Configuring the model

To run mesas.py the user must provide some information about how the model is to be configured. First, at least one SAS function must be specified. In addition you may wish to provide information about solutes to be transported through the system, and/or modify the default model options.

The recommended way of providing configuration data is in a text file formatted using the JSON standard. Typically this file is called something like config.json. The contents look very much like a python dict, with some differences. A minimal example of a configuration file is a text file containing the following text:

{
"sas_specs":{
    "Flux out":{
        "SAS fun":{
            "ST": [0, 100]
            }
        }
    }
}

This specifies a single uniform SAS function between 0 and 100 associated with the flux named "Flux out".

mesas.py looks for three top-level entries in the file:

• "sas_specs": spcification of the SAS functions (see Specifying SAS functions)

• "solute_parameters": information about solutes to be transported through the system (see Specifying solute parameters)

• "options": optional arguments for customizing the model run (see Optional parameters)

For more information click the links above. Here is an example of the contents of a config.json file that uses all three of these top-level fields.

{
"sas_specs":{
    "Flux out":{
        "SAS fun":{
            "ST": [0, 100]
            }
        }
    }

"solute_parameters":{
    "solute A":{
        "C_old": 0.5
        }
    }

"options":{
    "dt": 3600
    }
}