sgopal1,

You don't give us too much information to help you out. An attached model or error message could have been useful.

However, assuming you are using components from Modelica.Fluid, since the model fails to solve at t=0 it is probably due to bad initial values. Try to set you initial values better.

BR
Rene Just Nielsen

I thought I had attached the model. But I see that I had not clicked on the "Add attachment to post". Another rookie mistake.



Thanks in advance.

sgopal1,

I made a few modifications to your model (attached). Also see commented code lines in the file.

1) the parameter use_portsData was unspecified. I set it to false (indicating no pressure drop through the tank port(s).
2) I didn't quite understand your initializations in the code. I used the massDynamics/energyDynamics parameters in the System model to initialize the model with a fixed tank level instead
3) with a fixed tank pressure (1 bar) and no pressure drop through the tank port, it's not possible to let the pump control the outlet pressure (since this is already given by the tank model). So I let the pump control the mass flow rate.

You should note that if you run the simulation for long enough time the tank will overflow, causing the simulation to fail. You can avoid this by adding some sort of drain to the tank.

Best regards,
Rene Just Nielsen
Test3-revised.mo

Rene,
Thank you very much for the help.