<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.5730.11" name=GENERATOR></HEAD> <BODY> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2>Hi Giulio,</FONT></SPAN></DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2>when a CFD-calculation starts, you can accept the solution as convergend by the first time steps. Afterwards the convergence should be found automatically. In a 24-hour simulation the influence of the first minutes are negligible.</FONT></SPAN></DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2>In general CFD has difficulties to convergent if there are much changes in the model and this is in the start phase.</FONT></SPAN></DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2>Additionally you can reduce the time of the timesteps or/and change the residuals.</FONT></SPAN></DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2>Regards</FONT></SPAN></DIV> <DIV><SPAN class=936500907-07022007><FONT face=Arial color=#0000ff size=2>Monika</FONT></SPAN></DIV><BR> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left> <HR tabIndex=-1> <FONT face=Tahoma size=2><B>From:</B> esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] <B>On Behalf Of </B>giulio benincasa<BR><B>Sent:</B> Tuesday, February 06, 2007 3:29 PM<BR><B>To:</B> esp-r@lists.strath.ac.uk<BR><B>Subject:</B> [esp-r] Double skin facade and CFD<BR></FONT><BR></DIV> <DIV></DIV> <DIV>Hi, i'm trying to simulate a double skin facade ( type corridor facade ) mechanically ventilated;</DIV> <DIV> </DIV> <DIV>I use for a day period integrated simulate CFD ( conflation 1 thermal)</DIV> <DIV> </DIV> <DIV>My doubt is:</DIV> <DIV> </DIV> <DIV>If</DIV> <DIV>Convergence has not been achueved after 1000 iterations </DIV> <DIV>and I accepted it as converged solution</DIV> <DIV> </DIV> <DIV>than the results are reliable ?</DIV> <DIV> </DIV> <DIV>Thank you in advance</DIV> <DIV>Best regards Giulio Benincasa  </DIV> <DIV> </DIV> <DIV>  </DIV> <DIV> </DIV> <DIV> </DIV></BODY></HTML>