CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

point of inflexion

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   August 5, 2002, 00:20
Default point of inflexion
Posts: n/a
Hi, Velocity profile of jet flow has a point of inflexion, what its mean and why jet flow has a point of inflexion. Thanks
  Reply With Quote

Old   August 6, 2002, 04:09
Default Re: point of inflexion
Lionel Larcheveque
Posts: n/a

Because of the existence of an inflection point for the mean velocity profile, jet flows as shear layers and wakes are subject to Kelvin-Helmholtz instabilities (Rayleigh's inflection point criterion). It results in periodic vortices shedding (sometime called coherent structures) growing and pairing while convected in the streamwise direction. If the convection velocity is supersonic with regards to the external flow, these structures can generates Mach waves (somehow similar to shock waves) and emit very strong noise.

For further informations, see for instance: P. Huerre and M. Rossi, Hydrodynamic instabilities in open flows, in "Hydrodynamics and nonlinear instabilities", edited by C. Godreche and P. Manneville, pp 81-214, Cambridge University Press, 1998.

Hope this helps.
  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
block-structured mesh for t-junction Robert@cfd ANSYS Meshing & Geometry 20 November 11, 2011 05:59
Problem with UDF compiling for kTkLW model Wantami FLUENT 0 July 18, 2011 05:11
matching variable data with grid point data anfho OpenFOAM Programming & Development 0 May 6, 2011 15:28
Gmsh and samplesurface touf Open Source Meshers: Gmsh, Netgen, CGNS, ... 2 December 10, 2007 03:27
CFX4.3 -build analysis form Chie Min CFX 5 July 12, 2001 23:19

All times are GMT -4. The time now is 13:40.