Hi Adam,
I mean the physical meanings of the degrees of freedom / independent variables that make up your solution vector. In the compositional case, they usually depend on the local phase state. If all phases are present, they are typically one phase pressure and the saturations of the remaining phases. If a phase vanishes, the corresponding saturation can't be used as primary variable and is often replaced by something describing the composition of another phase, such as a mass fraction.
Does this clarify what is meant with the term?
Kind regards
Bernd
Original Message:
Sent: 02-28-2024 11:34 AM
From: Adam Turner
Subject: Template for questionnaire available
Hello Bernd,
Could you please elaborate on what is expected under "Primary variables"?
Regards,
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Adam Turner
Reservoir Engineer
RPS Energy
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