[zeoffle]

Hello


I'm trying to define liquid property to my simulation that changed temperature and pressure using UDRGM(User-Defined Real Gas Model) in FLUENT.

I read manual and made a code on C++. And code equipped well in FLUENT.

When I set vapor phase, FLUENT calculated vapor state property. But in liquid state, all residuals went divergence and didn't calculate anymore.

In first time, I thought that I typed wrong code, but there were no significance error in code.

Also, I thought that calculation equations had some problem, but in MATLAB, it could calculate property in liquid state.

And someone told me that difficulties in code could affect divergence, So I changed the code simpler, but it didn't work.

At lastly, in FLUENT manual, it can set cell zone state. So, I set the cell zone vapor to liquid. Also, it didn't work.

I searched many times in CFD online and another CFD community, there were no appropriate information related my problem.
And most of the user used UDRGM to define vapor state properties.

I think that I tried all that I have to do it...

So, If someone who tried or defined liquid phase using UDRGM, I want to know how did it.


Thank you

[AlexanderZ]

did you check could you simulate your case file with ideal gas?

show your simplified code