[Nek5000-users] Question about method & error

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

One striking property of the implemented PN/PN method is that convergence
is ensured for all pairs of approximation spaces. In other words, these spaces do not need be compatible, i.e. they do not need satisfy the LBB condition.

This is in contrast to the implemented PN/PN-2 method. Only compatible spaces for u and p are free of spurious modes.

hth,
Stefan


On Apr 6, 2010, at 12:45 PM, nek5000-users at lists.mcs.anl.gov wrote:

> Hi Frank,
> 
> On Apr 6, 2010, at 12:32 PM, nek5000-users at lists.mcs.anl.gov wrote:
>> Am I correct in understanding that all components of velocity are
>> stored at the same locations (the Gauss–Lobatto–Legendre points), while
>> the pressure is located at the Gauss–Legendre points?  This being in
>> contrast to a MAC type staggered grid, where each velocity component
>> resides at different spatial locations.
>> 
> Yes that's correct!  In NEK two different methods are implemented:
> 
> PN/PN: (v,p) are defined on the GLL points
> PN/PN-2: v is defined on the GLL points and p on the GL points
> 
> 
>> VisIt could not read from the file
>> "/home/fmuldoo/nek5_svn/examples/turbChannel-1/turbChannel0.f0001".
>> 
>> The generated error message was:
>> 
>> There was an error
>> opening /home/fmuldoo/nek5_svn/examples/turbChannel-1/turbChannel0.f0001. It may be an invalid file.  VisIt tried using the following file format readers to open the file: Silo
>> 
>> When using the following metadata file:
>> 
>> NEK5000
>> version: 1.0
>> filetemplate:  turbChannel0.f%04d
>> firsttimestep: 1
>> numtimesteps: 1
> It seems like you're using a wrong filetemplate. Please try again with:
> filetemplate:  turbChannel%01d.f%04d
> 
> 
> #Stefan
> 
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