id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2996	This very simple circuit fails	massimo ceraolo	Karim Adbdelhak	"I came across in a circuit that fails to simulate with OM r23316.
I've simplified it as much as possible.
The final version, that I enclose (test.mo), contains a very few components and does not simulate.
It should be ok and simulates well in Dymola.
Any further simplification produces a circuit that OM can simulate.

Since it is rather simple, maybe by analysing this it is possible to find some OM weakness that can be fixed.

Error message:

[:0:0-0:0] Error: Internal error Transformation Module sort components failed!
[c:/dev/OpenModelica/Compiler/BackEnd/BackendDAETransform.mo:114:7-115:62] Error: Internal error function strongComponentsScalar failed
- sorting equations (strongComponents) failed
[c:/dev/OpenModelica/Compiler/BackEnd/BackendDAETransform.mo:468:9-468:92] Error: Internal error function analyseStrongComponentBlock failed
[:0:0-0:0] Error: When solving linear system 
1 : (-Lf2.i) - rDn.i - dcCap.i = 0.0
2 : rDn.i + Lf.i - rUp.i = 0.0
3 : dcCap.i + rUp.i - Lf1.i = 0.0
[
  -1.0 , 0.0 , -1.0 ;
  0.0 , -1.0 , 1.0 ;
  1.0 , 1.0 , 0.0
]
  *
[
  dcCap.i ;
  rUp.i ;
  rDn.i
]
  =
[
  Lf2.i ;
  -Lf.i ;
  Lf1.i
]
  U(3,3) = 0.0, which means system is singular for variable rDn.i."	defect	closed	normal	Future	Backend	trunk	fixed