Mechanism of fragmentation of inhomogeneous porous viscoelastic liquid in solid/fluid transition regime

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630047
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: KAMEDA Masaharu 東京農工大学, 工学(系)研究科(研究院), 教授 (70262243)
• Co-Investigator(Kenkyū-buntansha): YAMANAKA Akinori 東京農工大学, 大学院工学研究院, 准教授 (50542198)
• Co-Investigator(Renkei-kenkyūsha): ICHIHARA Mie 東京大学, 地震研究所, 准教授 (00376625) ; OKUMURA Satoshi 東北大学, 大学院理学研究科, 助教 (40532213) ; UESUGI Kentaro 高輝度光科学研究センター, 利用研究促進部門, 研究員 (80344399)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 流体工学 / 固体地球惑星物理学 / 計算力学 / 火山爆発 / 破砕 / き裂 / フェーズフィールド法

Outline of Final Research Achievements

We conducted laboratory experiment and numerical simulation for fragmentation of vesicular magma, which is a trigger of explosive eruption. We observed the fragmentation of vesicular magma analog whose three-dimensional (3D) pore structure was determined by X-ray tomography. We simulated 3D internal stress distribution of the analog by finite-element analysis (FEM). By combined analysis of experimental observation and FEM analysis, we found that the location of crack initiation is coincide with the maximum stress concentration point around the pore. We simulated crack propagation in Maxwell fluid based on a continuum approach using the phase-field method coupled with FEM. We successfully captured the difference in crack propagation in a two-dimensional plate under the different viscoelasticity.

Free Research Field

流体工学