User field function "if" condition

djack · May 15, 2013, 10:04

Hi,
I'm having one interface between two rooms at different temperature.
Natural convection is accuring between the rooms.
Hot air is entering at the top of the interface and cold air is leaving at the bottom.
My question is how can I define an unser field function (and surface integral) to measure the flow entering the interface.
I tried the following but didn't work :
($$Velocity[0] >= 0) ? $$Velocity[0] : 0
Can you help me, I'm not confortable with field function.
Thanks,
Djack

cwl · May 15, 2013, 17:20

Hi
I've tried the problem you described - and it works fine exactly with the field function you wrote and Surface Integral over the Interface between rooms.
Describe the problem, please

djack · May 16, 2013, 03:35

You're absolutly right !
Thanks

May 15, 2013, 10:04	User field function "if" condition	#1
djack New Member Join Date: Jul 2012 Posts: 9 Rep Power: 13	Hi, I'm having one interface between two rooms at different temperature. Natural convection is accuring between the rooms. Hot air is entering at the top of the interface and cold air is leaving at the bottom. My question is how can I define an unser field function (and surface integral) to measure the flow entering the interface. I tried the following but didn't work : ($$Velocity[0] >= 0) ? $$Velocity[0] : 0 Can you help me, I'm not confortable with field function. Thanks, Djack

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May 15, 2013, 17:20		#2
cwl Senior Member Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 435 Rep Power: 17	Hi I've tried the problem you described - and it works fine exactly with the field function you wrote and Surface Integral over the Interface between rooms. Describe the problem, please

May 16, 2013, 03:35		#3
djack New Member Join Date: Jul 2012 Posts: 9 Rep Power: 13	You're absolutly right ! Thanks