CEL for Interface Curvature

Miky1020 · October 23, 2009, 13:35

Hi,

I'm working in a two phase flow simulation and I need to define a CEL function depends on interface curvature. I have looked for this variable in CFX-Pre but I haven't found it, so I think I must to define it. I know interface curvature is define by divergence of normal vector pointing from primary fluid to secondary fluid, but I don't know if is possible (and how) to write this expression.

Thanks in advance

Miguel Baritto

ghorrocks · October 24, 2009, 07:02

Is it to be calculated during the solution or for post-processing? It should be much easier to do it in post-processing.

Miky1020 · October 24, 2009, 13:38

Hi Glenn,

I'm using two resistance model for heat transfer between liquid and vapour in stratified two phase flow, so I need to specify interfacial heat transfer coefficient. I need this CEL expression: h=ho*K/Ko, where h is HTC, ho is a referencia value for HTC, K is interface curvature and Ko is a reference value for curvature.

I don't know how (if is possible) write K in CEL.

Thanks

Miguel

October 23, 2009, 13:35	CEL for Interface Curvature	#1
Miky1020 New Member Miguel Baritto Join Date: Mar 2009 Location: Caracas,Venezuela Posts: 16 Rep Power: 17	Hi, I'm working in a two phase flow simulation and I need to define a CEL function depends on interface curvature. I have looked for this variable in CFX-Pre but I haven't found it, so I think I must to define it. I know interface curvature is define by divergence of normal vector pointing from primary fluid to secondary fluid, but I don't know if is possible (and how) to write this expression. Thanks in advance Miguel Baritto

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October 24, 2009, 07:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Is it to be calculated during the solution or for post-processing? It should be much easier to do it in post-processing.

October 24, 2009, 13:38		#3
Miky1020 New Member Miguel Baritto Join Date: Mar 2009 Location: Caracas,Venezuela Posts: 16 Rep Power: 17	Hi Glenn, I'm using two resistance model for heat transfer between liquid and vapour in stratified two phase flow, so I need to specify interfacial heat transfer coefficient. I need this CEL expression: h=ho*K/Ko, where h is HTC, ho is a referencia value for HTC, K is interface curvature and Ko is a reference value for curvature. I don't know how (if is possible) write K in CEL. Thanks Miguel