[Nek5000-users] Pipe with expansion

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

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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