[Nek5000-users] Linearised Navier Stokes
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Fri Aug 18 07:40:39 CDT 2017
Hi Adam,
Thank you for the continued support. I managed to get the base flow
and then I used it in a perturbation calculation following the dfh_cav
case. Peculiarly, I an finding that the basic state is getting time stepped
and the perturbations are not (in contrast to the dfh_cav case). I have
used the same .par file from the dfh_cav case and has used the follwoing
settings:
[PROBLEMTYPE]
perturbations = yes
solveBaseflow = no
variableProperties = yes
Can you please let me know where I am am mistaken.
Swarandeep
On Fri, Aug 18, 2017 at 4:52 PM, <nek5000-users at lists.mcs.anl.gov> wrote:
> Hi,
>
> ###.ma2 is the binary version of ###.map file and you need only one of
> them (it is a new feature). The map (or ma2) is generated by travis during
> testing by running genmap, so we do not keep it in repository.
> regards
> adam
>
>
> On 18/08/17 10:49, nek5000-users at lists.mcs.anl.gov wrote:
>
> Hi
> I could no find the ###.ma2 file for the dfh_cav example. Hence I
> suppose I require the ###.box or the ###.map file to proceed for the base
> flow. Please correct me if I have misunderstood.
>
> Swarandeep
>
> On Fri, Aug 18, 2017 at 1:03 AM, <nek5000-users at lists.mcs.anl.gov> wrote:
>
>> Hi Swarandeep,
>>
>> For computing the base flow you can use the same mesh and map file. What
>> you need to change is 1) the boundary conditions such that they are valid
>> for the base flow and 2) the flags that you run a nonlinear instead of a
>> linear case.
>>
>> As Clio was saying, in that particular case the base flow was computed
>> using a Newton method. For lower Rayleigh numbers, you should however be
>> able to just run (nonlinear) DNS to reach the steady state.
>>
>> Best regards,
>> Philipp
>>
>> On 2017-08-17 20:23, nek5000-users at lists.mcs.anl.gov wrote:
>>
>>> Hi Clio and Adam,
>>>
>>> Thanks for the information.
>>>
>>> I think in order to compute the base flow I need the ###.box file as
>>> well as a different ###.usr file as I think the boundary and initial
>>> conditions for the ###.usr file in the short_tests/dfh_cav directory is
>>> applicable for the perturbations only. Please send me the ###.box and the
>>> corresponding ###.usr file applicable for the base flow for dfh_cav case.
>>>
>>> Swarandeep
>>>
>>>
>>> On Thu, Aug 17, 2017 at 7:03 PM, <nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov>> wrote:
>>>
>>> Hi Swarandeep,
>>>
>>> The baseflow has been computed with a Newton solver (which is not
>>> available in the nek examples). The additional code had been
>>> implemented in the version 1040 of nek5000, and there is no .par
>>> file for that. However, in general, if your case is laminar, to
>>> compute a baseflow, you just need to evaluate the steady state of
>>> your nonlinear case. For that, you can use the same .par file, and
>>> just change to the nonlinear solver (perturbationmodes = 0,
>>> perturbations = no, solveBaseflow = yes).
>>>
>>> The non dimensionalization is based on Hellums and Churchill (1962).
>>>
>>> The equations are:
>>>
>>> Pr (du/dt + (U*nabla)u + (u*nabla)U) = 1/sqrt(Ra)laplacian(u) -grad
>>> p + e_g theta
>>> d theta/dt + (u*nabla)Theta + (U*nabla)theta =
>>> 1/sqrt(Ra)laplacian(theta)
>>> div(u)=0
>>>
>>> where u, theta are respectively the velocity and temperature of the
>>> perturbation, U, Theta the velocity and temperature of the baseflow.
>>>
>>> You can find more information in the paper "Saglietti, Clio, et al.
>>> "Adjoint optimization of natural convection problems: differentially
>>> heated cavity." Theoretical and Computational Fluid Dynamics (2016):
>>> 1-17." on which the example is based.
>>>
>>> Regards,
>>>
>>> clio
>>>
>>>
>>> Quoting nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov>:
>>>
>>> Hi Adam,
>>>
>>> Thanks for the clarification. Can you please send me a sample
>>> .par file for
>>> the baseflow for the case of "dfh_cav". Also is it possible to
>>> get the
>>> equations solved for this problem(dfh_cav). I would like to know
>>> the way
>>> that this has been made dimensionless.
>>>
>>> For your kind information I briefly describe my case which I
>>> have been used
>>> to solve with the regular non-linear framework using older
>>> versions (.rea
>>> files). My setup is as follows:
>>> Geometry is a 3D cylindrical annullus.
>>> Temperature are fixed at inner and outer cylinders.
>>> Gravity is acting in -z direction
>>> There is a back ground rotation which is constant.
>>>
>>> Please let me know if any other info is required. Thanks for the
>>> help.
>>>
>>> Swarandeep
>>>
>>>
>>>
>>>
>>> On Thu, Aug 17, 2017 at 1:48 PM,
>>> <nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov>> wrote:
>>>
>>> Hi Swarandeep,
>>>
>>> Yes. You generate ###.rea in the standard way. In the old
>>> version it was
>>> txt and contained both mesh information and runtime
>>> parameter. One could
>>> split mesh information (###.re2, binary file) and runtime
>>> parameters
>>> (###.rea with negative number of elements or currently
>>> ###.par) using
>>> reatore2 tool. The map file is generated with genmap (can be
>>> txt or
>>> binary). So the procedure is more or less the same. If you
>>> have ###.rea
>>> with mesh you split it and generate ###.re2. Next you
>>> generate ###.map with
>>> genmap and finally ###.par by hand. Be careful to use tolls
>>> from the same
>>> release, as they've been changed significantly (e.g. binary
>>> ###.map file).
>>> Regards
>>> Adam
>>>
>>>
>>> On 16/08/17 18:52, nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov> wrote:
>>>
>>> Hi Adam,
>>>
>>> Thank you very much for the help.
>>>
>>> Does the ###.map, ###.box file and from them the
>>> ###.rea file
>>> (in the dfh_cav case: the ###.re2 files) are created as
>>> done for the
>>> earlier versions i.e., by using genbox and genmap. Please
>>> clarify.
>>>
>>> Swarandeep
>>>
>>>
>>>
>>> On Wed, Aug 16, 2017 at 5:35 PM,
>>> <nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov>> wrote:
>>>
>>> Hi,
>>>
>>> The simplest way would be to look into existing example
>>> under
>>> Nek5000/short_test/dfh_cav/
>>> It is a differentially heated cavity case and covers
>>> both direct and
>>> adjoint linear solver. It is compatible with the current
>>> git version and
>>> uses ###.par file instead of ###.rea.
>>> Regards
>>> Adam
>>>
>>>
>>>
>>>
>>>
>>> On 11/08/17 11:05, nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov> wrote:
>>>
>>> This information might be outdated (old version) but
>>> previously the base
>>> flow was read in using the restart option in the rea
>>> file. The disturbance
>>> you can read in yourself in userchk.
>>>
>>> Philipp
>>>
>>> On 2017-08-11 10:49, nek5000-users at lists.mcs.anl.gov
>>> <mailto:nek5000-users at lists.mcs.anl.gov> wrote:
>>>
>>> Hi Philipp,
>>>
>>> That was very much helpful. I have a
>>> steady base flow and
>>> temperature state. Please let me know where to
>>> provide the base flow.
>>>
>>>
>>> Thank you
>>> Swarandeep
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