Grid Reynolds is above 2 but Central Linear convection scheme works ! -- CFD Online Discussion Forums

April 21, 2012, 13:00	Grid Reynolds is above 2 but Central Linear convection scheme works !	#1
maysmech Senior Member Join Date: Jan 2010 Posts: 347 Blog Entries: 2 Rep Power: 17	Dear Foamers, As you know in linear central scheme of convection term the grid Reynolds (=Udx/nu) number should be less than 2. If it would be more than 2, the results should be diverged or wrong because of minus in coefficient. I have simulated a 11 m2 lid-driven cavity with the Reynolds number of 10000 (Re=U1/nu) and 200200 grids which leads to grid Reynolds in range of 50. it is so far from 2 but results are in good agreement with Ghia (1982) benchmark. My question: Why central scheme works in this high grid Reynolds number? Has it any artificial viscosity been added in OpenFOAM? Regards,

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 Off Trackbacks are Off Pingbacks are On Refbacks are On Forum Rules

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
AUSM scheme ? Central Scheme	boling	Main CFD Forum	7	January 7, 2016 02:41
Compact scheme for nonuniform grid?	Dong	Main CFD Forum	3	July 1, 2008 23:44
Upwing vs Central scheme	Ruben	Main CFD Forum	15	August 8, 2005 06:13
Best scheme for 2d convection	Ambady Suresh	Main CFD Forum	1	June 14, 2002 12:10
High-order scheme and grid	z.zeng	Main CFD Forum	6	October 14, 2000 13:10

All times are GMT -4. The time now is 15:05.