Research

Simulation and experiment for soft matter systems

We study the mechanical properties of functional soft materials using computer simulation. Our research focuses on the rheology of complex fluids. We develop simulations to capture mesoscale dynamics and microstructures in out-of-equilibrium conditions, such as flowing soft-matter or biological systems. One of our goals is to bring insights from soft matter physics to biomaterials sciences and living phenomena. We are also interested in investigating colloidal phenomena for medical applications.

Directions

  • Fluid mechanics of dense particulate suspensions

The rheology and fluid mechanics of particle suspensions remain a challenging problem. Dissipative dynamics of microscale particles require consideration of constraints such as contact forces that deprive them of freedom of tangential motion and the incompressibility of the fluid that fills the gaps between particles. We have introduced new simulation methods to address the nonequilibrium physics in flowing dense suspensions.

颗粒悬浮液的流变学和流体力学是一个具有挑战性的问题。细颗粒之间的耗散需要考虑一些特殊的力学约束，例如限制切向运动的接触力和颗粒隙间流体的不可压缩性。我们引入了全新的模拟方法来处理浓悬液流中的非平衡物理问题。

Simulation software

Romain Mari と2012年から開発してきた懸濁液シミュレーションのコード

  • New simulation approach (LubDEM +coarse-grained CFD) for non-uniform flows.

Rheology

We are working with ARES-G2 rheometor.

ARES-G2

Grants

Ryohei SETO

  • NSFC-RFIS II (外国学者研究基金项目, 外国优秀青年学者) 12150610463 [2022–2023]
    Computational rheology to investigate aging effects of composite materials

  • NSFC 面上项目 12174390 [2022–2025]
    New simulation scheme for migration and clogging of dense suspensions in channel flow

Zhongqiang XIONG 熊钟强

  • NSFC 理论物理专款研究项目 (National Natural Science Foundation of China for Theoretical Physics research project) 12247174 [2022–2023]
    填充高分子流变本构模型 (Rheological Constitutive Models for Particles Filled Polymer)
  • NSFC 青年科学基金 (National Natural Science Foundation of China Youth Science Fund), 22403021 [2025–2027]
    滑环高分子耦合滑动动力学模型 (Sliding Coupling Dynamics model of Slide-Ring Polymers)

Yujie JIANG 蒋玉杰

  • 博士后面上基金 2022M723114 [2022–2023]
    掺杂颗粒凝胶的动力学研究 (Gelation dynamics in gel-granular composites)

これまでの研究

  • シアシックニング（剪断増粘挙動）

    • せん断増粘は、懸濁液の流動を速めようと応力を高めると、急激に粘性抵抗が高まり、流動が遅くなる、または硬化するという現象です。
    • 接触した時に働く摩擦力のおかげで、滑らずに法線方向へ大きな力を伝達できるようになることが、せん断増粘の本質です。
    • せん断応力が弱い時は、粒子間に働く静電斥力やブラウン運動の影響で、粒子間に隙間が空いています。強いせん断応力下では、粒子間の隙間を保てなくなり、上述のような摩擦的な接触が起こります。