Dear all,
I have some remarks on the interactive simulation. I use the two tank
example provide with OpenModelica 1.6.0 for windows. I use windows XP
operating system.
First, whith your client when you change parameter value at a specified time
step, 3.6s for example. The output values are available only at 7 s,
associated client output data below.
Server recieved message: result#2.8#tank1.h=0.132#source.flowLevel=0.02#end
End delay of 3 seconds.
Enter operation to be sent to server:
Message to be send: changevalue#5#3.6#source.flowLevel=0.0004#end
Enter operation to be sent to server:
Command to delay the client for: 10 seconds.
Server recieved message: done#5#end
Server recieved message:
result#7#tank1.h=0.13752#source.flowLevel=0.0004#end
Server recieved message:
result#7.8#tank1.h=0.13768#source.flowLevel=0.0004#end
Server recieved message:
result#8#tank1.h=0.13776#source.flowLevel=0.0004#end
Server recieved message:
result#8.2#tank1.h=0.13784#source.flowLevel=0.0004#end
Server recieved message:
result#8.4#tank1.h=0.13792#source.flowLevel=0.0004#end
Secondly,I launched a long simulation. I have a computation divergence after
239 computation step. The computation sends the following message:
Message send: done#5#end
DASSL-- TOUT (=R1) TOO CLOSE TO T (=R2) TO START INTEGRATION
In above, R1 = .4800000000010E+02 R2 = .4800000000010E+02
DDASRT: The code has encountered trouble from which it cannot recover.
DDASRT: The code has encountered trouble from which it cannot recover.
Error, simulation stopped at time: 48 with idid: -33
Result written to file.
omi_Calculation: error occurred while calculating
If I change the computation time step to 0.5s the computation diverges after
256 computation steps.
I have done test with other model and the divergence arrive after 240
computation time steps.
More over, I can not use dassl2 or euler computation method in interactive
simulation. The computation time is not increased.
Regards
Hervé FERAL
Ingénieur électro-thermique
