Are extruded boundaries good practice for opening BCs as well?

J_Keel · March 5, 2015, 19:30

Hi,

Thanks for taking the time to read my post. I'm aware that if you have an outlet it is usually good practice to place/extrude the outlet further downstream to prevent recirculation or inflow. I will be modeling a dynamic domain with several openings and was wondering whether there are any advantages to employing the same technique. Some of the openings are placed relatively close together and I'm worried they may interfere with each other. Does anyone have any comments on this?

Thanks for your time.

ghorrocks · March 5, 2015, 22:20

The golden rule is you put boundary conditions at locations where you can describe the flow, then you select boundary conditions which match that description. If the outlets interfere with each other that either needs to be part of the boundary condition selection or you have to move the boundary to somewhere you can describe the flow.

March 5, 2015, 19:30	Are extruded boundaries good practice for opening BCs as well?	#1
J_Keel New Member Join Date: Jun 2014 Posts: 8 Rep Power: 12	Hi, Thanks for taking the time to read my post. I'm aware that if you have an outlet it is usually good practice to place/extrude the outlet further downstream to prevent recirculation or inflow. I will be modeling a dynamic domain with several openings and was wondering whether there are any advantages to employing the same technique. Some of the openings are placed relatively close together and I'm worried they may interfere with each other. Does anyone have any comments on this? Thanks for your time.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to set BCs programmatically	incompressible	OpenFOAM Programming & Development	6	November 20, 2017 03:47
Dealing with BC's in OF 1.6	vkrastev	OpenFOAM Running, Solving & CFD	5	September 4, 2012 12:58
[ICEM] Extruded unstructured mesh association with boundaries, volumes, etc.	macfly	ANSYS Meshing & Geometry	6	August 7, 2012 17:13

March 5, 2015, 22:20		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	The golden rule is you put boundary conditions at locations where you can describe the flow, then you select boundary conditions which match that description. If the outlets interfere with each other that either needs to be part of the boundary condition selection or you have to move the boundary to somewhere you can describe the flow.