Hello, I am trying to run a simulation with real gas model from NIST using ch4a as working fluid. When I try to initialisate or run the simulation its not converging in Fluent,
in my simulation, inlet temp 110K, 0.02 kg/s ch4, pressure outlet 53 bar. just ıwant to see the phase change, ı try to understand the supercritical fluid, firstly ı tried to fit the curves at MATLAB, but there were wrongs with interpolations. ı reserach the rgp table from nist to CFX, ı couldnt, how do we deal with?
By NIST I assume you mean their REFPROP suite. I am quite familiar with this and many other formulations for thermodynamic properties. If you hope to model phase change of CH4 (methane?) this will not be a simple case of curve fitting with MATLAB. If you hope to use some formulation within Fluent that is an additional obstacle to overcome. I'm not sure you can directly link the NIST tools to Fluent. The properties of supercritical methane are readily available as ASHRAE's R50.
Have you seen this? https://www.researchgate.net/post/Could_anyone_recommend_some_strategies_to_converge_the_solution_while_using_NIST_Real_gas_model_in_Ansys_FLUENT?_ec=topicPostOverviewQuestionRecommendations&_sg=C7a1FzgpOcvurzhXbMGNDibHzeZLMUHdYl4aZwL0pJDUH0OFloicj9VbttyAfZ_0yprBXsKJb_KrGRvj
Dear Dr. Benton, thank you for your answer, yes i see. İt wasn't curve fit i tried at Matlab NIST data
The interesting thing about a Mollier chart (enthalpy vs. entropy): it's the only one with isotherms or isobars that are continuous in value and slope.
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