PRES

A simple perfect gas monitored volume where the relative pressure is a function of relative volume or a function of time.

In the PRES monitored volume, the relative pressure is defined as P_rel = pressure inside of monitored volume - atmospheric pressure.

The relative pressure is defined using a function in one of two ways. By default, the relative pressure is defined as a function of the relative volume $P_{r e l} (\frac{V_{0}}{V})$ $P_{r e l} (\frac{V_{0}}{V})$ , or the pressure can be a function of time $P_{r e l} (t)$ $P_{r e l} (t)$ .