[Nek5000-users] Volume integral time derivative vorticity

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

another way would be to just compute the vorticity at the previous time, 
and store it. Regarding the integration, I would suggest that you define 
a mask function (based on coordinate values) which is 0 and 1 depending 
on whether you are outside/inside of the integration domain (potentially 
with some smoothing), and then multiply your vorticity before 
multiplying with bm1 and summing.

Philipp

On 2017-09-19 19:42, nek5000-users at lists.mcs.anl.gov wrote:
> You'll find the previous velocity in the vxlag array. Integration is easy, just multiply by bm1 and sum up. The tricky part might be to identify your sub-domain i.e. the elements.
> 
> -----Original message-----
>> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
>> Sent: Tuesday 19th September 2017 18:46
>> To: nek5000-users at lists.mcs.anl.gov	 <nek5000-users at lists.mcs.anl.gov>
>> Subject: [Nek5000-users] Volume integral time derivative vorticity
>>
>> I performed some simulations around a plunging flat plate.
>> I have to compute the volume integral over a choosen domain (a rectangle around the body with a fixed geometrical dimension) of the eulerian time derivative of the vorticity field multiplied by the local position vector components. I found a subroutine to compute the vorticity. How should I compute vorticity at the previous timestep? And how can I perform the integrations?
>>
>> Thanks
>> Mario
>>
>> 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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