How to use GEMS to calculate thermodynamic properties of multicomponent fluids

[forsterite]

I would like to use the GEMS3 gui to calculate fluid properties using the Churakov and Gottschalk equation of state, which the documentation indicates is possible. What are the required steps to calculate, say, the volume of a pure H2 fluid at 423 K and 700 MPa? I’ve looked through the help, but it’s not clear to me where to start. Will GEMS calculate the equilibrium speciation of a multicomponent fluid of a fixed composition, pressure, and temperature by Gibbs energy minimization, based on the chosen equation of state?

[gdmiron]

Hello @forsterite, I am trying to locate the test project for the Churakov and Gottschalk equation of state which you could use as an example. Until I have it working try using the TestPR "test project PRSV fuild" from the example projects in the GEMS modeling projects selection window (also a multi component fluid model).

If you open the project you can do calculations or use it as a template for a different new project where you can used the PRSV model. I you go in the database mode you can see how the fluid model is defined what options are chosen by clinking the wrench remake button, or on page 2 of the phase definition you have the table with parameters.

Phase remake window after clicking the red wrench button with phase setup options

[gdmiron]

@forsterite in the latest version of GEMS 3.11.0 you have the project "TestCG" which contains the implementation of the Churakov and Gottschalk equation of state, GEMS3.11.0\Gems3-app\Resources\projects - you can copy it to your uses projects folder in Library if not already there. If you go in the database mode and click on Phases on the fluid phase you will see its setup.

You can also open the project and give it different compositions to calculate. The CG model will be used.