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# GENERAL¶

Defines options for the General subsurface flow mode.

## Options¶

WINDOW_EPSILON <float>
Specifies the tolerance or window that must be exceeded before phase change will occur.
GAS_COMPONENT_FORMULA_WEIGHT <float>
Specifies the molecular weight of the gas component in grams per mole.
TWO_PHASE_ENERGY_DOF <string>
Specifies the unknown solved for the energy degree of freedom. Options are: AIR_PRESSURE, TEMPERATURE.
ISOTHERMAL
Disables the energy calculation.
NO_AIR
Disables the gas component calculation.
MAXIMUM_PRESSURE_CHANGE <float>
Truncates maximum pressure change in a Newton iteration. (Not to be confused with MAX_PRESSURE_CHANGE in OPTIONS of process model block.)
MAX_ITERATION_BEFORE_DAMPING <integer>
Specifies the threshold number of Newton iterations before damping is imposed.
DAMPING_FACTOR <float>
The scalar value by which the solution is damped once damping is imposed.

## Examples¶

...
PROCESS_MODELS
SUBSURFACE_FLOW flow
MODE GENERAL
OPTIONS
!WINDOW_EPSILON 1.d-4
ISOTHERMAL
TWO_PHASE_ENERGY_DOF TEMPERATURE
GAS_COMPONENT_FORMULA_WEIGHT 2.01588D0 ! kg/kmol
MAXIMUM_PRESSURE_CHANGE 1.0D6 ! truncates pressure change
/
/
/
...