OK,

One question regarding the statement about switching boundary conditions...
How so?

BoundaryValuesU is unchanged from the tutorial and directly
integrating eliminates the need for a BC on velocity so I should still
be aligned with the tutorial and the system described earlier in the
tutorial. Maybe this is my problem that my assumption is incorrect?


Anyways thanks for the correspondence.


Matt


On Sun, 31 Jul 2022 at 17:44, Wolfgang Bangerth <[email protected]>
wrote:

> On 7/30/22 21:15, Matthew Rich wrote:
> >
> > However, I am not sure how to slowly morph the Step 23 tutorial into
> what I
> > want to do. The different time integration approach is like swapping an
> engine
> > from a car.
>
> But you also switched the boundary conditions.
>
>
> > You have to commit and hope the car starts at the end. My car will
> > not turn over. I was hoping there was an obvious error in what I am
> doing
> > since the solution being just zero is pretty stark.
>
> Sorry, you'll have to debug this yourself I'm afraid :-( We don't have the
> resources to do this for all of our users.
>
> Best
>   W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth          email:                 [email protected]
>                             www: http://www.math.colostate.edu/~bangerth/
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