Dynamic Surface Area

[Noah McMullan]

Hi Glenn,

I see in the current PFLOTRAN documentation that the dynamic surface area calculation is based on the initial volume fraction of a mineral. I was scrolling through the Google Groups and saw that you were working on an alternative to be used for dynamic surface area calculations for minerals that begin at VF of 0. I was wondering if you ever completed this update, or if dynamic surface area is still only applicable to minerals with VF>0?

Best,

Noah McMullan

[Hammond, Glenn E]

Yes. This is implemented where the surface is a function of the specific surface area and the mineral volume fraction.  See SURFACE_AREA_FUNCTION card at

https://documentation.pflotran.org/user_guide/cards/subsurface/chemistry/mineral_kinetics_card.html#mineral-kinetics-card

For an example, see Dolomite in the following regression test:

https://bitbucket.org/pflotran/pflotran/src/cabbdeaa2daeb2e349f67e765a7321d333673a9f/regression_tests/default/batch/nucleation/dolomite_precipitation.in#lines-69

You can also ‘grep -R SURFACE_AREA_FUNCTION | grep MINERAL_MASS’ in PFLOTRAN_DIR/regression_tests

Glenn

From: pflotra...@googlegroups.com <pflotra...@googlegroups.com> on behalf of Noah McMullan <noahmcm...@gmail.com>
Date: Sunday, July 26, 2026 at 6:51 PM
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Subject: [pflotran-users: 8824] Dynamic Surface Area

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[Noah McMullan]

Thank you!