relationship of density with pressure and temperature in Fluent

ehsan1986 · August 25, 2017, 06:21

Hi all,

Can someone provide me with a reference which shows the relationship of density with pressure and temperature, and is embedded in Fluent?

Many thanks,
Ehsan

Kirill-MIPT · August 25, 2017, 08:05

Hello! Dependence of density on pressure and temperature is called equation of state. There is a number of such equations in fluent

What do you need it for?

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ehsan1986 · August 25, 2017, 08:42

I need to reference to it in a research paper. I am modelling a multi-phase turbulence flow using VOF and k-epsilon models.

CeesH · August 25, 2017, 09:10

it depends on how you set it.
The default materials typically have constant density and constant temperature (energy equation off), they will not be affected by the local values of your pressure.

These things are only influenced if you explicitly set them to be. So, if you want to include that in your research paper, make sure you also enabled the relevant options in the software!

Kirill-MIPT · August 25, 2017, 16:11

So you conducted a research via fluent. Why don't you just refer to the equation of state that you used in the research? Isn't that enough? If not, the first thing that comes to mind is setting proper values of pressure and temperature at the inlet and initializing the field, so you get the value of density under certain conditions

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August 25, 2017, 06:21	relationship of density with pressure and temperature in Fluent	#1
ehsan1986 New Member ehsan Join Date: Apr 2012 Location: UK Posts: 14 Rep Power: 14	Hi all, Can someone provide me with a reference which shows the relationship of density with pressure and temperature, and is embedded in Fluent? Many thanks, Ehsan

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August 25, 2017, 08:05		#2
Kirill-MIPT Member Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10	Hello! Dependence of density on pressure and temperature is called equation of state. There is a number of such equations in fluent What do you need it for? Sent from my Redmi Note 3 using CFD Online Forum mobile app

August 25, 2017, 08:42		#3
ehsan1986 New Member ehsan Join Date: Apr 2012 Location: UK Posts: 14 Rep Power: 14	I need to reference to it in a research paper. I am modelling a multi-phase turbulence flow using VOF and k-epsilon models.

August 25, 2017, 09:10		#4
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	it depends on how you set it. The default materials typically have constant density and constant temperature (energy equation off), they will not be affected by the local values of your pressure. These things are only influenced if you explicitly set them to be. So, if you want to include that in your research paper, make sure you also enabled the relevant options in the software!

August 25, 2017, 16:11		#5
Kirill-MIPT Member Kirill Borodin Join Date: Mar 2016 Posts: 60 Rep Power: 10	So you conducted a research via fluent. Why don't you just refer to the equation of state that you used in the research? Isn't that enough? If not, the first thing that comes to mind is setting proper values of pressure and temperature at the inlet and initializing the field, so you get the value of density under certain conditions Sent from my Redmi Note 3 using CFD Online Forum mobile app