# Diverse microstructures of magnetorheological fluid induced by shear flows (A direct numerical investigation)

https://mdr.nims.go.jp/datasets/61277946-d7bb-49a6-867c-56c56c5e793c

## File

- [Ando Paper 21_2026jfst0004.pdf](https://mdr.nims.go.jp/filesets/efb49217-ad65-4eba-b5b9-ae6259bd85e8/download) ([Detail](https://mdr.nims.go.jp/filesets/efb49217-ad65-4eba-b5b9-ae6259bd85e8.md))

## Id

61277946-d7bb-49a6-867c-56c56c5e793c

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-04-16T07:33:30.427800Z

## Updated at

2026-04-16T23:55:22.131933Z

## Published at

2026-04-17T01:27:22.968787Z

## Doi



## First published url

https://doi.org/10.1299/jfst.2026jfst0004

## Date published

2026-03-12

## Recorded date published

2026

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Diverse microstructures of magnetorheological fluid induced by shear flows
    (A direct numerical investigation)
  title_type: original
  lang: en

## Description

- description: 'This study presents numerical simulations of magnetorheological (MR)
    fluids under a wide range of shear rates using the Euler-Lagrange hybrid scheme.
    In a confined space between plane-parallel walls with gravity neglected, under
    a constant magnetic field and particle volume fraction, the formation of magnetic
    particle microstructures and the shear-thinning behavior of the apparent viscosity
    of the MR fluid are investigated. As the shear rate increases, the microstructures
    formed by the magnetic particles transition from chain-like to sheet-like formations
    around a Mason number (Mn) of 1. Beyond a certain shear threshold, these structures
    begin to aggregate toward the stationary wall, while particles move away from
    the moving wall. For Mn = 30, hydrodynamic two-phase separation is observed with
    respect to the vertical direction of the walls: a particle-free region appears
    on the moving wall side, while an aggregate structure without interparticle contact
    forms on the stationary wall side. With further increase in shear rate to Mn =
    100, the upper-layer particles of the aggregates detach and disperse. The two-phase
    separation observed at Mn = 30 is induced by magnetic and hydrodynamic interactions,
    and the aggregation toward the stationary wall is attributed to the constraint
    of particle rotation by applied magnetic field. These findings indicate that the
    presence or absence of particle rotation influences the hydrodynamic lift forces
    acting on the particles. The ratio of the magnetic torque induced by the applied
    magnetic field to the hydrodynamic torque is as a key factor governing the microstructure
    of magnetic particles in MR fluids.'
  description_type: abstract
  lang: und

## Creator

- name: Tsutomu ANDO
  role: author
- name: Ryoga FUJII
  role: author
- name: Osamu KOIKE
  role: author
- name: Rei TATSUMI
  role: author
- name: Noriyuki HIROTA
  role: author
  orcid: https://orcid.org/0000-0001-9189-3673
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Japan Society of Mechanical Engineers

## Managing organization



## Keyword

- subject: Magnetorheological fluid
  schema: not_defined
- subject: Shear flow
  schema: not_defined
- subject: Microstructure of particles
  schema: not_defined
- subject: Direct numerical simulation
  schema: not_defined
- subject: Solid-liquid multiphase flow
  schema: not_defined
- subject: Magnetic particle
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Fluid Science and Technology
  issn: '18805558'
  volume: '21'
  issue: '1'
  article_number: 2026jfst0004

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## Fileset

- id: efb49217-ad65-4eba-b5b9-ae6259bd85e8
  filename: Ando Paper 21_2026jfst0004.pdf
  content_type: application/pdf
  size: 4040249
  md5: f0bcad7556c820bc1a7d7018f2f5a7e5

## Thumbnail

fileset_id: efb49217-ad65-4eba-b5b9-ae6259bd85e8
filename: Ando Paper 21_2026jfst0004.pdf