Internal flow and wall interaction in a partly blocked flexible channel (1st report, modeling, numerical algorithm and general characteristics of the flow)

Tameo Nakanishi, Masami Nakano, Yohei Endo

Research output: Contribution to journalArticlepeer-review

Abstract

When a constriction is formed inside a blood vessel, a self-excited oscillation of the blood flow and the vessel surface may occur. Numerical investigation has been conducted for incompressible viscous flows through a 2 D channel with a flexible upper wall and a rigid lower wall. The flexible wall possesses mass, surface tension and a dumping factor. An obstacle modeled after the constriction was placed close to the inlet on the lower wall. The interactions of the internal flow and the deformation of the upper wall were elucidated for Reynolds numbers ranging from 800 to 5 000. Steady solutions were obtained for Reynolds number below 1 000 and unsteady solutions above this value. It was found that at the Reynolds number above 2 500, a squeezing motion of the upper wall periodically occurs just behind the obstacle and propagates downstream. The flow rate at the outlet periodically varies due to the unsteady motion of the upper wall. The dimensionless period and the amplitude of the flow rate oscillation increase with increasing Reynolds number.

Original languageEnglish
Pages (from-to)2678-2686
Number of pages9
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume67
Issue number663
DOIs
Publication statusPublished - 2001 Nov
Externally publishedYes

Keywords

  • Bio-fluid mechanics
  • Flexible channel
  • Fluid-structure interaction
  • Numerical analysis
  • Viscous flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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