Unit in scalarTransportFoam

jyin · December 21, 2022, 06:43

Dear Forums,

I used scalarTransportFoam to simulate species transport in a tube. The species is defined between 0 and 1. But I saw same literature state that "we set species A is 1kg/m3". I was confused that how to set species with unit (kg/m3) in scalarTransportFoam? Anyone know the reason and how to set the unit? Thanks in advance!

Swirl · December 26, 2022, 10:00

As far as I am aware, the value between 0 and 1 represents the mass fraction of whichever species you are simulating, which is allway without units. The partial density of specie A can then be calculated by multiplying the mass fraction of A and overall density in each cell.

December 21, 2022, 06:43	Unit in scalarTransportFoam	#1
jyin New Member Jun Yin Join Date: Jan 2019 Posts: 5 Rep Power: 7	Dear Forums, I used scalarTransportFoam to simulate species transport in a tube. The species is defined between 0 and 1. But I saw same literature state that "we set species A is 1kg/m3". I was confused that how to set species with unit (kg/m3) in scalarTransportFoam? Anyone know the reason and how to set the unit? Thanks in advance!

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December 26, 2022, 10:00		#2
Swirl Member Join Date: Jun 2020 Posts: 49 Rep Power: 5	As far as I am aware, the value between 0 and 1 represents the mass fraction of whichever species you are simulating, which is allway without units. The partial density of specie A can then be calculated by multiplying the mass fraction of A and overall density in each cell.