Real Gas

Lilo · March 20, 2018, 16:34

In ansys-Fluent when i choose a correlation for real gas such as soave or Peng Robinson i have to select energy balance or not isnt neccesary?
Ill appreciate your help

PayarRadfar · March 20, 2018, 23:03

Quote:

Originally Posted by Lilo

In ansys-Fluent when i choose a correlation for real gas such as soave or Peng Robinson i have to select energy balance or not isnt neccesary?
Ill appreciate your help

Hi Lilo,

Whenever you choose a specific characteristic in Ansys Fluent (18.2 I work with and I am sure about) It Automatically turns on the energy method (or any other Method it needs) and will let you know that in the command section.
ie. When you choose ideal gas because it involves Temperature of the gas it turns it on.

Alternatively, you can read the manual; Theory section and user manual and will give you information on that.

Lilo · March 21, 2018, 09:22

Thanks for reply me.

In this case,no matter whether an isothermal system?

Lilo · March 21, 2018, 09:23

Quote:

Originally Posted by PayarRadfar

Hi Lilo,

Whenever you choose a specific characteristic in Ansys Fluent (18.2 I work with and I am sure about) It Automatically turns on the energy method (or any other Method it needs) and will let you know that in the command section.
ie. When you choose ideal gas because it involves Temperature of the gas it turns it on.

Alternatively, you can read the manual; Theory section and user manual and will give you information on that.

Thans for reply me

No matter whether an isothermal system?

PayarRadfar · March 23, 2018, 03:04

Quote:

Originally Posted by Lilo

Thans for reply me

No matter whether an isothermal system?

Yes becaeuse the ideal gas fluid for example is a function of temperature. Thats how it finds the density change. You can read more on the theory and user manual of ansys fluent.

No worries

LuckyTran · March 23, 2018, 13:39

If your system is isothermal, you can use the fixed values option in cell zone conditions to keep the temperature the same everywhere.

Just so you know, you can also specify the initial temperature field and disable the solution of the energy equation. To do this in the GUI go to solution controls and click Equations... This isn't the same as fixing the temperature constant but it demonstrates that there is a difference between specifying your EOS and solving the physics.

March 20, 2018, 16:34	Real Gas	#1
Lilo New Member Liliana Join Date: Mar 2018 Posts: 3 Rep Power: 8	In ansys-Fluent when i choose a correlation for real gas such as soave or Peng Robinson i have to select energy balance or not isnt neccesary? Ill appreciate your help

March 21, 2018, 09:22	Isothermal system	#3
Lilo New Member Liliana Join Date: Mar 2018 Posts: 3 Rep Power: 8	Thanks for reply me. In this case,no matter whether an isothermal system?

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March 23, 2018, 13:39		#6
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,667 Rep Power: 65	If your system is isothermal, you can use the fixed values option in cell zone conditions to keep the temperature the same everywhere. Just so you know, you can also specify the initial temperature field and disable the solution of the energy equation. To do this in the GUI go to solution controls and click Equations... This isn't the same as fixing the temperature constant but it demonstrates that there is a difference between specifying your EOS and solving the physics.