Opened 9 years ago

Last modified 7 years ago

#3785 closed defect

Large differences in back-end and simcode time with FluidDissipation test cases — at Version 1

Reported by: Francesco Casella Owned by: Lennart Ochel
Priority: high Milestone:
Component: Backend Version:
Keywords: Cc: Vitalij Ruge

Description (last modified by Francesco Casella)

Very similar test models using the Modelica.Fluid.Dissipation library take back-end times which are orders of magnitude different.

Consider, e.g., ​https://test.openmodelica.org/libraries/history/ModelicaTest_trunk-2016-03-21.html

ModelicaTest.Fluid.Dissipation.TestCases.PressureLoss.Bend: 253s
ModelicaTest.Fluid.Dissipation.TestCases.PressureLoss.Orifice: 0.13s

ModelicaTest.Fluid.Dissipation.Verifications.HeatTransfer.Channel.kc_evenGapLaminar: 0.06s
ModelicaTest.Fluid.Dissipation.Verifications.HeatTransfer.Channel.kc_evenGapLaminar_KC: 1.75s

ModelicaTest.Fluid.Dissipation.Verifications.HeatTransfer.HelicalPipe.kc_turbulent: 0.063s
ModelicaTest.Fluid.Dissipation.Verifications.HeatTransfer.HelicalPipe.kc_turbulent_KC: 8s

SimCode times also vary similarly.

I suspect analytical Jacobians might be involved. In any case, it seems that the *_KC tests are really taking too much time.

Change History (1)

comment:1 by Francesco Casella, 9 years ago

Description: modified (diff)
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