Periodic Boundary Condition

doug · April 14, 2009, 18:10

All,

I'm doing 2D couette flow and want to set up periodic boundary conditions in fluent. I'm specifying dpdx rather than the mass flow rate, but for some reason when I plot the pressure, it looks like it's trying to match the pressures at the two ends rather than enforcing the pressure drop between the inlet and outlet. Any ideas?

Thanks.

sbaffini · April 14, 2009, 19:05

As also stated in the user's guide, the part of the pressure that the simulation solves for is the periodic part. The linear variation from inlet to outlet is already considered and not shown in any plot. It just acts as a costant forcing term.

April 14, 2009, 18:10	Periodic Boundary Condition	#1
doug Member Doug Hunsaker Join Date: Mar 2009 Location: Logan, UT Posts: 63 Rep Power: 17	All, I'm doing 2D couette flow and want to set up periodic boundary conditions in fluent. I'm specifying dpdx rather than the mass flow rate, but for some reason when I plot the pressure, it looks like it's trying to match the pressures at the two ends rather than enforcing the pressure drop between the inlet and outlet. Any ideas? Thanks.

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April 14, 2009, 19:05		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,151 Blog Entries: 29 Rep Power: 39	As also stated in the user's guide, the part of the pressure that the simulation solves for is the periodic part. The linear variation from inlet to outlet is already considered and not shown in any plot. It just acts as a costant forcing term.