# guidance, flapper motion problem

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

 April 3, 2011, 09:18 guidance, flapper motion problem #1 New Member   Join Date: Apr 2011 Posts: 2 Rep Power: 0 (see repost) Last edited by williaq; April 3, 2011 at 09:54.

 April 3, 2011, 09:34 Re-post: guidance, flapper motion problem #2 New Member   Join Date: Apr 2011 Posts: 2 Rep Power: 0 Repost: for some reason, my ascii-art picture was getting corrupted. Re-posting now with placeholders "." inserted.\ ------------------------ Greetings all -- I'm a professional mechanical engineer, but mostly a mechanisms guy until now. I recently joined a small firm, and it's fallen to me to pursue some questions on a new project involving airflow. So I'm an experienced engineer, but a CFD newbie, and I know better than to reinvent the wheel -- I'd like to gain from the wisdom here. I would appreciate guidance, both the big-picture, *and* nitty gritty details. (I've done some searches on the forums, but feel free to redirect me if my questions are too far back). Here's the deal: Below is an ascii-art side-view of the physical setup. In the picture, let x be the horizontal, and y be the vertical direction, and z be out of the page Our system is quite simple -- think of it as a pipe with a pivoting damper. We have a rectangular tube, with one end sealed (except an inlet slit). and a damper/flapper in the middle, which pivots about a horizontal (z-direction) axis. A relative vacuum is applied at the outlet thus drawing air through the inlet, which is a horizontal slit, located at an arbitrary height. (Symbology below: x = tube wall; \ = flapper; o = flapper pivot; .=placeholder, so that the picture doesn't get corrupted when I post this message) xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x.........\................................ . flow x............\....................(outlet).. x.............\............................ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ^ y | | o--> x z I would like to characterize the movement at the damper, for various flow rates, assuming a low-friction axis. Both with steady-state, and (secondarily) in transient flows. We've noticed instabilities and even oscillations in some mockups, and want to understand the factors governing this motion. So there it is -- Guidance as I get started? (no guidance too basic). What is a suitable software for me to use, best way to approach a problem of this sort... Thanks, --Will Last edited by williaq; April 3, 2011 at 09:52.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post CH FLUENT 8 April 2, 2014 10:56 maverick OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 June 18, 2011 04:36 kabat73 FLUENT 8 May 9, 2010 04:26 Giuliano FLUENT 2 November 17, 2006 03:44 Hila FLUENT 0 August 19, 2006 04:19

All times are GMT -4. The time now is 06:24.