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chenyao su, Hammond, Glenn E2

12:22 AM

Unexpected Pressure Drop at the Top of the Domain When Chemistry Module Is Enabled in CO₂ Two-Phase Simulation

Chenyao, When supercritical CO₂ and chemistry are combined in your simulation, mineral precipitation

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Unexpected Pressure Drop at the Top of the Domain When Chemistry Module Is Enabled in CO₂ Two-Phase Simulation

Chenyao, When supercritical CO₂ and chemistry are combined in your simulation, mineral precipitation

12:22 AM

sahil wani, Hammond, Glenn E3

Mar 17

Error in Plfotran code

Sahil, Thank you for reporting this bug. I've just pushed a fix for this bug. Please update to

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Error in Plfotran code

Sahil, Thank you for reporting this bug. I've just pushed a fix for this bug. Please update to

Mar 17

Micaela Raviola, Hammond, Glenn E8

Mar 17

Seeking advice on saltwater intrusion modelling with unstructured meshes

Micaela, Because you are operating in GENERAL mode, you can directly simulate salinity tightly

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Seeking advice on saltwater intrusion modelling with unstructured meshes

Micaela, Because you are operating in GENERAL mode, you can directly simulate salinity tightly

Mar 17

Syed Hassan Ahmed, Michael Nole5

Mar 12

SCO2 MODE boundary “Missing dof” error with RATE MASS_RATE

Dear Michael, Thank you again for your guidance earlier. I was able to get the model running, but

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SCO2 MODE boundary “Missing dof” error with RATE MASS_RATE

Dear Michael, Thank you again for your guidance earlier. I was able to get the model running, but

Mar 12

Heeho Park (Pakodot), … Wenyu Zhou6

Mar 10

Transport Questions

Thank you, Peter, for the explanation. On Friday, March 6, 2026 at 10:47:17 AM UTC-7 Wenyu Zhou wrote

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Transport Questions

Thank you, Peter, for the explanation. On Friday, March 6, 2026 at 10:47:17 AM UTC-7 Wenyu Zhou wrote

Mar 10

Bisesh Joshi, Hammond, Glenn E7

Mar 9

O2(g) diffusion inhibiting SOM mineralization in Richards Mode

Hi Glenn, Thank you very much for taking the time to look into this matter and for your helpful

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O2(g) diffusion inhibiting SOM mineralization in Richards Mode

Hi Glenn, Thank you very much for taking the time to look into this matter and for your helpful

Mar 9

Orlando Silva Rojas, Hammond, Glenn E6

Mar 8

Starting a model from separate flow and transport restart files

Hi Glenn Many thanks for your explanation and recommendations. I will look at the links with examples

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Starting a model from separate flow and transport restart files

Hi Glenn Many thanks for your explanation and recommendations. I will look at the links with examples

Mar 8

Hammond, Glenn E

Mar 6

Template Input Files

PFLOTRAN Users, I wanted to let you know that I have created a directory for template input files

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Template Input Files

PFLOTRAN Users, I wanted to let you know that I have created a directory for template input files

Mar 6

Joaquim Tarín Olivares, Hammond, Glenn E2

Mar 5

Question: make Kd value dependent on element concentration

Quim, I've long considered developing a "sorption sandbox" that would allow users to

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Question: make Kd value dependent on element concentration

Quim, I've long considered developing a "sorption sandbox" that would allow users to

Mar 5

Wenyu Zhou, Hammond, Glenn E3

Feb 25

Permeability power and equations mistake in user guide website

Dear Glenn, Thanks for your kind reply! Actually, my major concern is that the porosity-permeability

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Permeability power and equations mistake in user guide website

Dear Glenn, Thanks for your kind reply! Actually, my major concern is that the porosity-permeability

Feb 25

reisi...@gmail.com, Hammond, Glenn E7

Feb 24

Fracture Modeling

Thank you very much Glenn. On Tue, Feb 24, 2026 at 9:00 PM 'Hammond, Glenn E' via pflotran-

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Fracture Modeling

Thank you very much Glenn. On Tue, Feb 24, 2026 at 9:00 PM 'Hammond, Glenn E' via pflotran-

Feb 24

Won Woo Yoon, Hammond, Glenn E4

Feb 23

pH error in OSRT

Won Woo, I apologize for responding earlier. You are correct that the truncation is incorrect for

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pH error in OSRT

Won Woo, I apologize for responding earlier. You are correct that the truncation is incorrect for

Feb 23

Isaac Prud'homme, Peter Lichtner6

Feb 23

Infinite Concentration Error while making a Pyrite Precipitation Model

Could you explain what originally caused the infinite concentration error? I'm interested in

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Infinite Concentration Error while making a Pyrite Precipitation Model

Could you explain what originally caused the infinite concentration error? I'm interested in

Feb 23

Zhongkang Yan, Hammond, Glenn E2

Feb 10

Inquiry on the status and usability of PFLOTRAN particle transport models (straining/blocking) and availability of a latest PDF user manual

Zhongkang, Although this capability is documented in the report below, it is still under development

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Inquiry on the status and usability of PFLOTRAN particle transport models (straining/blocking) and availability of a latest PDF user manual

Zhongkang, Although this capability is documented in the report below, it is still under development

Feb 10

Bisesh Joshi, Hammond, Glenn E2

Feb 5

ERROR: Error with GENERAL_MODE phase boundary condition: Missing dof.

Bisesh, I suspect it is the “recharge” (I prefer MASS_RATE over VOLUMETRIC_RATE for multiphase) or “

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ERROR: Error with GENERAL_MODE phase boundary condition: Missing dof.

Bisesh, I suspect it is the “recharge” (I prefer MASS_RATE over VOLUMETRIC_RATE for multiphase) or “

Feb 5

Bisesh Joshi, Hammond, Glenn E5

Feb 2

Question about multiple boundary at top surface layers

Thanks for your invaluable suggestion, Glenn. I will use seepage BC. On Mon, Feb 2, 2026 at 4:50 PM

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Question about multiple boundary at top surface layers

Thanks for your invaluable suggestion, Glenn. I will use seepage BC. On Mon, Feb 2, 2026 at 4:50 PM

Feb 2

平田光一, Hammond, Glenn E2

Jan 26

Question about Using “RESTART” in PFLOTRAN for Mineral Dissolution

Koichi, You can overwrite the primary species concentrations in the solution vector in the restart

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Question about Using “RESTART” in PFLOTRAN for Mineral Dissolution

Koichi, You can overwrite the primary species concentrations in the solution vector in the restart

Jan 26

Bisesh Joshi, … Sam Shaheen4

Jan 22

Using temperature time-series data for changing microbial rate constant based on Q10 coefficients in PFLOTRAN

Thanks for the response, Glenn. I was looking for a method to incorporate temperature effects on

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Using temperature time-series data for changing microbial rate constant based on Q10 coefficients in PFLOTRAN

Thanks for the response, Glenn. I was looking for a method to incorporate temperature effects on

Jan 22

chenyao su, … Michael Nole7

Jan 18

what is the difference between the MPHASE and SCO2 modes

Thank you very much for the clarification and for taking the time to answer my questions. This was

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what is the difference between the MPHASE and SCO2 modes

Thank you very much for the clarification and for taking the time to answer my questions. This was

Jan 18

Won Woo Yoon, Hammond, Glenn E2

Jan 6

Effect of grid size on diffusion in heterogeneous media

Won Woo, I apologize or the late response. I left on vacation on Dec 13 and returned yesterday. There

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Effect of grid size on diffusion in heterogeneous media

Won Woo, I apologize or the late response. I left on vacation on Dec 13 and returned yesterday. There

Jan 6

Jan 6

On the issue of mode selection for CO2 sequestration simulation

Hello everyone! When I was simulating CO2 geological storage, I found that there are many options for

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On the issue of mode selection for CO2 sequestration simulation

Hello everyone! When I was simulating CO2 geological storage, I found that there are many options for

Jan 6

Anne Schulz, Hammond, Glenn E2

Jan 5

Radiogenic heat production

Anne, See my comments in red below. Glenn From: pflotra...@googlegroups.com <pflotran-users@

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Radiogenic heat production

Anne, See my comments in red below. Glenn From: pflotra...@googlegroups.com <pflotran-users@

Jan 5

Bisesh Joshi, … Hammond, Glenn E12

12/8/25

Model error regarding maximum time step exceeded

Hi Glenn, It worked now. I have restarted computer and have increased the maximum timestep to 10 day.

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Model error regarding maximum time step exceeded

Hi Glenn, It worked now. I have restarted computer and have increased the maximum timestep to 10 day.

12/8/25

Hammond, Glenn E

11/18/25

PFLOTRAN on NERSC

All, For those utilizing PFLOTRAN on NERSC's Perlmutter supercomputer, you have the option to

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PFLOTRAN on NERSC

All, For those utilizing PFLOTRAN on NERSC's Perlmutter supercomputer, you have the option to

11/18/25

Bisesh Joshi, Hammond, Glenn E2

11/13/25

Error in simulation when restarting from h5 file

Bisesh, PFLOTRAN checkpoint files usually end with [*-ts#.h5, *-#.###y.h5, *-restart.h5]. It is

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Error in simulation when restarting from h5 file

Bisesh, PFLOTRAN checkpoint files usually end with [*-ts#.h5, *-#.###y.h5, *-restart.h5]. It is

11/13/25

Hammond, Glenn E, Peter Lichtner2

11/4/25

Reaction Species Finder

It turns out that Ettringite* is in the minskip.dat file which is why it wasn't found! Peter On

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Reaction Species Finder

It turns out that Ettringite* is in the minskip.dat file which is why it wasn't found! Peter On

11/4/25

Bisesh Joshi, Hammond, Glenn E15

11/3/25

Model insensetive when running pflotran from 2000 yr checkpoint file

Thanks for the timely reply, Glenn. I'm trying to simulate the kinetic reaction of the

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Model insensetive when running pflotran from 2000 yr checkpoint file

Thanks for the timely reply, Glenn. I'm trying to simulate the kinetic reaction of the

11/3/25

Hammond, Glenn E, … Girish Kumar6

10/31/25

Re: Simulating headspace for a batch reactor system

When a uniform velocity is imposed on a grid, it is applied to all internal connections as well as

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Re: Simulating headspace for a batch reactor system

When a uniform velocity is imposed on a grid, it is applied to all internal connections as well as

10/31/25

reisi...@gmail.com, Hammond, Glenn E2

10/20/25

Fatemeh, Try increasing the maximum number of time steps using the MAXIMUM_NUMBER_OF_TIMESTEPS card.

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Fatemeh, Try increasing the maximum number of time steps using the MAXIMUM_NUMBER_OF_TIMESTEPS card.

10/20/25

pedram mahzari, Hammond, Glenn E3

10/17/25

Yes. I need to update the development version of the documentation to reference PETSc 3.24. PFLOTRAN

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Yes. I need to update the development version of the documentation to reference PETSc 3.24. PFLOTRAN

10/17/25

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