[Nek5000-users] mesh problems (i think)

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

So, I solved one of the two problems: I was really stupidly mistaking 
faces and edges...

The other problem, with boundary conditions, still remains: if I create 
a pipe with 0 < z < 1 and assign boundary conditions vz = 1 at z = 0 it 
works fine.
If I create the same pipe, simply translated to have -1 < z < 0 and 
assign boundary conditions vz = 1 at z = -1 it does not work...
This is not a problem for me, I simply translate my geometry, but could 
this be a bug?


Best regards,
Jacopo



On 01/02/2014 11:32, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Josh,
>
> Thank you for the suggestion.
> I was using the format indicated to be used for the reatore2 tool, as
> sugegsted on the webpages for curved elements and boundary conditions.
> Now I have changed it to be exactly the same of that produced by the
> n2to3 tool which I have used to create base3.rea (which is different)
> and made a step forward: now nek reads some more informations from the
> .rea file and gives me the following error when I try to run the case:
>
> WARNING1 Element mesh mismatch at:
> i,j,k,ie:    2    2    6    integer
> Near X =  float float float, d: float float float
>
> for 6 differente integers (2, 5, 8, 11).
>
> The subroutine that produces the error is 'vrdsmsh' but I do not
> understand what the error means....
>
> Best regards,
> Jacopo
>
>
>
> On 31/01/2014 20:10, nek5000-users at lists.mcs.anl.gov wrote:
>> Hi Jacopo,
>>
>> I'm not able to look at your files at this moment, but I do have a quick
>> suggestion.  Nek is normally pretty flexible when it comes to the .rea
>> formatting except for boundary conditions and curve sides.  I would
>> suggest carefully studying the format of the base3.rea file and make
>> sure the formatting you are using to create pipe.rea is the same.
>>
>> - Josh
>>
>>
>> On Fri, Jan 31, 2014 at 11:34 AM, <nek5000-users at lists.mcs.anl.gov
>> <mailto:nek5000-users at lists.mcs.anl.gov>> wrote:
>>
>>     Dear Neks,
>>     I am trying to set up a case from scratch.
>>     The goal is to create a complex 3d cylindrical mesh, to start I am
>>     trying to build a pipe.
>>
>>     1st attempt:
>>     I created a simple 2d 'base.rea' file (by hand) and extruded it with
>>     n2to3 to create 'base3.rea'. This case works in 3d, the outer
>> edges are
>>     curved and the boundary conditions are correct.
>>
>>     2nd attempt:
>>     I wrote a piece of code to create a 3d 'pipe.rea'. I tried to
>> reproduce
>>     the case that I had done by hand but this time without success.
>>     nek runs the case and produces the usual output without giving any
>>     errors but...
>>     Problems:
>>        - the outer edges are not curved
>>        - the boundary conditions are not imposed correctly
>>
>>     In both cases I used the same .usr and SIZE files.
>>
>>     It seemed to me that I had a problem with face numbering, so I tried
>>     changing the number of the curved faces in the pipe.rea file. I tried
>>     with all 6 numbers but still no curved faces.
>>
>>     I have attached both the 'base3.rea' (which works) and the 'pipe.rea'
>>     (which doesn't). I also attached a picture of the output generated
>> when
>>     running the 'pipe.rea' case and the SIZE and .usr files.
>>     All the attached files can be downloaded from my dropbox folder at
>> this
>>     link:
>>     https://dl.dropboxusercontent.com/u/18689429/attachment.zip
>>
>>
>>     Can someone help me understand why 'pipe.rea' does not work?
>>
>>     Best regards,
>>     Jacopo
>>
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>>
>>
>>
>>
>> --
>> Josh Camp
>>
>> "All that is necessary for the triumph of evil is that good men do
>> nothing" -- Edmund Burke
>>
>>
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