[Nek5000-users] Accessing variables

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

The value is 0.0242. I simulated a plunging flat plate in the body  
reference frame. So if uy it was the ''real'' body velocity, I set the  
opposite on the v bcs and wall bc on the body. The ic I set was -uy at  
t=0.
The vy valuss along the flow field are basically set by the boundary  
condition since the plunging frequency is low, so I would expect  
little differences from the magnitude but not a change of the sign.  
Furthermore, what I don't understand is the fact that the post  
processing with the visit values (I'm computing volume integrals of  
the vorticity multiplied vy) is right, while the same integrals on my  
subroutine go wrong.

Mario



Quoting nek5000-users at lists.mcs.anl.gov:

> I consider the values in vy as the "truth", not the values you see  
> in VisIt or Tecplot. What's the magnitude of the values switching  
> their sign?
>
> -----Original message-----
>> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
>> Sent: Monday 23rd October 2017 11:32
>> To: nek5000-users at lists.mcs.anl.gov
>> Subject: [Nek5000-users] Accessing variables
>>
>> I am trying to access local velocity to do some post-processing during
>> execution.
>> If I take as output vy on a given point, I have a result. The same
>> value of vy is given in my output ascii field file.
>> The vy changes the sign but the mangitude is exactly the same when I
>> see the field files on visit.
>> Finally, if I export the field file to tecplot formula, the vy has the
>> same value I see on visit.
>> The problem is that the post-processing works well on tecplot, while
>> on my subroutine in the usr file doesn't work, since not only the vy
>> value is wrong, but it affects also the vorticity computation, that I
>> need.
>>
>> Thanks
>>
>> Mario Ostieri
>>
>> Ph.D. Student
>> University of Naples Federico II
>> Department of Industrial Engineering
>> Piazzale V. Tecchio 80
>> 80125 Napoli, Italy
>> tel. +390817682184
>> email: mario.ostieri at unina.it
>>
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>



Mario Ostieri

Ph.D. Student
University of Naples Federico II
Department of Industrial Engineering
Piazzale V. Tecchio 80
80125 Napoli, Italy
tel. +390817682184
email: mario.ostieri at unina.it