[Nek5000-users] solver tolerances and norm of residual
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Tue Nov 16 14:14:03 CST 2010
Sorry - that's a check that we should add... It's now on my
todo list.
Paul
On Tue, 16 Nov 2010, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Paul,
>
> it worked!!
>
> The crucial difference between my file and yours was:
>
> < parameter (lz2=lz1-2)
>> parameter (lz2=lz1 )
>
> I am a little ashamed for not having seen it but the output was not giving
> me any clue.
>
> Thank you so much.
>
>>
>> Hi Alex,
>>
>> I just tried your case - it ran w/o any difficulty.
>>
>> I wonder if there is an issue w/ your SIZE file? I've
>> placed the one that I used in
>>
>> www.mcs.anl.gov/~fischer/SIZE
>>
>> which you can just grab. Then makenek 3dtest followed by
>> the usual run process.... Let me know if this resolves the
>> issue for you.
>>
>> Cheers,
>>
>> Paul F.
>>
>>
>> On Tue, 16 Nov 2010, nek5000-users at lists.mcs.anl.gov wrote:
>>
>>> Hi,
>>>
>>> I think this is not the reason because in a previous attempt to face the
>>> 3D problems I tried to solve the 3D lid-driven cavity (no periodic BC)
>>> and
>>> I obtained the same error: NaN in Helholtz residual.
>>>
>>> Maybe I should start from the turbChannel example and simplify the
>>> problem
>>> to reach a laminar 3D poiseuille flow.
>>>
>>> Anyway, thanks a lot for your answers.
>>>
>>>> A quick look of the *rea file did not bring up anything. I recall an
>>>> issue with periodic BC's, following is an email from one of the
>>>> developers:
>>>>
>>>>
>>>> Hi Frank,
>>>>
>>>> Yes -- we currently don't support periodic bcs for
>>>> anything smaller than a 3 x 3 x 3 array of elements.
>>>>
>>>> There's a technical reason for this --- it can be
>>>> circumvented if really needed, but it would not
>>>> fit within the std. context.
>>>>
>>>> Sorry about that.
>>>>
>>>> Paul
>>>>
>>>> On Tue, 2010-11-16 at 12:56 -0500, nek5000-users at lists.mcs.anl.gov
>>>> wrote:
>>>>> Hi Frank,
>>>>>
>>>>> The rea file has been attached.
>>>>> Meanwhile I'll check the BC...
>>>>>
>>>>> Thanks
>>>>>
>>>>>> Hello Alex,
>>>>>>
>>>>>> I looked through your files & didn't see anything amiss (by the way,
>>>>> it
>>>>>> would be best to post your *.rea file). Since it blows up on the
>>>>> first
>>>>>> attempt to solve for pressure, perhaps the BC's don't satisfy
>>>>>> conservation of mass?
>>>>>>
>>>>>> Cheers,
>>>>>> Frank
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Tue, 2010-11-16 at 11:40 -0500, nek5000-users at lists.mcs.anl.gov
>>>>>> wrote:
>>>>>>
>>>>>>> Hi Nek users,
>>>>>>>
>>>>>>> I am new in using Nek5. I have succesfully simualted the lid-driven
>>>>>>> flow,
>>>>>>> rayleigh-bénard in a square cavity and laminar poiseuille flow.
>>>>> All of
>>>>>>> them were 2d cases. I though it would be straightforward to move
>>>>>>> from
>>>>> 2D
>>>>>>> to 3D simualtions but I have not been able to run a 3D poiseuille
>>>>>>> channel.
>>>>>>> I am obtaining an error on Helmoltz solver even in the first
>>>>> iteration.
>>>>>>>
>>>>>>> Please, find output, usr and box files attached.
>>>>>>> Thanks in advance.
>>>>>>>
>>>>>>> ..........................................
>>>>>>> Alex Fabregat
>>>>>>> Post-doctoral fellow
>>>>>>> University of Ottawa
>>>>>>> Department of Mechanical Engineering
>>>>>>> _______________________________________________
>>>>>>> Nek5000-users mailing list
>>>>>>> Nek5000-users at lists.mcs.anl.gov
>>>>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>>>>>
>>>>>> --
>>>>>> Frank Herbert Muldoon, Ph.D. Mechanical Engineering
>>>>>> Technische Universität Wien (Vienna University of Technology)
>>>>>> Inst. f. Strömungsmechanik und Wärmeübertragung (Institute
>>>>>> of
>>>>> Fluid
>>>>>> Mechanics and Heat Transfer)
>>>>>> Resselgasse 3
>>>>>> 1040 Wien
>>>>>> Tel: +4315880132232
>>>>>> Fax: +4315880132299
>>>>>> Cell:+436765203470
>>>>>> fmuldoo (skype)
>>>>>> http://tetra.fluid.tuwien.ac.at/fmuldoo/public_html/webpage/frank-muldoon.html
>>>>>> _______________________________________________
>>>>>> Nek5000-users mailing list
>>>>>> Nek5000-users at lists.mcs.anl.gov
>>>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>>>>>
>>>>>
>>>>>
>>>>> ..........................................
>>>>> Alex Fabregat
>>>>> Post-doctoral fellow
>>>>> University of Ottawa
>>>>> Department of Mechanical Engineering
>>>>> _______________________________________________
>>>>> Nek5000-users mailing list
>>>>> Nek5000-users at lists.mcs.anl.gov
>>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>>> --
>>>> Frank Herbert Muldoon, Ph.D. Mechanical Engineering
>>>> Technische Universität Wien (Vienna University of Technology)
>>>> Inst. f. Strömungsmechanik und Wärmeübertragung (Institute of Fluid
>>>> Mechanics and Heat Transfer)
>>>> Resselgasse 3
>>>> 1040 Wien
>>>> Tel: +4315880132232
>>>> Fax: +4315880132299
>>>> Cell:+436765203470
>>>> fmuldoo (skype)
>>>> http://tetra.fluid.tuwien.ac.at/fmuldoo/public_html/webpage/frank-muldoon.html
>>>>
>>>> _______________________________________________
>>>> Nek5000-users mailing list
>>>> Nek5000-users at lists.mcs.anl.gov
>>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>>>
>>>
>>>
>>> ..........................................
>>> Alex Fabregat
>>> Post-doctoral fellow
>>> University of Ottawa
>>> Department of Mechanical Engineering
>>>
>>> _______________________________________________
>>> Nek5000-users mailing list
>>> Nek5000-users at lists.mcs.anl.gov
>>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>> _______________________________________________
>> Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>
>
>
> ..........................................
> Alex Fabregat
> Post-doctoral fellow
> University of Ottawa
> Department of Mechanical Engineering
>
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>
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