initial and boundary conditions for flapping hovering flight

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 April 12, 2010, 10:57 initial and boundary conditions for flapping hovering flight #1 Senior Member   TWB Join Date: Mar 2009 Posts: 105 Rep Power: 8 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 New Member   Dominic Chandar Join Date: Mar 2009 Location: Singapore Posts: 22 Rep Power: 8 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: 5 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: 105 Rep Power: 8 I currently used symmetry BC, although I believe convective outlet should work fine too.

August 30, 2012, 13:11
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saeid oqaz
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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?

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