# FLOW_CONDITION¶

A flow condition can be used to define:

• Spatial distribution of pressure, temperature and saturations.

• Fluid flow injection or production rate

Once defined, the flow condition can be assigned to a portion or the entire reservoir. In a reservoir study, a FLOW_CONDITION that describes a spatial distribution of pressure, temperature and saturations is most commonly used to initialise a study. This can be done in two ways:

FLOW_CONDITION for hydrostatic equilibration:

Or:

FLOW_CONDITION for constant settings:

Note that for a flow condition to be applied to the reservoir (or a portion of it), this must be explicitly used in the INITIAL_CONDITION . It is possible to define multiple flow conditions while using only one of them in the INITIAL_CONDITION card. A condition that defines a fluid flow injection or production rate using source and sink terms, is a simplified way of modeling wells, rarely used in real reservoir studies. This is reported in FLOW_CONDITION for sources and sinks.

FLOW_CONDITION can also define a set of pressure, temperature and saturation values that are applicable to a reservoir boundary (see BOUNDARY_CONDITION). However, these conditions require definition of boundary regions not supported by the GRDECL mesh format, see Special Regions.

For boundary conditions, FLOW_CONDITION can also be used to describe a transient set of pressure, temperature and saturation values, see transient FLOW_CONDITION.