[Nek5000-users] weak derivative, dssum and binvm1 in cvode_driver

[nek5000-users at lists.mcs.anl.gov]

Dear Nek team,

I have a quick question: in cvode_driver.f, in the routine fcvfun, do all the derivatives must be in weak formulation (using wgradm1) when constructing the right hand side term ydot?
Because at the end of the routine fcvfun,  dssum and multiplication by binvm1 are applied to the right hand side term ydot.

It’s also not clear to me if I need to apply dssum and binvm1 for each derivative term appearing in my equation (in other terms, each time after calling wgradm1), or if I need to apply dssum and binvm1 only to the whole RHS term ydot ?

I’m afraid of inconsistency if apply twice dssum and binvm1: one during the construction of operators and one on the final ydot term.

Thank you for you help !

Best regards,
Emmanuel



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