initial and boundary conditions for flapping hovering flight

quarkz · April 12, 2010, 11:57

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!

dominic · April 13, 2010, 00:10

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

saeid.oqaz · August 28, 2012, 13:08

hi quarkz
you metioned use convective outlet B.C for hovering flight.
is that correct?

thanks

quarkz · August 30, 2012, 12:22

I currently used symmetry BC, although I believe convective outlet should work fine too.

saeid.oqaz · August 30, 2012, 14:11

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?

April 12, 2010, 11:57	initial and boundary conditions for flapping hovering flight	#1
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 414 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!

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April 13, 2010, 00:10		#2
dominic 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, 13:08		#3
saeid.oqaz 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, 12:22		#4
quarkz Senior Member TWB Join Date: Mar 2009 Posts: 414 Rep Power: 19	I currently used symmetry BC, although I believe convective outlet should work fine too.