Learning Forum

[Weon Shik Han]

Hi, I used aungier-redlich-kwong equation of state to represent the choked flow (supersonic flow) of gas phase CO2 in converging-diverging nozzle. 

Here, how the sound speed is calculated in ANSYS? 

The website regarding the explanations about aungier-redlich-kwong equation of state only contains the calculation methods except sound speed and Cv (isochoric specific heat).

(The website:  https://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node335.htm) 

As I know, sound speed in real-gas-model can be calculated as c = 1/sqrt(partial rho / partial p)_s, where c is sound speed, rho is density, p is pressure, and s represents the isentropic process. 

Here, how can I export (partial rho / partial p) and Cv (isochoric specific heat) in fluent?

 

Thanks in advance. 

[Nilay Pedram]

Hello,
For real gases, no need to get the derivatives to get the speed of sound as you can get the information from post-processing (under contour or other instances). For Cv, you can probably get it using UDFs. 
Hope this helps. Thanks!