On Tue, 22 Jun 2010, Brian Templeton wrote:

> I am trying to get example 18 to "work." It is outputting without
> error to exodusII now that I downloaded the latest files from the
> repository. However, as far as I can tell all of the outputted files
> are approximately the same. I've tried messing with the Reynolds
> number (by default it is set to 0) as well changing the time step
> (including to large values trying to get instability in order see
> something evolve).

Large time steps just approach the steady-state problem, which for the
default EulerSolver (backward Euler) has a fixed stable solution for
low Re.

> I'm going to keep playing with it. However, the webpage mentions the
> example uses experimental routines

Mostly that experimental warning is there because the API may still be
in flux; we had to refactor it in a non-backwards-compatible way early
last year and might have to do so again.

> so I thought I'd ask if the example works

But partly that experimental warning is there because we're working
on some new features under the hood, and even the API-compatible
changes might break things from time to time.  The FEMSystem stuff is
working fine on my own examples, but you're right, it's as if it's
just solving the steady problem on ex18.  I'll check it out.

Thanks,
---
Roy

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