I am learning how to build a thermo-fluid model with Modelica, I notice that in order to reduce the nonlinearity, it is recommended to use two different models: flow model and volume model, here is the explanation I found in a commercial library, but I am not sure how to arrange the equation in the components to realize this idea. So I am looking for some papers and examples about how to use this idea in Modelica coding.
The flow port which indicates that a flow model is directly coupled to it on the inside of the component, i.e. pressure from this port is further processed to compute e.g. mass flow rate. It is recommended to connect this port with a corresponding VolumePort in order to obtain an alternating flow model-volume system model structure. If two models are connected with their ports being both of this class, non-linear equation systems for the algebraic pressure in the ports may be created and require an initial guess value.
