[Nek5000-users] genmap error: infinite loop, not connected, in rec_bisect

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

Hi Paul, 



Could you provide some insight into this problem with the periodic bondary condition as described below?  This error occurs when running genmap. 



Thanks, 

Michael 


----- Original Message ----- 
From: nek5000-users at lists.mcs.anl.gov 
To: nek5000-users at lists.mcs.anl.gov 
Sent: Tuesday, June 29, 2010 1:59:13 PM GMT -06:00 US/Canada Central 
Subject: Re: [Nek5000-users] Periodic Mismatch 1 


Hi, 

I was able to solve this by removing the element face count column. 

I now run into the following issue shown below.  I was able to find the subroutine spec_bis_conn where this error occurs. 
I believe this has to do with the periodic faces I have set up. My question is whether the periodic faces need to be continuous: 

For example, the geometry is similar to fluid flow over a flat plate on both sides. The fluid is periodic, but separated by the solid 
thickness (this is a Conj HT problem). Essentially there is a "gap" in the periodic fluid portion if you can imagine.  I saw a note in 
  the routine that says something like "ensure that all graphs are connected", not sure if this is what it means.  I tried making the fluid 
periodic on only one side of the plate and it worked, however when I make the other side (bottom of the plate) periodic with itself 
I get the following error. Any thoughts?  Thanks - Michael M. 

start rec_bisect:        2006 
 done:    0.0% 
 done:    1.0% 
 done:    2.0% 
 done:    3.0% 
 infinite loop 
 not connected           1          63           1           0 
 not connected           1          32           2           0 
 not connected           1          16           3           0 
 not connected           1           8           4           0 
 not connected           1           4           5           0 
 done:    4.0% 
 not connected          13          31           6           0 
Segmentation fault (core dumped) 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/nek5000-users/attachments/20100701/b8ceb434/attachment.html>