what are the boundary conditions for the propeller ?

salamony1992 · July 13, 2016, 02:39

Hello!

I am trying to put a small propeller behind airfoil (2D case), the model of the propeller will follow the actuatior disk theory. there is no propeller design yet, just a discontinuity to increase the flow momentum to produce thrust.
the picture is attached to be more clear.

it will be modelled as a square with air inlet and exit. the mass of air entered the propeller will gain pressure and go out to the domain again.

my question is:
what boundary conditions i shall set in the propeller enternce and exit??
how i can control the thrust required?

thanks in advance

ghorrocks · July 14, 2016, 07:11

The rear boundary should probably be an outlet with either defined static pressure or average pressure.

You control the thrust by varying the strength of the momentum source.

salamony1992 · July 14, 2016, 13:39

Quote:

Originally Posted by ghorrocks

The rear boundary should probably be an outlet with either defined static pressure or average pressure.

You control the thrust by varying the strength of the momentum source.

Thanx for your reply, but its not clear
U mean that the face near the trailing edge is pressure outlet?

ghorrocks · July 14, 2016, 20:03

The boundary face on the right side, labelled opening should probably be an outlet as I mentioned. An opening should work too if you want to go that way.

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July 14, 2016, 07:11		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The rear boundary should probably be an outlet with either defined static pressure or average pressure. You control the thrust by varying the strength of the momentum source.

July 14, 2016, 20:03		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The boundary face on the right side, labelled opening should probably be an outlet as I mentioned. An opening should work too if you want to go that way.