[Nek5000-users] E INVALID BC FOUND in genfast

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

Michael, Shriram,

. ierr is set to the element that has a problem

. ierrmx is the maximum of ierr, taken over all processors.

If more than one element has a problem, you won't know
it because it will only flag the element having the largest
number -- thus indicating that there is _a_ problem, but not
the extent of the problem.  (Flagging errors is tricky when
you have millions of elements.)

My general approach at this point would be something like the
following.

Suppose the troublesome element is 3192.

Add the following code to the gen_fast routine:

       mid = gllnid(3192)
       ie  = gllel (3192)
       if (mid.eq.nid) write(6,6) mid,ie,(cbc(k,ie,1),k=1,6)
    6  format(2i8,6('.',a3,'.'),' BOUNDARY')

when you then run the code and grep for BOUNDARY in the logfile
you should see something like:

      20  5  .v  ..E  ..E  ..E  ..E  ..E  .

and not (say)

      20  5  .v  .. E .. E .. E .. E .. E .


It's imperative that the BCs are 3 characters each and that
the spaces are in the correct place.

Only by printing the bcs can you see what bcs are really being
passed to the code.

Paul




On Wed, 30 Jun 2010, nek5000-users at lists.mcs.anl.gov wrote:

>
>
> Hi Paul,
>
>
>
> I am also getting something similar, however it is referring to many elements with
>
> Â a "BC fail" and then gives the E INVALID BC FOUND. I have attached the case
>
> and output log for referrence.
>
>
>
> I checked the elements that it is referring to and the BC's are good, so I'm not sure
>
> why it tells me this. I looked in fast3d.f and also couldn't figure out what "ierr and ierrmx"
>
> refer to. Could explain what this error means or what it is checking for? Thanks
>
> for any help!
>
>
>
> - Michael
>
> Â 
> ----- Original Message -----
> From: nek5000-users at lists.mcs.anl.gov
> To: nek5000-users at lists.mcs.anl.gov
> Sent: Friday, June 25, 2010 1:39:43 PM GMT -06:00 US/Canada Central
> Subject: Re: [Nek5000-users] E INVALID BC FOUND in genfast
>
>
> Shriram,
>
> It's indicating that one of the bcs for element 3912 is not valid.
>
> What are those?
>
> Paul
>
>
> On Fri, 25 Jun 2010, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hi all,
>>
>> I am getting the following error when I try to run nek :
>>
>> Â  *0 Â  Â  Â  Â 3912 Â BC FAIL*
>> *EXIT: E INVALID BC FOUND in genfast       3912*
>>
>> *
>> *
>> I grep-ed to the source code to get an idea of what the error actually
>> means, but I couldn't comprehend whats going on in the code (fast3d.f) .
>> Could anybody tell me what this error actually means ? I checked the
>> Boundary condition of the particular element (3912) and everything seems to
>> be OK.
>> Thanks for any help.
>>
>> Regards
>> Shriram Jagannathan
>>
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