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> Trouble with DASSL, Wind turbine simulation
f.perrone
post Mar 17 2011, 12:19 PM
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Hello everyone,

please enclosed you might find the script of my whole work in order to simulate the behavior of a 3 bladed horizontal axis wind turbine.

When I attempt to simulate the model this error command appears:

Log-file of program ./dymosim
(generated: Thu Mar 17 13:11:53 2011)

dymosim started
Model: HAWT_750KW
... "dsin.txt" loading (dymosim input file)
... "HAWT_750KW.mat" creating (simulation result file)

Integration started at T = 0 using integration method DASSL
(DAE multi-step solver (dassl/dasslrt of Petzold modified by Dynasim))

... Error message from dymosim
At time T = 7.832031e-002 and stepsize
H = 2.373564e-015 the code had repeated error test failures
on the last attempted step. A singularity in the solution may be
present. (For DAEs: Provide initial values of X and of XD which
are consistent). Integration will be terminated.

Integration terminated before reaching "StopTime" at T = 0.0783
CPU-time for integration : 0.567 seconds
CPU-time for one GRID interval: 3.61 milli-seconds
Number of result points : 157
Number of GRID points : 158
Number of (successful) steps : 375
Number of F-evaluations : 3510
Number of Jacobian-evaluations: 76
Number of (model) time events : 0
Number of (U) time events : 0
Number of state events : 0
Number of step events : 0
Minimum integration stepsize : 5e-007
Maximum integration stepsize : 0.000436
Maximum integration order : 5
Calling terminal section
... "dsfinal.txt" creating (final states)

Is there anyone able to help me?
I thank you in advance.
Regards,

Francesco

Edit: I worked it out by means of the Radau solver;


Attached File(s)
Attached File  HAWT_750KW.txt ( 11.93k ) Number of downloads: 623
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