Learning Forum

[AndyHor]

Hi everyone , I always face the unknown unit type error during the overnight simulation for fluent, using university computer. Could anyone please help me ?

 

[Rob]

Odd. Has anything changed, or will anything change at that solution time/timestep? What happens if you click iterate again? 

[AndyHor]

I had tried for many days in the uni lab. Because the lab closed at 5pm everyday, so I let it run overnight, but when i get back the next morning, it prompted this message. I didnot do any change on the computer. When I click ok on the error box, It say calculation completed and stop at the time step. 

[Rob]

Weird. Try dropping the time step as you're aiming for convergence in 10-15 iterations. I wonder if it's a convergence issue somewhere.  Also write a transcript (under File) so you can check when it fails: it could be IT related. 

[AndyHor]

Yes, could you please teach me on how to write a transcript to check ? 

[Rob]

Look in the File menu. There will be a "start transcript" option, may be down a menu level depending on whether you're also using Workbench. 

[AndyHor]

Yes I am using Workbench R1. I found a funny trick, before I run overnight calculation, I have to save, close the Workbench, and restart again then run the calculation, It is okay then till now, 2 days. I will see whether it will prompt any error a few days later.

[1456766892]

oh god, I have the same problem.My calculation time step number is very large, do not know how to solve this matter.

[chaochao.wang]

I also met the same problem, but only with fluent software, not workbench.