scalar source vs species transport

harsha002 · July 18, 2020, 03:16

I am working on a car park ventilation project. I would like to know which equation to be used(scalar source or transport species) and would like to know why it is better comparing the other
your help is much appreciated

bluebase · August 10, 2020, 18:33

You might need to check whether these terms are synonyms.

You likely mean, (Passive) scalar transport equations, do you? In that case such transport equation usually does not impact the flow solution but "just" takes the velocity field of the flow to compute dispersion for that passive scalar equation.
I don't have a specifc idea what a transport species is in your case. This must be defined in your solver's manual (as is the above equation type). I would guess this is used for reactive flows, where you have a fluid which consists of different species. A transport species might interact with the flow, but might not react/interact with the other species.

Which one suits your needs would require more knowledge which kind of information/quantity you need to assess.
For example, if you need to compute residence time, you usually would use a (passive) scalar transport equation.

Best,
Sebastian

July 18, 2020, 03:16	scalar source vs species transport	#1
harsha002 New Member harshavardhan Join Date: Nov 2017 Posts: 21 Rep Power: 8	I am working on a car park ventilation project. I would like to know which equation to be used(scalar source or transport species) and would like to know why it is better comparing the other your help is much appreciated

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August 10, 2020, 18:33		#2
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 566 Rep Power: 20	You might need to check whether these terms are synonyms. You likely mean, (Passive) scalar transport equations, do you? In that case such transport equation usually does not impact the flow solution but "just" takes the velocity field of the flow to compute dispersion for that passive scalar equation. I don't have a specifc idea what a transport species is in your case. This must be defined in your solver's manual (as is the above equation type). I would guess this is used for reactive flows, where you have a fluid which consists of different species. A transport species might interact with the flow, but might not react/interact with the other species. Which one suits your needs would require more knowledge which kind of information/quantity you need to assess. For example, if you need to compute residence time, you usually would use a (passive) scalar transport equation. Best, Sebastian