id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
3785	Large differences in back-end and simcode time with FluidDissipation test cases	Francesco Casella	Lennart Ochel	"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: 0.86s
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."	defect	new	high	1.10.0	Backend