|
[Sponsors] |
February 21, 2012, 01:42 |
Error #001100279
|
#1 |
New Member
Mahesh
Join Date: Jan 2012
Location: Pune
Posts: 5
Rep Power: 14 |
/*this is out file error message*/
+--------------------------------------------------------------------+ | ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | Floating point exception: Overflow | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | ERROR #001100279 has occurred in subroutine ErrAction. | | Message: | | Stopped in routine FPX: C_FPX_HANDLER | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The ANSYS CFX solver exited with return code 1. No results file | | has been created. | +--------------------------------------------------------------------+ End of solution stage. +--------------------------------------------------------------------+ | The following transient and backup files written by the ANSYS CFX | | solver have been saved in the directory E:\original | | model\transient\solve2\with diffuser_original_trans_18feb_002: | | | | 1115_full.trn, 1114_full.trn, 1113_full.trn, 1112_full.trn, | | 1111_full.trn, 1110_full.trn, 1109_full.trn, 1108_full.trn, | | 1107_full.trn, 1106_full.trn, 1105_full.trn, 1104_full.trn, | | 1103_full.trn | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | The following user files have been saved in the directory | | E:\original model\transient\solve2\with | | diffuser_original_trans_18feb_002: | | | | mon | +--------------------------------------------------------------------+ +--------------------------------------------------------------------+ | Warning! | | | | After waiting for 60 seconds, 1 solver manager process(es) appear | | not to have noticed that this run has ended. You may get errors | | removing some files if they are still open in the solver manager. | +--------------------------------------------------------------------+ This run of the ANSYS CFX Solver has finished. /*error msg ond*/ this is your reply to one of post Overflow error means the solver has diverged big-time. You need to improve the numerical stability. This could be improve mesh quality, better initial conditions, improperly set boundary conditions or physics. On rare occasions you need double precision numerics what do you mean by improve numerical stability? for initial I used steady state res file and started run which completed 100 iterations then stopped solver. After I continued same run but ends with above error. i used expression for varying pressure at inlet memory allocation factor= 1.1 Thanks in advace. |
|
February 21, 2012, 16:19 |
|
#2 | |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Quote:
Have you considered your mesh quality? How suitable is your initial condition? Are your boundary conditions and physics correct? Have you tried double precision numerics? Have you tried a smaller time step? |
||
February 23, 2012, 03:09 |
|
#3 |
New Member
Mahesh
Join Date: Jan 2012
Location: Pune
Posts: 5
Rep Power: 14 |
i did meshing in icem cfd with mesh quality as given below
Min = 0.000696609, max = 1, mean = 0.673647743127 3851746 elements with the "Quality" diagnostic 0 elements for which this diagnostic is undefined Histogram of Quality values 0.95 -> 1.0 : 578492 (15.019%) 0.9 -> 0.95 : 572927 (14.874%) 0.85 -> 0.9 : 256030 (6.647%) 0.8 -> 0.85 : 194666 (5.054%) 0.75 -> 0.8 : 191400 (4.969%) 0.7 -> 0.75 : 193965 (5.036%) 0.65 -> 0.7 : 191099 (4.961%) 0.6 -> 0.65 : 196635 (5.105%) 0.55 -> 0.6 : 227036 (5.894%) 0.5 -> 0.55 : 255466 (6.632%) 0.45 -> 0.5 : 201973 (5.244%) 0.4 -> 0.45 : 153878 (3.995%) 0.35 -> 0.4 : 113302 (2.942%) 0.3 -> 0.35 : 103463 (2.686%) 0.25 -> 0.3 : 95894 (2.490%) 0.2 -> 0.25 : 92426 (2.400%) 0.15 -> 0.2 : 84444 (2.192%) 0.1 -> 0.15 : 68100 (1.768%) 0.05 -> 0.1 : 59865 (1.554%) 0.0 -> 0.05 : 20685 (0.537%) due to model complexicity i can not improve mesh quality. i used prism meshing. by using this i gave steady state run this are images of run. http://www.mediafire.com/download.php?wx5fqhax3xajxvv http://www.mediafire.com/download.php?vmyolav9vhqqg5y i used k-epsilon first but error occurs so as read on forum i changed timesteps to smaller one with double precision but then also it fails. at inlet condition its considering as opening type boundary instead of inlet one. |
|
February 24, 2012, 09:10 |
|
#4 | |
Senior Member
Join Date: May 2011
Location: Germany
Posts: 130
Rep Power: 14 |
Quote:
What about the other mesh paramters? Min angle, mesh expansion factor, aspect ratio? Where are these bad cells positioned? Have you check where your max residuals are? |
||
February 25, 2012, 05:50 |
|
#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Have you tried a smaller time step?
|
|
March 2, 2012, 21:25 |
|
#6 |
New Member
Mahesh
Join Date: Jan 2012
Location: Pune
Posts: 5
Rep Power: 14 |
sorry for late reply.
there was problem in physics. now its solved. run under progress. i gave run for total time= 10 sec and time steps=50*0.1,25*0.2 do i have to run for even for smaller time steps? |
|
March 3, 2012, 05:17 |
|
#7 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
The normal practise for CFD analysis is:
1) Set the basic simulation up so all the physics seems to be modelled and doinjg believeable things. 2) Do sensitivity analysis on all adjustable parameters to get the simulation accurate. It looks like you have completed step 1. Now you have to do step 2. This means you need to show your convergence, mesh, time step size, advection scheme and any other adjustable parameters are correctly set to give an accurate simulation. |
|
|
|