Opened 14 years ago
Last modified 12 years ago
#1455 closed defect (fixed)
initial_residual() equations are created with removed Vars -> initialization problems — at Initial Version
| Reported by: | Willi Braun | Owned by: | Willi Braun |
|---|---|---|---|
| Priority: | blocker | Milestone: | |
| Component: | Backend | Version: | trunk |
| Keywords: | Cc: | Willi Braun, Frenkel, TUD, Lennart Ochel |
Description
The initial_residual() equations are created in some cases with already removed equations.
This can produce some really strange errors, while the simulation.
One of them ist the following:
{{{"Error in initialization. Solver iterated 50000 times without
finding a solution".}}}
Or in some case the following occurs:
{{{Error solving linear system of equations (no. 2458) at time 0.000000, system is singular.
Error solving linear system of equations (no. 2458) at time 0.000000, system is singular.
DASSL-- TOUT (=R1) TOO CLOSE TO T (=R2) TO START INTEGRATION
In above, R1 = .5000000000000E+00 R2 = .0000000000000E+00
DDASRT: The code has encountered trouble from which it cannot recover.}}}
The Dassl message especially is really quite strange.
I think we need a restructure of the BackendDAE.DAE record to split the Vars not only in Known and Unknown Variables. More in removedVars, states, parameters, free parameters and maybe some more.
