Boundary condition

Youngmj · October 17, 2016, 10:28

Hi, I am simulating the flow around three dimensional circular cylinder with Re=100. Now I am trying to assign boundary condition to top, bottom, front and back.
I have question about what is the difference between symmetryPlane and Cyclic?
I saw that symmetryPlane mean the symmetry for assigned plane without any gradient for normal direction.
Cyclic condition means that where is expected same pattern.

Could you explain more detail about it?

Plue, my last goal is to simulate inclined cylinder.
Can't I use both conditions for inclined cylinder because of asymmetry?
I am looking forward to get answer from you.

Thanks!

Best regards
Youngmin Jeong

Bazinga · October 19, 2016, 02:19

What do you exactly mean by top, bottom, front and back?
If I understand your problem correctly you should model the cylinder as no slip and the domain BC which are not inlet or outlet can be modeled as symmetry. I do not think you can use cyclic in your case.

October 17, 2016, 10:28	Boundary condition	#1
Youngmj New Member Youngmin JEong Join Date: Oct 2016 Posts: 3 Rep Power: 10	Hi, I am simulating the flow around three dimensional circular cylinder with Re=100. Now I am trying to assign boundary condition to top, bottom, front and back. I have question about what is the difference between symmetryPlane and Cyclic? I saw that symmetryPlane mean the symmetry for assigned plane without any gradient for normal direction. Cyclic condition means that where is expected same pattern. Could you explain more detail about it? Plue, my last goal is to simulate inclined cylinder. Can't I use both conditions for inclined cylinder because of asymmetry? I am looking forward to get answer from you. Thanks! Best regards Youngmin Jeong

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October 19, 2016, 02:19		#2
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 16	What do you exactly mean by top, bottom, front and back? If I understand your problem correctly you should model the cylinder as no slip and the domain BC which are not inlet or outlet can be modeled as symmetry. I do not think you can use cyclic in your case.