SimScape Gas simulation error

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Federico Avino
Federico Avino 2021-3-4
回答： Juan Sagarduy 2021-3-16
Hi, I'm working to a simscape project, and the results of the simulations were fine (no warnings, no errors, physical results accurate and control logics accomplished) till yesterday. Today I opened the project, I executed it without applying any modifications in the model parameters nor in the simulator parameters, and I riceived the following warnings:
First solve for initial conditions failed to converge. Trying again with all high priorities relaxed to low.
Component:Simulink | Category:Model warning
Second solve for initial conditions failed to converge. Trying again with all variable targets ignored.
Component:Simulink | Category:Model warning
Unable to satisfy all initial conditions. The variables involved are listed below.
The following variables' targets could not be honored:
'Tank_1.T_I' (Temperature of gas volume)
'Tank_1.p_I' (Pressure of gas volume)
'Tank_2.T_I' (Temperature of gas volume)
'Tank_2.p_I' (Pressure of gas volume)
'Tank_3.T_I' (Temperature of gas volume)
'Tank_3.p_I' (Pressure of gas volume)
'Tank_4.T_I' (Temperature of gas volume)
'Tank_4.p_I' (Pressure of gas volume)
'Tank_5.T_I' (Temperature of gas volume)
'Tank_5.p_I' (Pressure of gas volume)
'Tank_6.T_I' (Temperature of gas volume)
'Tank_6.p_I' (Pressure of gas volume)
'Tank_9.T_I' (Temperature of gas volume)
'Tank_9.p_I' (Pressure of gas volume)
Those are pressures and temperatures of the tanks in my plant.
As a consequence, the simulation doesn't run because of simulation errors. The fact is that I didn't modify anything. Between the two runs I didn't even use my PC.
If I try to modify slightly the initial conditions the simulation runs, but way faster than before and it gives an error after a few seconds.
Does anyone have ever experienced something like this? And how did you manage?
Thank you a lot

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Juan Sagarduy
Juan Sagarduy 2021-3-16
Hello Federico
Debugging such model is often difficult, and various settings may affect. My recommendation would be to reach MathWorks technical support and share the files as well.
Br Juan

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