Error: Variable ID 8 not supported for the process model: NULL_FLOW

[瀧本一斗]

Dear PFLOTRAN developers,

I am currently developing a PFLOTRAN model and encountered the following error message during execution:

"ERROR: Variable ID 8 not supported for the process model: NULL_FLOW. Please look at variables.F90 to match this integer ID with a variable parameter constant."

The purpose of the simulation is to evaluate reactive tracer transport in a 3D domain that includes a synthetic fracture. The domain is a rectangular box (1.0 x 0.5 x 0.1 meters), and the fracture is explicitly represented as a high-permeability slit running from x = 0.4 m to x = 0.6 m across the entire Y-Z plane. The surrounding matrix is impermeable. The goal is to simulate fluid and tracer flow through the fracture and observe water-rock interactions, such as the neutralization reaction between H⁺ and OH⁻.

To implement this, I defined two material properties: one for the impermeable background (1e-20 m² permeability), and one for the slit (1e-12 m² permeability). I initially used `SPECIFIED_VELOCITY` to drive the flow in the X-direction. In the output section, I attempted to write variables such as `VELOCITY_AT_CENTER`.

I suspect that the error is due to not enabling a flow model explicitly, and thus PFLOTRAN treats the problem as "NULL_FLOW", making flow-related variables unsupported. I would appreciate your advice on how to correctly structure this input, or any clarification on using output variables in such a configuration.

I have attached the input file (`fracture_test.in`) for your reference.

Thank you very much in advance.

Best regards,  
Izuto

[Hammond, Glenn E]

Izuto,

 

For me, your input deck runs with no issues. Which version of PFLOTRAN are you using? What is the output from the command:

 

git log -1

 

executed within the PFLOTRAN repository?

 

Thanks,

 

Glenn

 

From: '瀧本一斗' via pflotran-dev <pflotr...@googlegroups.com>
Date: Monday, March 24, 2025 at 2:29 AM
To: pflotr...@googlegroups.com <pflotr...@googlegroups.com>
Subject: [pflotran-dev: 6316] Error: Variable ID 8 not supported for the process model: NULL_FLOW

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