CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > SU2

Strange residuals trend

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   June 4, 2013, 10:53
Default Strange residuals trend
  #1
Member
 
Roberto Pieri
Join Date: Feb 2012
Location: Milan
Posts: 57
Rep Power: 5
robyTKD is on a distinguished road
Hi developers,

running a direct simulation on a subsonic case I found a strange trend of the residuals as you can see below:

Code:
TITLE = "SU2 Simulation"
VARIABLES = "Iteration","CLift","CDrag","CSideForce","CMx","CMy","CMz","CFx","CFy","CFz","CL/CD","Res_Flow[0]","Res_Flow[1]","Res_Flow[2]","Res_Flow[3]","Res_Flow[4]","Res_Turb[0]","Linear_Solver_Iterations","Time(min)"
ZONE T= "Convergence history"
...
        7904, 0.2578906743, 0.0092747485, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057006271, 0.0002688439, 0.2580572583, 0.0000000000, 27.8056783402, -5.3620574586, -2.0099686806, -3.7912108836, 0.1793780325, 0.0000000000, -4.9291935971, 67.0000000000, 302.9638412167
        7905, 0.2578905668, 0.0092747235, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057006062, 0.0002688226, 0.2580571500, 0.0000000000, 27.8057418847, -5.3620666353, -2.0099773734, -3.7912080048, 0.1793694593, 0.0000000000, -4.9291990197, 55.0000000000, 302.9937163667
        7906, 0.2578904593, 0.0092746984, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057005853, 0.0002688013, 0.2580570417, 0.0000000000, 27.8058054211, -5.3620758134, -2.0099860664, -3.7912051029, 0.1793608844, 0.0000000000, -4.9292044397, 78.0000000000, 303.0319785833
        7907, 0.2578903518, 0.0092746734, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057005644, 0.0002687800, 0.2580569334, 0.0000000000, 27.8058689490, -5.3620849934, -2.0099947595, -3.7912021875, 0.1793523075, 0.0000000000, -4.9292098573, 74.0000000000, 303.0682667000
        7908, 0.2578902444, 0.0092746483, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057005435, 0.0002687587, 0.2580568252, 0.0000000000, 27.8059324686, -5.3620941753, -2.0100034530, -3.7911992570, 0.1793437287, 0.0000000000, -4.9292152724, 57.0000000000, 303.0979531333
        7909, 0.2578901370, 0.0092746233, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057005226, 0.0002687374, 0.2580567169, 0.0000000000, 27.8059959801, -5.3621033589, -2.0100121468, -3.7911963053, 0.1793351477, 0.0000000000, -4.9292206850, 88.0000000000, 303.1407903167
        7910, 0.2578900296, 0.0092745982, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057005017, 0.0002687161, 0.2580566087, 0.0000000000, 27.8060594831, -5.3621125444, -2.0100208407, -3.7911933367, 0.1793265651, 0.0000000000, -4.9292260952, 53.0000000000, 303.1691070000
        7911, 0.2578899222, 0.0092745732, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057004808, 0.0002686949, 0.2580565005, 0.0000000000, 27.8061229780, -5.3621217317, -2.0100295350, -3.7911903505, 0.1793179803, 0.0000000000, -4.9292315029, 68.0000000000, 303.2028496500
        7912, 0.2578898148, 0.0092745481, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057004599, 0.0002686736, 0.2580563924, 0.0000000000, 27.8061864645, -5.3621309213, -2.0100382295, -3.7911873473, 0.1793093935, 0.0000000000, -4.9292369082, 53.0000000000, 303.2311020333
        7913, 0.2578897075, 0.0092745231, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057004390, 0.0002686523, 0.2580562843, 0.0000000000, 27.8062499430, -5.3621401128, -2.0100469244, -3.7911843312, 0.1793008048, 0.0000000000, -4.9292423111, 74.0000000000, 303.2726971000
        7914, 0.2578896002, 0.0092744981, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057004182, 0.0002686310, 0.2580561761, 0.0000000000, 27.8063134131, -5.3621493062, -2.0100556194, -3.7911812926, 0.1792922144, 0.0000000000, -4.9292477117, 79.0000000000, 303.3170581500
        7915, 0.2578894929, 0.0092744730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003973, 0.0002686098, 0.2580560680, 0.0000000000, 27.8063768750, -5.3621585022, -2.0100643148, -3.7911782495, 0.1792836217, 0.0000000000, -4.9292531099, 66.0000000000, 303.3513538000
        7916, 0.2578893857, 0.0092744480, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003764, 0.0002685885, 0.2580559600, 0.0000000000, 27.8064403289, -5.3621676998, -2.0100730105, -3.7911751815, 0.1792750272, 0.0000000000, -4.9292585059, 79.0000000000, 303.3907992333
        7917, 0.2578892784, 0.0092744230, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003556, 0.0002685673, 0.2580558519, 0.0000000000, 27.8065037749, -5.3621769004, -2.0100817064, -3.7911721109, 0.1792664304, 0.0000000000, -4.9292638995, 73.0000000000, 303.4277142000
        7918, 0.2578891712, 0.0092743980, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003347, 0.0002685460, 0.2580557439, 0.0000000000, 27.8065672129, -5.3621861029, -2.0100904027, -3.7911690165, 0.1792578319, 0.0000000000, -4.9292692908, 58.0000000000, 303.4577453833
        7919, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -2.0100990995, -3.7911659169, 0.1792492310, 0.0000000000, -16.0000000000, 100.0000000000, 303.5082288667
        7920, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.5599338500
        7921, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.6111823167
        7922, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.6623054833
        7923, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.7136734000
        7924, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.7653447167
        7925, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.8160094333
        7926, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.8676317333
        7927, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.9190650167
        7928, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 303.9698802500
        7929, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 304.0220018833
        7930, 0.2578890640, 0.0092743730, 0.0000000000, 0.0000000000, 0.0000000000, 0.0057003138, 0.0002685247, 0.2580556359, 0.0000000000, 27.8066306430, -5.3621953078, -16.0000000000, -16.0000000000, -16.0000000000, 0.0000000000, -16.0000000000, 100.0000000000, 304.0725622833
...
Please see columns referred to Res_Turb[0], Res_Flow[1], Res_Flow[2], Res_Flow[3].
For more clarity the case is the following:
  • NACA0012
  • M = 0.5
  • AoA = 2 deg
  • Re = 6E6
  • SA turbulent model
robyTKD is offline   Reply With Quote

Old   June 13, 2013, 16:07
Default
  #2
Member
 
Trent Lukaczyk
Join Date: Feb 2011
Location: Stanford, CA
Posts: 75
Rep Power: 6
rktchip is on a distinguished road
roby have you sorted this out?
- trent
rktchip is offline   Reply With Quote

Old   June 17, 2013, 08:01
Default
  #3
Member
 
Roberto Pieri
Join Date: Feb 2012
Location: Milan
Posts: 57
Rep Power: 5
robyTKD is on a distinguished road
Hi Trent,

I meet this problem when using a second order scheme without limiter or, in some cases, using multigrid.
robyTKD is offline   Reply With Quote

Old   June 19, 2013, 13:53
Default
  #4
Member
 
Trent Lukaczyk
Join Date: Feb 2011
Location: Stanford, CA
Posts: 75
Rep Power: 6
rktchip is on a distinguished road
kk can you post your config file?
rktchip is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange residuals of the Density Based Solver Pat84 FLUENT 0 October 22, 2012 15:59
kOmegaSST omega residuals strange behaviour zordiack OpenFOAM Running, Solving & CFD 0 August 8, 2012 16:23
Strange behavior of velocity residuals skullCFD FLUENT 2 June 3, 2011 11:53
Strange Residuals in CCM+ PeterGG CD-adapco 3 July 27, 2007 12:52
Incresing trend of residuals Vidya FLUENT 1 August 13, 2006 23:57


All times are GMT -4. The time now is 19:23.