Stability investigation of axisymmetric stenotic flows

C. Brehm, F. Reize, H. F. Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The early stages of laminar-turbulent transition in stenotic flows is studied by solving the full Navier-Stokes equations in cylindrical coordinates. For the linear stability analysis and the fully nonlinear direct numerical simulations, both steady and unsteady inflow velocity profiles are considered. The initial linear growth of small three-dimensional disturbances in axisymmetric stenotic basic flows for different Reynolds numbers and degrees of stenosis is investigated by considering the linearized Navier-Stokes equations in disturbance flow formulation. By introducing pulse disturbances different types of instability mechanisms can be analyzed such as biglobal instabilities, transient growth, and convective wave-like instabilities. All three types of instability mechanisms have been found to be relevant for the transition process in stenotic flows. Furthermore, nonlinear direct numerical simulations are employed to investigate which of the different instability mechanisms identified in the linear stability analysis are most relevant for the transition process.

Original languageEnglish (US)
Title of host publication41st AIAA Fluid Dynamics Conference and Exhibit
StatePublished - Dec 1 2011
Event41st AIAA Fluid Dynamics Conference and Exhibit 2011 - Honolulu, HI, United States
Duration: Jun 27 2011Jun 30 2011

Publication series

Name41st AIAA Fluid Dynamics Conference and Exhibit

Other

Other41st AIAA Fluid Dynamics Conference and Exhibit 2011
CountryUnited States
CityHonolulu, HI
Period6/27/116/30/11

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy Engineering and Power Technology
  • Aerospace Engineering
  • Mechanical Engineering

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    Brehm, C., Reize, F., & Fasel, H. F. (2011). Stability investigation of axisymmetric stenotic flows. In 41st AIAA Fluid Dynamics Conference and Exhibit (41st AIAA Fluid Dynamics Conference and Exhibit).