alpha.water-question in the application of interIsoFoam

philiplu · September 25, 2019, 08:48

hello,

some results of certain cells in certain time step of an (random) interIsoFoam-application:

alpha.water is 0, but
U is not 0 e.g. (0 0 -2.31698)

thus by assuming that "alpha.water=0" refers to e.g. air (i.e. no water), I wonder if U = e.g. (0 0 -2.31698) namely not U = 0, is logical

thank you in advance

mrishi · September 25, 2019, 10:01

U is not meant to be zero if alpha.water is 0. U is the velocity shared by the mixture of phases, so its value tells you value of whatever composition of mixture you have in a given cell. In this case it would correspond to velocity of air.

philiplu · September 25, 2019, 20:49

Hello, mrishi,

thank you for the reply and the clear explanation.

thanks, regards

September 25, 2019, 08:48	alpha.water-question in the application of interIsoFoam	#1
philiplu Member philip lu Join Date: Aug 2019 Posts: 87 Rep Power: 7	hello, some results of certain cells in certain time step of an (random) interIsoFoam-application: alpha.water is 0, but U is not 0 e.g. (0 0 -2.31698) thus by assuming that "alpha.water=0" refers to e.g. air (i.e. no water), I wonder if U = e.g. (0 0 -2.31698) namely not U = 0, is logical thank you in advance

September 25, 2019, 20:49	thank you, mrishi	#3
philiplu Member philip lu Join Date: Aug 2019 Posts: 87 Rep Power: 7	Hello, mrishi, thank you for the reply and the clear explanation. thanks, regards

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September 25, 2019, 10:01		#2
mrishi Member Rishikesh Join Date: Apr 2016 Posts: 63 Rep Power: 10	U is not meant to be zero if alpha.water is 0. U is the velocity shared by the mixture of phases, so its value tells you value of whatever composition of mixture you have in a given cell. In this case it would correspond to velocity of air.