[Nek5000-users] Maintaining order of perturbation

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

Hi Paul,

Sorry, I should have written it in more details.

I have the base flow u_{base} calculated, already continuous across the
elements. Now, I am trying to add perturbation doing to the base flow: u =
u_{base}+\epsilon*u_{perturb} at each time-step. \epsilon being the order
(e,g 10^-08) and u_{perturb} varies from 0 to 1 on each grid points.


Best
Sayed

>
> Hi Sayed,
>
> When you say it changed the order, how do you mean?
>
> It should indeed just averaged the interface values, so it
> should be of the same order as the initial perturbation.
>
> Paul
>
>
> On Tue, 14 May 2013, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hi all,
>>
>> I want to add perturbation of specific order (e.g. 10^-08) to the whole
>> velocity field at each time-step. The velocity and pressure are both
>> considered on GLL points. After adding perturbation, to have velocity as
>> continuous function across the elements dsavg() is called (I found the
>> info in one of the threads). I think it changes the order of
>> perturbation
>> near to the element boundary. I was wondering if there is other way to
>> do
>> so.
>>
>> This is my first mail to the group and I am using the code for my
>> thesis.
>>
>> Thanks in advance!
>>
>> Best regards,
>> Sayed
>> MSc. COSSE
>> KTH, Sweden
>> FAU-Erlangen,Germany
>>
>>
>>
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