I teach an introductory hydraulics class and for the past few years I have used the "Hydraulic (Isothermal Liquid)" for students to learn hydraulics and learn basic systems. I noticed that the 2020 version introduced "Isothermal Liquid" - will this eventually replace "Hydraulic (Isothermal Liquid)"? I ask because I have started to develop similar hydraulic models and the "Isothermal Liquid" package is less forgiving than "Hydraulic (Isothermal Liquid)". For example, I like to use constant displacement pump sources (as these sources are more realistic than constant pressure sources) and I can't seem to mitigate the errors associated with this block. For instance, I created the "Model an Isothermal Actuator" and it works as described... but when I replace the constant "Pressure Source" with a "Flow Rate Source" (set at constant volumetric displacement) errors are produced and I can't find a way to work around them. If MATLAB is going to phase our "Hydraulic (Isothermal Liquid)" I will need to find ways to work around these errors that appear when the model is replicated in the "Isothermal Liquid" environment. (As an aside, having a pressure relief valve in the "Model an Isothermal Actuator" when there is a constant pressure defeats the purpose. You can remove the relief valve and it doesn't change the operation of the system.)
