Cvode regression

[arun3688]

Related Issues

https://test.openmodelica.org/jenkins/blue/organizations/jenkins/OpenModelica/detail/PR-15120/4/tests/

Purpose

Fix regression caused by commits

95ff321 (#1521)

Causes

After the above two commits, Regression happened if CVode has larger stepSize defined in modelDescription.xml, see the below lua script

oms_setCommandLineOption("--suppressPath=true")
oms_setTempDirectory("./Pendulum-lua/")
oms_newModel("model")
oms_addSystem("model.root", oms_system_sc)
oms_addSubModel("model.root.A", "../resources/Modelica.Mechanics.MultiBody.Examples.Elementary.Pendulum.fmu")
initialStepSize = 0.01
minimumStepSize = 0.01
maximumStepSize = 0.01
oms_setVariableStepSize("model", initialStepSize, minimumStepSize, maximumStepSize);
oms_setResultFile("model", "pendulum_res.mat")
oms_instantiate("model")
oms_initialize("model")
oms_simulate("model")
oms_terminate("model")
oms_delete("model")

output

# ../../install/bin/OMSimulator Pendulum.lua
info:    maximum step size for 'model.root': 0.010000
info:    Result file: pendulum_res.mat (bufferSize=1)
info:    Parameter model.root.A.world.label1 will not be stored in the result file, because the signal type is not supported
info:    Parameter model.root.A.world.label2 will not be stored in the result file, because the signal type is not supported

[CVODE ERROR]  CVode
  At t = 0 and h = 0.01, the error test failed repeatedly or with |h| = hmin.

error:   [doStepCVODE] SUNDIALS_ERROR: CVode() failed with flag = -3
warning: Bad return code at time 0.000000
info:    Final Statistics for 'model.root':
         NumSteps = 0 NumRhsEvals  = 3 NumLinSolvSetups = 1
         NumNonlinSolvIters = 2 NumNonlinSolvConvFails = 0 NumErrTestFails = 1
info:    1 warnings
info:    1 errors

However if you reduce to a smaller StepSize for example (0.0001) then it works fine. But this should not happen and the fmu should run with larger stepSize as well.