Junction X is downstream of a choking point

There are two variations of this Caution:

Junction X is downstream of a choking point, static properties cannot be calculated at junction
Junction X is downstream of a choking point, stagnation properties cannot be calculated at junction

This caution only occurs at pressure type junctions (e.g., Assigned Pressure, Tank, Spray Discharge). When sonic choking occurs at a junction with a fixed pressure, there is no way to calculate a velocity downstream of the choke point. This means that it is not possible to determine static conditions if you have specified stagnation pressure at the junction, and vice versa.

For the variation stating that static properties cannot be calculated at the junction, all other results for the model are valid except for the static pressure, static temperature, and static enthalpy at the junction.

For the variation stating that stagnation properties cannot be calculated at the junction, all other results for the model are valid except for the stagnation pressure and stagnation temperature at the junction. Stagnation enthalpy is conserved across the choke point, therefore, it is known at the junction.

Note that Arrow does not model the dynamics of how the flow stream exits into the ambient conditions.