FlowPort connector defines an acausal interface
for transporting both fluid volume, pressure and dissolved drug
concentration between components.
flow VolumeFlowRate qv
Instantaneous volumetric flow rate (e.g., l/min or m^3/s).
Positive qv indicates flow into the component.
stream MassConcentration c
Mass concentration of the transported substance (e.g., mg/l or kg/m³). This is a stream variable, so when ports are connected, the modeling tool will mix concentrations according to the actual flow directions. Additionally, when a circular connection using flowport is made, then a GroundConcentration component should be connected somewhere in the circle.