[Trilinos-Users] DAE's in Piro
rppawlo at sandia.gov
Mon Aug 29 09:00:17 MDT 2011
I believe that the Implicit BDF Stepper in rythmos is a reimplementation
of the IDA stepper.
DAE's are handled by the user. When you write your model evaluator, you
assemble the nonlinear equations including the mass matrix, so you can
just leave out the terms that do not have a mass matrix contribution.
During an evaluate call, rythmos will provide time derivatives for all
degrees of freedom, but you are not required to use them all to form the
On 08/28/2011 10:36 PM, Christopher Parmer wrote:
> Hi All,
> I'm moving my model into DAE form and have two quick questions:
> * Is the IDA BDF stepper supported in Piro?
> * How are DAEs handled in Rythmos/Piro. Is there an option for a
> mass matrix? How does outArgs know which residuals are
> differential and which are algebraic?
> (802) 343-5897
> Trilinos-Users mailing list
> Trilinos-Users at software.sandia.gov
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