡模拟

ID：33 Submission ID：78 View Protection：ATTENDEE Updated Time：2024-04-09 22:02:55 Hits：517 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

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

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Abstract

现有的风沙流数值研究大多将沙粒简化为单一粒径的颗粒，而自然风沙流是混合粒径颗粒两相流，因此有必要对混合粒径风沙流进行模拟。在本研究中，实现了混合粒径风沙流的壁解析大涡模拟。利用拉格朗日点粒子模型对风场中的每颗沙粒进行跟踪。在考虑床面侵蚀的前提下，研究了混合粒径含沙流中沙粒的输运特性。考虑到沙-床碰撞对模拟的重要影响，本次模拟根据以往的实验结果对击溅函数进行了修改。结果表明，在混合粒径含沙流中，所有跃移沙粒中反弹沙粒的比例约为 0.6，是溅起沙粒的两倍，沙粒反弹角的修正对混合粒径含沙流的模拟结果影响很大。修正击溅函数的混合粒径两相流模拟结果显示，跃移沙粒的平均粒径随高度的增加而减小，且跃移层顶部的平均粒径比沙床附近的低约 20%。将沙粒按照大小分组并进一步分析发现，随着高度的增加，小沙粒的输沙强度下降更快。在高度y/δ = 0.05和y/δ = 0.1时，小沙粒的体积分数和输沙强度超过中等沙粒和大沙粒。

Keywords

壁解析大涡模拟,混合粒径颗粒,击溅函数,沙粒输运

Speaker

雷俊清

兰州大学

Submission Author

雷俊清兰州大学

王国华兰州大学

郑晓静兰州大学土木工程与力学学院力学与工程科学系

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