The internal source takes power out of the system to the left, and feeds it into the system to the right. The modulation signal is used to set the flow of the inflow. The flow of the outflow is computed such that power in equals power out.
The internal flow source is primarily used in the computation of convective flows, when entropy flow has to accompany mass flow.
The modulated internal flow source has two causality strokes.
Potential variables: e1: Bondgraphic effort variable of inflow f1: Bondgraphic flow variable of inflow, normalized positive for flows into the model e2: Bondgraphic effort variable of outflow f2: Bondgraphic flow variable of outflow, normalized positive for flows out of the model s: Modulation input signal
Equations:
f1 = s
f2 = f1*(e1/e2)