Testing the tee branch components
 Basic test:

model for join case (similar for split case)

comparison of tee branch models

used for fine tuning of parameters in TeeBranch

split case
 dynamic pressure increase
 use substitutional pipes with negative
length
 Adding one pipe to the pressure source:

large pressure oscillations due to bad initial values

choosing better start pressure → amplitude decreases
 Adding one pipe to the mass flow source:

simulation stops with an error

Newton solver can't find initial values

giving reasonable initial values manually doesn't help

only TeeBranch works (with positive pipe length)
 Homotopy initialisation:

start with a simplified model to find initial values

change model continuously to target model

possible with Modelicas homotopy function

works for many thermofluid models

doesn't work here (so far?)