# 2nd order conservative schemes

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 September 15, 2008, 00:05 2nd order conservative schemes #1 taw Guest   Posts: n/a Dear fellows, I want to use second order conservative schemes, especially for the k.e. therm that would keep the code stable or realizable enough, for DNS stability simulation of a high Re flow. The main reason to go for 2nd order is to keep my present 2nd order code intact, i.e. instead of going to the 4th order scheme. Being new to these idea and after skimming through Morinishi, 1998 I kind of got the impression that for 2nd order schemes to be conservative in the kinetic energy sense, one should use a uniform grid. Do you think I got the idea right. Or is there another way around to tackle this problem, without going for the 4th order scheme. My code use a collocated grid in primitive variable formulation in Cartesian coordinate system only. I plan to simulate a simple geometry, a flat plate. Regards TAW

 September 16, 2008, 07:05 Re: 2nd order conservative schemes #2 Andrew Clarke Guest   Posts: n/a I had a similar problem in my work before. I just reduced the underrelexation factors in the Solution Controls panel for appropriate factors. In my case, i got pressure-correction divergence reported in second order solving but when i reduced the pressure underrelaxation to 0.2 and momentum to 0.4, i could get stability quite well but solutions took more iterations. The selection of underrelaxation factors is a matter of trial and error.

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Far Main CFD Forum 7 March 14, 2013 12:29 ken FLUENT 8 March 14, 2013 03:43 Far FLUENT 0 May 22, 2011 01:50 Valle OpenFOAM 0 August 26, 2009 08:12 Prateep Chatterjee FLUENT 0 January 19, 2003 00:31

All times are GMT -4. The time now is 01:20.

 Contact Us - CFD Online - Privacy Statement - Top