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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dear COMIS users, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>An increasing number of users contact me about numerical
problems running coupled simulations (using COMIS as a TYPE in TRNSYS). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>It appears that a good deal of these problems is
simply due to an unfortunate default value used in the graphical environment of
COMIS: the default solver used for COMIS by Simulation Studio is solver 1 (<st1:City
w:st="on"><st1:place w:st="on">Newton</st1:place></st1:City>). This is a good
choice for stand-alone COMIS projects. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>For coupled projects, however, solver 6 (trust region
line search) is more appropriate. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>So if you encounter problems running coupled
projects, you should just try to <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>change the solver in the
COMIS (*.cpf) project (Assembly/Control cards/Control tab, select “<st1:metricconverter
ProductID="6”" w:st="on">6”</st1:metricconverter> under “Solver
selector)<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>re-write the COMIS input
file (.cif) from the COMIS project (Calculate/Create Input file)<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial'><span
style='mso-list:Ignore'>-<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>Re-run the TRNSYS (.tpf)
project<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<div>
<p><b><font size=2 face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
font-weight:bold'>Werner Keilholz</span></font></b><b><font face=Verdana><span
style='font-family:Verdana;font-weight:bold'><br>
</span></font></b><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>TIDS / IIL / Ingénieur</span></font><font
size=1><span style='font-size:7.5pt'><o:p></o:p></span></font></p>
<p><b><font size=3 color="#0000a1" face=Verdana><span style='font-size:12.0pt;
font-family:Verdana;color:#0000A1;font-weight:bold'>Centre Scientifique et
Technique du Bâtiment<br>
</span></font></b><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>84 avenue Jean Jaurès - Champs-sur-Marne - <st1:phone
o:ls="trans" w:st="on">77447</st1:phone> Marne-la-Vallée Cedex 2<br>
Tél : 04 <st1:phone o:ls="trans" w:st="on">93 95 67 46</st1:phone><br>
Fax : <st1:phone o:ls="trans" w:st="on">04 93 95 67 33</st1:phone><br>
Port : <st1:phone o:ls="trans" w:st="on">06 82 93 32 36</st1:phone></span></font><o:p></o:p></p>
<p><b><font size=2 color="#008100" face=Verdana><span style='font-size:10.0pt;
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