<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'><DIV style="FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 12pt">
<DIV style="FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 12pt">
<P>Hi Paul,</P>
<P> </P>
<P>We tried a few simple geometries with the new midpoint feature and did have </P>
<P>some success, however we are also experiencing a new learning curve with the </P>
<P>feature and thought you could shine some light on it.</P>
<P> </P>
<P>We tried with only one element and have been successful. We then tried with </P>
<P>many elements, including all midpoints in the curved side section, and we </P>
<P>received the "vanishing jacobian" error. Next, we tried removing from the curved </P>
<P>side section; internal edges. So, any midpoints on edges that were "interior" to the </P>
<P>geometry. My best way to explain this would be midpoints which lie on edges that</P>
<P> do not see a boundary (meaning the edge is shared by elements on all sides.) This</P>
<P> left us with only midpoints on the outer surface of the geometry, which we were able </P>
<P>to deform quite nicely. However, we did reach a threshold at which point </P>
<P>we got the "vanishing jacobian" again. </P>
<P> </P>
<P>So this brings up two questions:</P>
<P> </P>
<P>1. Is there no support for internal edges, meaning only midpoints on the surface </P>
<P>of the geometry can be deformed? (If so, I think that is not an issue but good</P>
<P>information to have).</P>
<P> </P>
<P>2. Is there a threshold distance from the midpoint to the undeformed edge for it </P>
<P>to work? Markus ran a case where the following worked:</P>
<P> </P>
<P>10 1 0.75000 -0.090000 0.750000 0.00000 0.00000 m<BR> 9 3 0.75000 -0.090000 0.750000 0.00000 0.00000 m</P>
<P> </P>
<P>But, below did not. <BR><BR>10 1 0.75000 -0.100000 0.750000 0.00000 0.00000 m<BR> 9 3 0.75000 -0.100000 0.750000 0.00000 0.00000 m</P>
<P> </P>
<P>Thanks for any insight you can provide with this and the new feature!</P>
<P> </P>
<P>Regards,</P>
<P>Michael<BR><BR>----- Original Message -----<BR>From: nek5000-users@lists.mcs.anl.gov<BR>To: nek5000-users@lists.mcs.anl.gov<BR>Sent: Monday, April 5, 2010 10:17:21 PM GMT -06:00 US/Canada Central<BR>Subject: Re: [Nek5000-users] Representing Curved Side in any plane<BR><BR></P>
<STYLE>p { margin: 0; }</STYLE>
<DIV style="FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 12pt">
<P>Hey Paul,</P>
<P> </P>
<P>Sounds great! And I think this is exactly what we needed! We will try it tomorrow.</P>
<P> </P>
<P>Thanks again,</P>
<P>Michael</P>
<P><BR>----- Original Message -----<BR>From: nek5000-users@lists.mcs.anl.gov<BR>To: nek5000-users@lists.mcs.anl.gov<BR>Sent: Monday, April 5, 2010 9:29:33 PM GMT -06:00 US/Canada Central<BR>Subject: Re: [Nek5000-users] Representing Curved Side in any plane<BR><BR>Hi, I've just added the midside-node support to the current svn repo for nek. </P>
<P> </P>
<P>Sorry - I thought I had upgraded this in October but apparently had not committed to </P>
<P>the repo then. Hopefully all should work -- I retested my original benchmark w/ this new </P>
<P>version and it is functioning. Please let me know if this now works for you. </P>
<P>You should be able to modify any one of the 12 edges. </P>
<P> </P>
<P>Paul </P></DIV><BR>_______________________________________________ Nek5000-users mailing list Nek5000-users@lists.mcs.anl.gov https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users </DIV></DIV></div></body></html>