ODE15S problem with solver

2012 8 28
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I try to solve a stiff non-linear ODE including a time-dependent term with ode15s (and I tried others too) using mass matrix. Matlab starts computing but then displays a warning and aborts:
Warning: Failure at t=4.691305e-05. Unable to meet integration tolerances
without reducing the step size below the smallest value allowed
(1.084202e-19) at time t.
Does anybody have an idea how to avoid this?
Thanks!

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Lucas García
Lucas García 2012-8-28

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Have you tried with all the different stiff solvers available? ode15s, ode23s, ode23t and ode23tb. It could be that the problem you are trying to solve is too stiff for a solver but can be solved with another.
Also, it can be a singularity issue. Maybe this technical solution can help:
http://www.mathworks.com/support/solutions/en/data/1-192Z0

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Christian Lenz
Christian Lenz 2012-8-28
Thank you, Lucas. Yes, I tried them. But none seems to work out-of-the-box... I tried to tune parameters. It seems that the time-dependent term is very critical as soon as it changes fast, the solver aborts with the above warning.

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