B.C. for an opening between inside and outside

sagila · July 2, 2012, 11:37

Dear all,

Which boundary condition is the best for an opening between inside and outside?
Note that the air flow is possible through this opening without any limitation.

Thank you in advance.

flotus1 · July 3, 2012, 02:50

In most cases, an opening would be a suitable choice.

It allows the flow to leave and enter the domain. An outlet would prevent the flow from entering the computational domain.

sagila · July 3, 2012, 04:28

Dear Alexander Stief,
Thank you for your reply.
I searched for the B.C. type of “opening”, but I have not found that.
Could you please let me know where I could define it? Or, just leave it and it would be automatically assumed as the opening?
Best regards,
sagila

flotus1 · July 3, 2012, 04:33

Sorry, my bad. The name "opening" only exists in CCM+.

In fluent, the "pressure outlet" corresponds to this type of boundary condition.

July 2, 2012, 11:37	B.C. for an opening between inside and outside	#1
sagila Member sagila Join Date: May 2012 Posts: 39 Rep Power: 13	Dear all, Which boundary condition is the best for an opening between inside and outside? Note that the air flow is possible through this opening without any limitation. Thank you in advance.

July 3, 2012, 02:50		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	In most cases, an opening would be a suitable choice. It allows the flow to leave and enter the domain. An outlet would prevent the flow from entering the computational domain.

July 3, 2012, 04:28		#3
sagila Member sagila Join Date: May 2012 Posts: 39 Rep Power: 13	Dear Alexander Stief, Thank you for your reply. I searched for the B.C. type of “opening”, but I have not found that. Could you please let me know where I could define it? Or, just leave it and it would be automatically assumed as the opening? Best regards, sagila

July 3, 2012, 04:33		#4
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Sorry, my bad. The name "opening" only exists in CCM+. In fluent, the "pressure outlet" corresponds to this type of boundary condition.