How define species in Fluent

sandeeprapol · May 12, 2015, 02:31

Hi,
I want define moist air (air + h20 ) using species in Ansys Fluent. Can anyone tell me the steps how to define moist air with help of Relative Humidity.

Thanks & Regards,
Sandeep Rapol

LukeS · May 12, 2015, 03:36

Hi there, first you must select species transport from 'Models'>Species.
You will now find H2O added as a material.

Then from boundary conditions you can select a source (can be a wall, inlet etc...) then edit and go to species. There you will find H2O and you can specify a mass fraction of H2O. If you are unsure you can use a humidity calculator to convert relative humidity into mass fraction (or psychrometric chart).

Hope this helps

aiouss · May 12, 2015, 08:53

thank you it is very usefull , but how can I use the condesation - evaporation effect in fluent because the moist air change the phase with the change in temperature ambiant.
thank you very much
I am waiing for the reply of any one know how to use condesation-evaporation effect

Bran · July 9, 2020, 14:40

Aiouss,

I know this is many years later. But were you able to identify a way to simulate the condensation/evaporation effect?

All the best

May 12, 2015, 02:31	How define species in Fluent	#1
sandeeprapol New Member Sandeep Rapol Join Date: Feb 2015 Posts: 11 Rep Power: 11	Hi, I want define moist air (air + h20 ) using species in Ansys Fluent. Can anyone tell me the steps how to define moist air with help of Relative Humidity. Thanks & Regards, Sandeep Rapol aiouss likes this.

May 12, 2015, 03:36		#2
LukeS New Member Join Date: May 2015 Posts: 7 Rep Power: 10	Hi there, first you must select species transport from 'Models'>Species. You will now find H2O added as a material. Then from boundary conditions you can select a source (can be a wall, inlet etc...) then edit and go to species. There you will find H2O and you can specify a mass fraction of H2O. If you are unsure you can use a humidity calculator to convert relative humidity into mass fraction (or psychrometric chart). Hope this helps aiouss, MelonPan, Bran and 1 others like this.

May 12, 2015, 08:53		#3
aiouss New Member abidi saad aissa Join Date: Apr 2012 Posts: 8 Rep Power: 14	thank you it is very usefull , but how can I use the condesation - evaporation effect in fluent because the moist air change the phase with the change in temperature ambiant. thank you very much I am waiing for the reply of any one know how to use condesation-evaporation effect Bran likes this.

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July 9, 2020, 14:40		#4
Bran New Member Join Date: Jul 2019 Posts: 27 Rep Power: 6	Aiouss, I know this is many years later. But were you able to identify a way to simulate the condensation/evaporation effect? All the best