[SamEngD]

Hi all. I would like to simulate supercritical CO2 in Fluent and have properties from NIST REFPROP. My question is how do I input these properties into Fluent and can I use the DPM for SC02?

Many thanks,
Sam

[LuckyTran]

Fluent has refprop built in, just activate the NIST real gas model

[SamEngD]

Thanks for the information, I was already aware that the real gas model is built in but as far as I am aware that does not allow any changes to be made. I have REFPROP so can make changes to temperature and pressure which results in changes to the thermodynamic and transport properties. There is also the other part of my question, I am simulating SCO2 through a nozzle and also dust particles created elsewhere in the model. I am trying to understand how I should model this and whether to simulate both using discrete phase method.

[LuckyTran]

Fluent has refprop built in

[SamEngD]

Please could you expand on "Fluent has REFPROP built in"

Anyone's input is greatly appreciated. I have seen a few posts requesting advice on modelling SCO2

I am already aware that the REFPROP (NIST real gas model) is built in but as far as I am aware that does not allow any changes to be made. I have REFPROP 10, so can make changes to temperature and pressure in the program externally, which results in changes to the thermodynamic and transport properties.

There is also the other part of my question, I am simulating SCO2 through a nozzle and also dust particles created elsewhere in the model. I am trying to understand how I should model this and whether to simulate both using discrete phase method. According to the information I have found DPM seems like the correct approach.

Information provided from ANSYS 12 users guide 8.16.2 The NIST Real Gas Models have these been updated at all

The following limitations exist for the NIST real gas model:

Access to the Create/Edit Materials dialog box from the navigation pane or Define menu is restricted. Therefore, if solid properties have to be set and modified, then it should be done in the Create/Edit Materials dialog box before activating the real gas model.

The NIST real gas model assumes that the fluid you will be using in your ANSYS FLUENT computation is superheated vapor, supercritical fluid, or liquid. Note that subcritical flow conditions, where vapor coexists with liquid in two-phase flow, are not supported. In addition, all fluid zones must contain the real gas; you cannot include a real gas and another fluid in the same problem.

Pressure-inlet, mass flow-inlet, and pressure-outlet are the only inflow and outflow boundaries available for use with the real gas models.

Non-reflecting boundary conditions should not be used with the real gas models.
The mixture flow does not permit chemical reactions with the NIST real gas model.

The real gas models cannot be used with any of the multiphase models. The model is compatible with the Lagrangian Dispersed Phase Models only for the massless and inert particle types. Please note that particle material properties have to be set in the Create/Edit Materials dialog box before activating the real gas model.

You cannot modify material properties in the REFPROP database libraries, or add custom materials to the NIST real gas model.

[LuckyTran]

Can you elaborate on what changes need to be made to Fluent? Because the refprop in Fluent executes the exact same binaries as when you use refprop. What means changing temperature and pressure? Of course you retrieve properties at different conditions. Do you think refprop in Fluent returns properties at a single given temperature and pressure? That's not how it works.