# initial and boundary conditions for flapping hovering flight

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 April 12, 2010, 10:57 initial and boundary conditions for flapping hovering flight #1 Senior Member   TWB Join Date: Mar 2009 Posts: 402 Rep Power: 19 Hi, I'm thinking of doing some simulations of hovering flight. in the past, i've been doing simulations of flapping flight. i simply set u=1,v=0 as the initial condition for the entire domain. the boundary condition is u=1 at the left boundary, indicating inflow. outflow at the right uses convective boundary condition. du/dy=0 for the top/bottom boundary. however, how should the boundary and initial conditions since it's hovering. hence, u/=1. pls help. tks!

 April 12, 2010, 23:10 #2 Member   Dominic Chandar Join Date: Mar 2009 Location: United Kingdom Posts: 31 Rep Power: 17 Hi, As the name suggests -- hovering flight -- there is no forward motion, you can use initial conditions u = v = 0 everywhere. Its just the same flapping motion of the wing in still fluid. As for the boundary conditions, use u = 0 for inlet and the same outlet B.C you have mentioned. Dominic

 August 28, 2012, 12:08 #3 New Member   saeid oqaz Join Date: Feb 2012 Posts: 19 Rep Power: 14 hi quarkz you metioned use convective outlet B.C for hovering flight. is that correct? thanks

 August 30, 2012, 11:22 #4 Senior Member   TWB Join Date: Mar 2009 Posts: 402 Rep Power: 19 I currently used symmetry BC, although I believe convective outlet should work fine too.

August 30, 2012, 13:11
#5
New Member

saeid oqaz
Join Date: Feb 2012
Posts: 19
Rep Power: 14
Quote:
 Originally Posted by quarkz I currently used symmetry BC, although I believe convective outlet should work fine too.
i use openfoam. i believe in outlet use fixed value=0 for p and inletoutlet for U which combination of fixed value & fixed gradient for reverse flow in outlet.

other B.C you used seem correct except outlet.
why you use symmetry BC for outlet?

 Thread Tools Search this Thread Search this Thread: Advanced Search 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 Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Saturn CFX 58 July 3, 2020 01:13 ankgupta8um OpenFOAM Running, Solving & CFD 7 January 15, 2011 13:38 Pankaj CFX 9 November 23, 2009 04:05 msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58 Mark CFX 6 November 15, 2004 15:55

All times are GMT -4. The time now is 20:14.

 Contact Us - CFD Online - Privacy Statement - Top