A question about C_YI(c,t,i) marco

becher97 · September 9, 2022, 04:56

According to the customization manual, C_YI(c,t,i) marco will return the species mass fraction of species i in thread t at cell c.
Assume a cell filled with half water and half air, 30% of the water phase is species i. So what will C_YI return? just 0.3 or 0.3*0.5=0.15?

Thanks!

Mars35 · September 11, 2022, 20:48

I am pretty sure it will return as 0.3.
you can try to set a wall concentration with a mass fraction of water 0.3 using udf. And compare the result with a mass fraction of 0.3 in the wall boundary condition (Species). They should be the same

September 9, 2022, 04:56	A question about C_YI(c,t,i) marco	#1
becher97 New Member becher Join Date: Dec 2018 Posts: 4 Rep Power: 7	According to the customization manual, C_YI(c,t,i) marco will return the species mass fraction of species i in thread t at cell c. Assume a cell filled with half water and half air, 30% of the water phase is species i. So what will C_YI return? just 0.3 or 0.3*0.5=0.15? Thanks!

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September 11, 2022, 20:48		#2
Mars35 New Member Join Date: Jun 2022 Posts: 27 Rep Power: 3	I am pretty sure it will return as 0.3. you can try to set a wall concentration with a mass fraction of water 0.3 using udf. And compare the result with a mass fraction of 0.3 in the wall boundary condition (Species). They should be the same