CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

How does Fluent calculate the specific enthalpy for incomp. ideal gas?

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   October 7, 2022, 06:08
Post How does Fluent calculate the specific enthalpy for incomp. ideal gas?
New Member
Join Date: Jun 2022
Posts: 1
Rep Power: 0
brunolago is on a distinguished road
Dear Users,

I am currently doing a CFD simulation in Ansys and was trying to grasp the energy equation that Fluent solves. In the Theory Guide 15.0, chapter, it is stated that for ideal gas, the specific enthalpy of a mixture is calculated through equation 5.3, whereas with an incompressible flow, it is calculated through equation 5.4.

What equation does Fluent use when the density of a mixture is calculated through incompressible ideal gas? I understand that if this density calculation option is checked, then the flow is treated as incompressible through pressure changes. Does this mean that equation 5.4 is used, as Fluent treats the flow as incompressible?

Also, if someone knows - why do the equations differ (5.3&5.4) in the way that they do? Is there some derivation which I can look up?

Thanks for the help and sorry if this has already been asked before, I genuinely tried looking this up to no avail.
brunolago is offline   Reply With Quote


ideal gas, incompressible flow, incompressible ideal gas, sensible enthalpy

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How does fluent calculate the total enthalpy? bap FLUENT 0 June 22, 2016 10:55
Ideal gas v.s. Real gas for wing simulation Anna Tian Main CFD Forum 1 December 16, 2013 11:39
Polynomial coefficients for specific heat of Ideal gas avi031 Main CFD Forum 0 November 11, 2011 00:28
Two-Phase Buoyant Flow Issue Miguel Baritto CFX 4 August 31, 2006 12:02
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02

All times are GMT -4. The time now is 20:44.