Boundry help?

BrendaEM · October 17, 2014, 17:58

Hi,

I am a beginner, and I am having problems, but perhaps I am not understanding boundary conditions, as read in the manual : )

My case is a simple NACA duct.
I've meshed it in Salome in tetrahedrons.
I've created an inlet, outlet1 (air passing the duct and terminating), outlet2 (captured by duct and terminating), and nowall for the 3 sides where I've truncated the air volume where I want the simulation to be end, which I thought I was to use "Empty" condition, but now I read that might be for 2D solves (only).

What boundary condition should I use.

[This thread might not be here if OpenFoam had better documentation.]

BrendaEM · October 17, 2014, 20:11

I looked at the tutorials again; most are 2D or are naturally enclosed volumes that in the real world would not be clipped.

The "slip" boundary would seem inappropriate because: even if air slipped along it, pressure could still build against it, correct?

October 17, 2014, 17:58	Boundry help?	#1
BrendaEM Member Brenda EM Join Date: Jan 2012 Posts: 38 Rep Power: 14	Hi, I am a beginner, and I am having problems, but perhaps I am not understanding boundary conditions, as read in the manual : ) My case is a simple NACA duct. I've meshed it in Salome in tetrahedrons. I've created an inlet, outlet1 (air passing the duct and terminating), outlet2 (captured by duct and terminating), and nowall for the 3 sides where I've truncated the air volume where I want the simulation to be end, which I thought I was to use "Empty" condition, but now I read that might be for 2D solves (only). What boundary condition should I use. [This thread might not be here if OpenFoam had better documentation.] Last edited by BrendaEM; October 17, 2014 at 19:52.

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October 17, 2014, 20:11		#2
BrendaEM Member Brenda EM Join Date: Jan 2012 Posts: 38 Rep Power: 14	I looked at the tutorials again; most are 2D or are naturally enclosed volumes that in the real world would not be clipped. The "slip" boundary would seem inappropriate because: even if air slipped along it, pressure could still build against it, correct?