[petsc-users] Hessenberg Index-2 DAE and IMEX

[Tang, Qi]

Hi,

Does PETSc’s ARK directly apply to Hessenberg Index-2 DAE? Do we need to perform a time derivative of the constraint equation by ourselves first?
https://petsc.org/main/docs/manual/ts/#hessenberg-index-2-dae
If we do not have to, do we expect to get high order in time?

Thanks,
Qi



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