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-   -   initial and boundary conditions for flapping hovering flight (http://www.cfd-online.com/Forums/main/74939-initial-boundary-conditions-flapping-hovering-flight.html)

 quarkz April 12, 2010 10:57

initial and boundary conditions for flapping hovering flight

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 12, 2010 23:10

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 12:08

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

thanks

 quarkz August 30, 2012 11:22

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

 saeid.oqaz August 30, 2012 13:11

Quote:
 Originally Posted by quarkz (Post 379545) 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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