IBPSA.Fluid.Examples.FlowSystem.Simplified1
Flow system in which the nonlinear system of equation cannot be solved during the time integration.
In Dymola, the model fails to simulate with CVOde 1E-6, but it works if changed to 1E-8. For example, the following command leads to a successful simulation:
simulateModel("IBPSA.Fluid.Examples.FlowSystem.Simplified1",
stopTime=1000, method="Cvode", tolerance=1e-08, resultFile="Simplified1");
This works with Dymola 2024x.
However, see also FlowSystemDymola-2, which has a different commit which uses the pump
model that has in the meantime been updated.
| Model | IBPSA.Fluid.Examples.FlowSystem.Simplified1 |
| Tool | Dymola 2022x |
| OS | Linux Ubuntu 20.04 |
| Status | closed |
| Setup |
git clone git@github.com:ibpsa/modelica-ibpsa.git git checkout dbd21fa5937b262ecd6a6b155a51e5f9edfe3f62 |
| Command |
cd modelica-ibpsa echo "openModel(\"IBPSA/package.mo\", changeDirectory = false);" > run.mos echo "simulateModel(\"IBPSA.Fluid.Examples.FlowSystem.Simplified1\", stopTime=1000, method=\"Cvode\", tolerance=1e-06, resultFile=\"Simplified1\");" >> run.mos echo "exit();" >> run.mos dymola run.mos cat dslog.txt |
| Log message |
Model: IBPSA.Fluid.Examples.FlowSystem.Simplified1 Integration started at 0 using integration method: cvode from sundials Warning: Failed to solve nonlinear system using Newton solver. Time: 12.97929584189059 Tag: simulation.nonlinear[3] For debugging information enable Simulation/Setup/Debug/Nonlinear solver diagnostics/Detailed logging of failed nonlinear solutions. Warning: Failed to solve nonlinear system using Newton solver. Time: 14.0524358164975 Tag: simulation.nonlinear[3] Warning: Failed to solve nonlinear system using Newton solver. Time: 17.85036254174598 Tag: simulation.nonlinear[3] Warning: Failed to solve nonlinear system using Newton solver. Time: 516.3564299944559 Tag: simulation.nonlinear[3] Warning: Failed to solve nonlinear system using Newton solver. Time: 516.0534294555639 Tag: simulation.nonlinear[3] Warning: Failed to solve nonlinear system using Newton solver. Time: 516 Tag: simulation.nonlinear[3] Previous problem occured when evaluating crossing function, reducing step-size cvode: CVODE cvRcheck3 At t = 515.978, the rootfinding routine failed in an unrecoverable manner. Unexpected value: -12 at time 514 Unexpected CVode value Integration terminated unsuccesfully at T = 514 CPU-time for integration : 0.0912421 seconds CPU-time for initialization : 0.000753164 seconds Number of result points : 266 Number of grid points : 258 Number of accepted steps : 351 Number of rejected steps : 4 Number of f-evaluations (dynamics) : 439 Number of non-linear iteration : 410 Number of non-linear convergence failures : 5 Number of Jacobian-evaluations : 12 Number of crossing function evaluations : 619 Number of model time events : 4 Number of state events : 1 Number of step events : 0 Maximum integration order : 5 ERROR: The simulation of IBPSA.Fluid.Examples.FlowSystem.Simplified1 FAILED |
| Discussion | https://github.com/ibpsa/modelica-challenge-problems/discussions/4 |