Isentropic expansion process in steam engine

[khalchris khalchris]

I am trying to simulate a steam engine cycle and currenlty I am only trying to simulate the isentropic process of the steam engine (isentropic expansion) on a T-S diagram which is a striaght vertical line , I am using a piston cylinder-crankslider mehcanism that moves with the insert of the steam at high temperature and pressure as inital conditions at some inital volume and the crank slider will move a 180 degrees when the piston moves from TDC to BDC, I have designed the crankslider mehcanism on simulink and it is working fine but when i attach the thermodynamic blocks into the system i dont get any realistic results and only errors and inncorrect diagrams,
For steam properties i am using a library named water95 to get the temperature , pressure ,density and entropy values each time the simulation is running , i hope anyone can take a look at my deisgn and tell me where i went wrong .