dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Feb 12, 2008 at 10:23:09AM +0100, Dag Lindbo wrote:
> Hello all!
>
> In the stokes demo (taylor-hood), I notice spurious pressure spikes near 
> the corners. What is causing these?
>
> I changed to a paraboloc inflow profile (consistent with the no-slip BCs), 
> but the problem remains. Further, I ran the same problem on a unitsquare 
> mesh (see plot attached). The pressure spikes are large. Is the demo 
> problem ill posed?
>
> Thanks!
> Dag Lindbo, KTH

I would also suspect the boundary conditions for the velocity
to be the problem, but if you still see the spikes with a parabolic
inflow profile (which is zero at the no-slip boundaries) then I have
no idea.

-- 
Anders