Periodic BCs for flow through body centered cubic

Luigi_ · January 25, 2011, 14:09

I'm trying to model fully developed flow through a cube past spheres where the spheres are arranged in a body centered cubic arrangement. I want to model an infinite geometry and so am using periodic BCs. I'm confused about how periodic interfaces work with the surfaces' boundary conditions.

For the inlet and outlet surfaces of my geomtry, i have linked them as an interface with the periodic fully developed interface. Then what boundary type should these surfaces be? When they are specified as inlet and outlet i get flow perpendicular to the inlet and outlet. Or should they be walls where i impose flow with the pressure jump used in the interface?

For the other surfaces, I have created interfaces of the two side walls together, and then the top and bottom of the cube together-- using periodic fully developed interface with 0 pressure jump, where the BCs of these surfaces are walls. I think this is working.

My question is just what boundary condition type should be used for periodic interfaces. Thanks!

xamo · January 26, 2011, 05:48

Hi Luigi,

If I understand you correct you want to set up partial cyclic boundaries for the inlet and outlet like in STARCD. Either the mass flow is fixed or the pressure drop is known.

This is not possible up to CCM Version 5.06. As far as I know this will be possible in Version 6.02.

Regards
xamo

January 25, 2011, 14:09	Periodic BCs for flow through body centered cubic	#1
Luigi_ New Member Luigi Francisco Join Date: Jan 2011 Posts: 8 Rep Power: 15	I'm trying to model fully developed flow through a cube past spheres where the spheres are arranged in a body centered cubic arrangement. I want to model an infinite geometry and so am using periodic BCs. I'm confused about how periodic interfaces work with the surfaces' boundary conditions. For the inlet and outlet surfaces of my geomtry, i have linked them as an interface with the periodic fully developed interface. Then what boundary type should these surfaces be? When they are specified as inlet and outlet i get flow perpendicular to the inlet and outlet. Or should they be walls where i impose flow with the pressure jump used in the interface? For the other surfaces, I have created interfaces of the two side walls together, and then the top and bottom of the cube together-- using periodic fully developed interface with 0 pressure jump, where the BCs of these surfaces are walls. I think this is working. My question is just what boundary condition type should be used for periodic interfaces. Thanks!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Pressure BCs or Periodic BCs for model of frost on vertical surface?	andy.eco	FLUENT	2	March 26, 2010 03:02
Periodic BC's and Stone SIP Solver	ilyasy	Main CFD Forum	0	August 14, 2009 07:04
Periodic BC's for Thermal Lattice Boltzmann Method	anuhar	Main CFD Forum	0	May 4, 2009 04:45
Periodic and sym. BCs	selim	CFX	2	July 16, 2007 14:01
Want to make clear about periodic BCs	babyface	Main CFD Forum	0	December 3, 2002 21:07

January 26, 2011, 05:48		#2
xamo New Member Join Date: Mar 2009 Posts: 20 Rep Power: 17	Hi Luigi, If I understand you correct you want to set up partial cyclic boundaries for the inlet and outlet like in STARCD. Either the mass flow is fixed or the pressure drop is known. This is not possible up to CCM Version 5.06. As far as I know this will be possible in Version 6.02. Regards xamo