<html> <head> <meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <meta name=Generator content="Microsoft Word 11 (filtered)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Hi Giulio,   you have more than one possibility to get oscillating flow results under control:   (1)                 Try changing various parameters in regard to the solver control: in simulator, after “initialize”, g … simulation toggles (pwd 101), g … mass flow parameters, and / or (2)                 Use time step controller: in simulator, after “initialize”, t … invoke time-step controller, choice 4 (I think) was quite good (you need to have your time steps at hand, for which this should happen) and – last not least – (3)                 Change the relaxation parameter for the time-step controller in mfmach.f, lines 491 to 500. You need to uncomment these lines, then you can change the relaxation parameter (these work with choice 4 from above, as the source tells). 0.25 to 0.65 were useful values, I think (ESRU, please intervene if I am writing trash, here).   <div>   Mit freundlichen Grüssen / Best regards   Achim Geissler </div> <div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center tabindex=-1> </div> From: esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] On Behalf Of giulio benincasa Sent: Wednesday, April 18, 2007 11:57 AM To: esp-r@lists.strath.ac.uk Subject: [esp-r] Time step control relaxation </div>   Dear all, I have read that is possible change relaxation parameter in source code to calm oscillations results  arrange to  (in the air-flow network) similar temperature nodes and flow-connections that have very little pressure drops across them. There is anybody that know tje soutce code file where  make  modify  ?? Best regards Thank you in advance Giulio Benincasa </div> </div> </body> </html>