[Nek5000-users] Linearised Navier Stokes

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

Hi Philipp,
I am using the latest version. Thanks for the help. Until I get the
relevant instructions can you please tell me the following:

 Do I have to do separate runs for base and perturbations or the base
state can be incorporated into perturbation run and a single run be
performed.

Thanks
Swarandeep

On Thu, Aug 10, 2017 at 7:42 PM,  <nek5000-users at lists.mcs.anl.gov> wrote:
> Are you using the latest git version? If so, I think I cannot give you the
> procedure as my knowledge is a bit old. But I can ask Adam next week to give
> you these instructions. Sorry about that.
>
> But in general, the buoyancy forcing for the perturbations should go into
> userf as it does for the base-flow calculation.
>
> Or perhaps somebody else could give the guidelines for the new release?
>
> Philipp
>
>
> On 2017-08-10 15:01, nek5000-users at lists.mcs.anl.gov wrote:
>>
>> Hi Philipp,
>>
>>       Can you please outline the procedure to be followed for
>> calculating the perturbed velocity and temperature field based on the
>> following information.
>>
>>      I have a 3d annulus domain with vertical gravity pointing downward
>> and temperature gradient in the radial direction.
>> This leads to a base flow about which I have to linearize the problem.
>> Please let me know how to include the information of the base flow and
>> base temperature gradient into the perturbation calculations.
>>
>> Thank you
>> Swarandeep
>>
>> On Thu, Aug 10, 2017 at 5:51 PM,  <nek5000-users at lists.mcs.anl.gov> wrote:
>>>
>>> Hi,
>>> the linearised version is included in the main version of the code. You
>>> activate perturbations by setting NPERT different from zero. The relevant
>>> routines in the code are collected in the file perturb.f.
>>>
>>> Hope this helps,
>>> philipp
>>>
>>>
>>> On 2017-08-10 12:56, nek5000-users at lists.mcs.anl.gov wrote:
>>>>
>>>>
>>>> Hi Nek Forum,
>>>>
>>>>       How to obtain the linearised version of the Nek5000 code. Please
>>>> advice.
>>>>
>>>> Thanks
>>>>    Swarandeep
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