Tank Volume

FluidFlow doesn't consider tank volume. If we build a model with a tank/reservoir node (see below), the software takes account of the surface pressure defined at the tank as well as the liquid level and pipe/branch connection height defined from the base of the tank. Note, to set the pipe/branch connection height from the base of the tank, select the "Connections" row on the Input tab as shown below:     So essentially, for an inlet boundary, we can define either the flow rate or pressure.