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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Josh,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don’t have any experience with
Elmer or GiD, but I do have some experience with ANSYS. When we ran into parts
with large aspect ratios, we would try and use 2-D or 1-D elements. The drywall
and studs will predominantly conduct heat in one direction anyways. You can
check this with a quick Biot number calculation. So, if GiD has these type of elements
available I would try using them in concert with your 3-D elements.<o:p></o:p></span></font></p>
<div>
<p><st1:PersonName w:st="on"><font size=2 color=navy face="Times New Roman"><span
style='font-size:10.0pt;color:navy'>Scott Schuetter</span></font></st1:PersonName><br>
<st1:PlaceName w:st="on"><font size=2 color=navy><span style='font-size:10.0pt;
color:navy'>Energy</span></font></st1:PlaceName><font size=2 color=navy><span
style='font-size:10.0pt;color:navy'> <st1:PlaceType w:st="on">Center</st1:PlaceType>
of <st1:place w:st="on"><st1:State w:st="on">Wisconsin</st1:State></st1:place><br>
PH: 608-238-8276 x149<br>
FX: 608-238-0523</span></font><font color=navy><span style='color:navy'> </span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Josh K
[mailto:jeemang@gmail.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, January 18, 2010
5:53 PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] FEA
heat-transfer analysis of envelope designs</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi all;<br>
<br>
I'm interested in using FEA to model the heat-transfer characteristics of
several building envelope designs. I'm attempting to use Elmer (<a
href="http://www.csc.fi/english/pages/elmer">http://www.csc.fi/english/pages/elmer</a>)
to do this. Because Elmer doesn't do anything more than very simple mesh
creation, I'm using GiD (<a href="http://gid.cimne.upc.es/">http://gid.cimne.upc.es/</a>)
to attempt to mesh my wall section.<br>
<br>
However, I'm having some serious problems creating a mesh. I'm not overly
experienced in mesh creation, but I have a feeling this stems from the
ridiculous aspect ratio of several parts of the assembly (ie, a 11' x 6' x
5/8" sheet of drywall) and the relatively minuscule thickness
(~1/16") of the steel studs and z-girts that are in the construction.<br>
<br>
I'm wondering if anyone has conducted any such analysis before and could offer
some meshing tips. Alternatively, can anyone recommend a resource I could
consult?<br>
<br>
Many thanks,<br>
<br>
Josh<br clear=all>
<br>
-- <br>
Josh Kjenner, P.Eng., LEED AP<br>
Manasc Isaac Architects Ltd.<br>
10225 100 Avenue :: <st1:place w:st="on"><st1:City w:st="on">Edmonton</st1:City>,
<st1:State w:st="on">AB</st1:State> <st1:PostalCode w:st="on">T5J 0A1</st1:PostalCode></st1:place><br>
780.429.3977<o:p></o:p></span></font></p>
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