Constraint-CONCENTRATIONS

[reisi...@gmail.com]

Hi Glenn,

I noticed that under Concentration, the term G is "concentration based on equilibrium with a gas (partial pressure) [bars]"

However, in one of the examples in the following link,  I came across this line: "HCO3- -3.5 G CO2(g)"

https://documentation.pflotran.org/user_guide/how_to/benchmark.html

If it refers to partial pressure, I’m confused as to how it can have a negative value?

Best regards,
Fatemeh

[Hammond, Glenn E]

Negatives values for gas partial pressure under constraints is a hidden capability. When the value is less than or equal to zero, the number is interpreted base 10 log form of the number:

https://bitbucket.org/pflotran/pflotran/src/866a287741531b60cec7220f421346f441583243/src/pflotran/reaction.F90#lines-1614

 

Glenn

 

From: pflotra...@googlegroups.com <pflotra...@googlegroups.com> on behalf of reisi...@gmail.com <reisi...@gmail.com>
Date: Tuesday, June 10, 2025 at 6:16 PM
To: pflotran-users <pflotra...@googlegroups.com>
Subject: [pflotran-users: 8426] Constraint-CONCENTRATIONS

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[Fatemeh]

Thank you very much for the information!

To view this discussion visit https://groups.google.com/d/msgid/pflotran-users/PH0PR09MB7836D2FBF817F3BD01A09DDF9A75A%40PH0PR09MB7836.namprd09.prod.outlook.com.