Hi,
I've got strange results with my overall model, even though the isolated
classes seem to work reasonably while testing. Basically I'd like to
simulate a hydraulic circuit, with a pump flow changing in time and
subsequent flow resistances.
I reduced the problem to the following 3 primitive classes:
connector Port
Real pressure;
flow Real flowrate;
end Port;
model Pipe
Port port;
parameter Real a = 1;
equation
port.pressure = port.flowrate * a;
end Pipe;
model Pump
Port port;
equation
port.flowrate = -( time - port.pressure);
end Pump;
//------------------------------
model Test
Pump pu;
Pipe pi;
equation
connect(pu.port,pi.port);
end Test;
// simulate(Test);
Probably I've some severe misconceptions about coupling of the
components because the model does not reproduce the analytical solution:
pi.flowrate = time/(1+a)
Results are basically constant (except for the time variable). There is
only a step change at the last time step!?
Where am I wrong? Without your help, I'm totally stuck now! (I'm using
version 1.4.4 of OM.)
Dieter
--
Best wishes
H. Dieter Wilhelm
Darmstadt, Germany
