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


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

LinkBack Thread Tools Display Modes
Old   May 9, 2000, 22:01
Default stall
Posts: n/a
Hi! I don't know if this is the right place to ask the question. but anyway, I'm a little confused on the term stall on airfoil flow, some books categorize stall as Leading Edge stall, Trailing Edge Stall and Thin Airfoil Stall, while some other (in journal papers usually, without exactly defining the terms) use the term Static and Dynamic stall. I undetstand the first 3 terms, but am not sure of the latter two. I've tried searching through aerodynamic books but none have used these terms. Could anyone help me out. Thanks in advance.

  Reply With Quote

Old   May 10, 2000, 03:03
Default Re: stall
Tim Franke
Posts: n/a

static stall means the decay of lift of an airfoil having exceeded a certain angle of attack. In this case the airfoil is in rest. If that airfoil executes a pitching motion (mostly oscillatory), stall occurs delayed (at higher aoa) compared with the static case and so you get higher max lift coefficents. The lift for the downstroke motion is on a lower level because of delayed reattachement of the flow. So there's a hysteresis in lift (in drag and moment coefficient as well). This is a typical characteristic of dynamc stall. Dynamic stall is a phenomen which occurs e.g. at helicopter rotor blades or wind turbines.

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
stall simulation Kevin Lamers FloEFD, FloWorks & FloTHERM 1 January 29, 2009 07:24
Airfoil in Stall - Turbulent model. Jack FLUENT 0 November 7, 2008 03:53
Airfoil at stall angle cfd_newbie FLUENT 10 February 5, 2008 12:33
static stall atrh Main CFD Forum 1 March 9, 2004 07:07
Looking for experiments in dynamic stall Anton Lyaskin Main CFD Forum 0 February 10, 2003 04:57

All times are GMT -4. The time now is 08:41.