Learning Forum

[mashimaro_star]

This is recently happened. When I reopen a Fluent case (which I can open using tecplot without any problem), Fluent gives me error:

"Face ID 3790811 out of declared range (1<=id<=3681795)".

I use double precision and 32 processors to calculate the case.  The mesh was generated using Fluent Meshing.

 

Is there any specific way to solve this problem? 

[Keyur Kanade]

Hi, 

Can you open that file in Fluent Meshing?

Once open in Fluent Meshing, can you please check the mesh using Mesh --> Check. 

Also check the quality of the mesh. 

If everything is ok they you can switch Fluent Meshing to Fluent mode by GUI or TUI option. 

Regards,

Keyur

[mashimaro_star]

Hi Keyur,

Thank you for the prompt reply. Yes I can open it in Fluen Meshing. The problem is that I can read the mesh using Fluent, perform computation, then save dat and cas. However, if I close the case and want to reopen the case using Fluent, it returns the error I mentioned in the original post. 

The "check" and "check the quality" reports are as follows. Could you please see if there is anything I can do? I do not want to read the mesh every time and then read the journal file to recover the case setup... Thank you very much. 

Domain extents.

x-coordinate: min = -7.617500e-02, max = 7.110600e-02.

y-coordinate: min = -2.358700e-02, max = 4.558700e-02.

z-coordinate: min = -1.885470e-01, max = 1.561000e-03.

Volume statistics.

minimum volume: 1.747063e-13.

maximum volume: 2.587584e-10.

total volume: 4.123249e-05.

Face area statistics.

minimum face area: 2.478286e-09.

maximum face area: 8.736383e-07.

average face area: 1.365562e-07.

Checking number of nodes per edge.

Checking number of nodes per face.

Checking number of nodes per cell.

Checking number of faces/neighbors per cell.

Checking cell faces/neighbors.

Checking isolated cells.

Checking face handedness.

Checking periodic face pairs.

Checking face children.

Checking face zone boundary conditions.

Checking for invalid node coordinates.

Checking poly cells.

 

Done.

 

Minimum Orthogonal Quality = 3.00263e-01

(To improve Orthogonal quality , use "Inverse Orthogonal Quality",

where Inverse Orthogonal Quality = 1 - Orthogonal Quality)

 

 

Maximum Aspect Ratio = 1.62759e+01

[Rob]

How did you transfer the mesh from Fluent Meshing to Fluent?  The mesh check there looks to have passed, but I suspect the cell ID's will be different to you'll not be able read the existing data back onto the mesh. 

Can you open the old case in serial on a machine? Also does the error stop you working, or can you continue? 

[mashimaro_star]

Thank you very much for your suggestions. Serial mode can open the old case file. 

For the parallel mode, even I use the same number of processors after and before the simulation, it returns the error. The error stop me from working...

Is there anyway that I can solve this problem? Thank you very much. 

[Rob]

Excellent news. 

OK, open in serial then read in the data & save both with a new name. Partition to 32 nodes manually and resave both (new name again). Re-try in parallel. 

I've seen it before and the above usually fixes it: it's actually possible sometimes to read into serial, save and then read into parallel but the extra step eliminates other problems. Using a different name is an additional safety step: I don't trust computers not to eat my work!  

[mashimaro_star]

Thank you very much! Problem solved!