[Nek5000-users] Periodic flow around sphere

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

Fred,

Your other email was too large to make it onto the list.

It appears that the issue is the following -- automatic
timestep selection (i.e., dt > or = 0), doesn't appear to
work with the projection acceleration (param 93, 94, 95 > 0).

So either set param 12 < 0, such that dt = | param 12 |, or
set p93-95 == 0.

I'm pretty certain that will take care of the problem.

(I almost invariably run with dt < 0...)

Paul


On Thu, 22 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:

>
> To be more precise - by nested,  I really meant that there are
> elements that overlap the same regions...  this would be very
> confusing to genmap/nek --- it's one of the cases for which we
> don't currently have any checks (it's not easy in the general
> case... though I think I might now have some ideas on how to
> get at least _some_ type of checking in place)
>
> Paul
>
>
> On Thu, 22 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:
>
>> 
>> Hi Fred, when I view this in postx I get the impression that there
>> are two nested meshes there...  One associated with the sphere, the
>> other looks like a std. periodic box ?  (box first, sphere second)
>> 
>> What tipped me off is that your number of elements is not divisible
>> by 6, and that when I selected to plot face 5, some faces that are
>> not part of the std. spherical mesh configuration showed up.
>> 
>> Checking further...
>> 
>> Paul
>> 
>> 
>> On Thu, 22 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:
>> 
>>> Dear NEKs,
>>> 
>>> I'm trying to compute periodic channel flow around a sphere. The grid I 
>>> made with Prenek (SPHERICAL MESH). But the run is always crashing after 
>>> some timesteps. I tried with different meshes and configurations but it 
>>> never run through...
>>> 
>>> I attached the .rea, .usr, SIZE and output files.
>>> 
>>> Best, Fred
>>> 
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