[Nek5000-users] Pipe with expansion

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

Hi Paul,

I will try that mapping, I created a straight pipe to do some simulations.

1) Is there a way to check my spectral convergence, so that I can do 
some mesh convergence study?
2) Is there a way to plot the kinetic energy in the flow ?

Thank you,
Kamal



On 15/01/2014 12:14, nek5000-users at lists.mcs.anl.gov wrote:
>
> Hi Kamal,
>
> For the geometry you describe, I would apply mesh morphing
> to a standard straight pipe.  You can create such a pipe
> using a subset of the mkmesh script provided in the expansion
> example.
>
> If your transition region is conical, then I woud make
> certain that the change in slope occurs at element boundaries,
> i.e., as in the half cross-section depicted below:
>
>                               _______________
>                              /|      |      |
>                            /  |      |      |
>                          /|   |      |      |
>        ________________/  |   |      |      |
>        |     |     |   |  |   |      |      |
>        |     |     |   |  |   |      |      |
>        +-----+-----+---+--+---+------+------+---->  z
>
>
> Paul
>
>
>
> On Wed, 15 Jan 2014, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hi Paul,
>>
>> I looked at the example and it looks very helpful, but for a sudden 
>> expansion we have only two parts (i.e) the inlet pipe and the outlet 
>> pipe. Whereas in a diverging pipe we have three section (i.e,) The 
>> inlet pipe, Diverging section and the outlet pipe.
>>
>>
>> Is it possible for me to create a 2D diverging section using mesh 
>> modification and revolve it around the centre axis to get a 3d 
>> diverging pipe ?
>>
>>
>> or should I apply the mesh modification directly to the 3d sudden 
>> expansion pipe using usrdat2() ?
>>
>> Thanks,
>> Kamal
>>
>>
>> On 14/01/2014 21:09, nek5000-users at lists.mcs.anl.gov wrote:
>>> Hi Paul,
>>>
>>> Thanks a lot for the update. I will take a look at as soon as 
>>> possible and keep you updated with it.
>>>
>>> Thank you,
>>>
>>> Kamal
>>>
>>> On Jan 14, 2014, at 9:04 PM, nek5000-users at lists.mcs.anl.gov wrote:
>>>
>>>> Kamal,
>>>>
>>>> I've added an example for a step-type expansion in a pipe. New 
>>>> example directory
>>>> is nek5_svn/examples/expansion, with a README.
>>>>
>>>> If you want a standard diffuser, I would use mesh-morphing, as 
>>>> outlined in the
>>>> nek primer, which can be found on this page:
>>>>
>>>> http://nek5000.mcs.anl.gov/index.php/UG#Documentation
>>>>
>>>> I've also automated our turbulent outflow bc treatment -- one 
>>>> simply provides an
>>>> expansion factor (typically ~ 1.5) and two persistent arrays to 
>>>> turb_outflow(), which
>>>> is now in navier5.f.    This can be useful when very strong 
>>>> vortices are leaving the
>>>> domain, which is possible for certain diffuser flow conditions (and 
>>>> others).
>>>>
>>>> Paul
>>>> ________________________________________
>>>> From: nek5000-users-bounces at lists.mcs.anl.gov 
>>>> [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of 
>>>> nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
>>>> Sent: Monday, January 13, 2014 3:35 AM
>>>> To: nek5000-users at lists.mcs.anl.gov
>>>> Subject: [Nek5000-users] Creating a Mesh
>>>>
>>>> Hi
>>>>
>>>> Can some one please help me in this because I am new to nek
>>>>
>>>> 1) How can I create a .rea for a specific geometry say ' A sudden
>>>> expansion pipe ' or a ' Diverging pipe '
>>>>
>>>> 2) What tool I should use to create that mesh.
>>>>
>>>>
>>>> Thank you
>>>>
>>>>
>>>> kamal
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