[widad]

Hello,
I used Fluent for Flow simulation, but i have a problem with incrementation of iterations wich is blocked in one number as you can see below :


iter continuity x-velocity y-velocity z-velocity energy k
!16777216 solution is converged
16777216 5.7144e-06 8.5447e-08 1.1905e-07 7.4299e-08 7.0228e-08
16777216 5.8402e-05 7.7194e-04 2.9054e-04 5.8629e-04 5.4369e-06
16777216 3.8929e-04 2.8179e-06 1.0037e-05 2.6640e-06 8.0121e-08
16777216 4.2810e-05 6.1503e-07 2.6153e-07 6.8516e-07 7.5695e-08
16777216 1.1685e-05 2.1724e-07 1.5408e-07 2.3194e-07 7.1890e-08
16777216 7.2224e-06 1.2360e-07 1.2990e-07 1.2009e-07 7.0474e-08
!16777216 solution is converged
photo non increm d'iteration.jpg

If someone had the same prob or if you can help me to solve that
Thank you

[LuckyTran]

That's the largest number that a float (32-bit) can hold. The number can't be incremented anymore. For a more detailed explanation see IEEE 754.

You might want to try using the double precision version of Fluent if you aren't already. But if the counter is cast as a float in the code then there is nothing you can do about it.

[widad]

hello;
But this number is in the first iteration
It s not started like from 1 or 0 and then after a number of iteration don t change

[LuckyTran]

You are on timestep 1900523. At 10 iterations per time-step that means you are on iteration 19005230 which is bigger than 16777216. Even supposing that you converge in 5 iterations each time-step that's still a lot bigger than 1.

So no, this is not the first iteration.

The counter counts all iterations done, not just the iterations in a time-step.

[widad]

Yeah i understand that, thank you
Do you know how can i initialize time and iteration , cause like when i run an other calculate it started by the max number which is that is the picture so it could not increase

[LuckyTran]

You should reset your residuals and that should set your iteration counter to 0. The timestep and physical time can be set to 0 (or any other number) by typing into the TUI:

(rpsetvar 'flow-time 0)
(rpsetvar 'time-step 0)

You can also reset the iteration counter the same way but off the top of my head I don't remember what the iteration counter variable is called.

[widad]

Hello,
I used Fluent for Flow simulation, but i have a problem with incrementation of iterations wich is blocked in one number as you can see below :


iter continuity x-velocity y-velocity z-velocity energy k
!16777216 solution is converged

How can i reset the iteration

[LuckyTran]

Is there a reason you can't just reset the residuals? Using the GUI or the TUI command: solve/montiors/residual/reset yes
Doing so would reset the iteration counter to 0

[widad]

Thank you ,
I have also this notification : error at host update_time_level invalid data
did you an idea about it or how to solve