[Tait10]

Currently moving from my own computer to HPC. Learning a lot about bash scripts and have run into a couple of barriers.

When writing a .dat file, it appears to only give me the last timestep saved in that .dat file. Do I need to write a new .dat file for every timestep along the way in order for it to save every timestep? I am using TecPlot as my post-processor if that helps. If this is the case, is there another command for that that doesn't end with me using 6000 lines of code in one .jou file?

Do I also need to write a .cas file along with the .dat file? No moving mesh so I wouldnt have thought it needed it on every ts, just at the end. .jou file posted below for you to have a look, cheers in advance.

; Read case file
rc FFF.1-Setup-Output.cas.gz
; Initialize the solution
/solve/initialize/hyb-initialization
; the time-step size as 0.01 (seconds)
/solve/set/time-step 0.01

;No of it
;Max it per time step
/solve/dual-time-iterate
1000
20
; Write data file (compressed, iteration number included in file name)
wd initial_testing_output_ts10.gz

;No of it
;Max it per time step
/solve/dual-time-iterate
1000
20
; Write data file (compressed, iteration number included in file name)
wd initial_testing_output_ts20.gz
; Exit FLUENT
exit
yes

[LuckyTran]

The .dat file only contains the variables at the time-step when it is saved. If you want data from multiple time-steps, then yes you need to save a bunch of .dat files.

You do not need to save a .cas file every time since the mesh does not change.

Easiest way is to setup automatic saving of .dat every x time-steps. In the GUI you'd go to File=>Write=>Autosave in the ribbon. But you can also find it in Calculation Activities=> Autosave.

If you want to use TUI commands, they are:

/file/auto-save/root-name
 /file/auto-save/append-file-name
/file/auto-save/case-frequency
/file/auto-save/data-frequency
 /file/auto-save/retain-most-recent-files

Brief tutorial:

/file/auto-save/root-name "path/myCase"

Usually you can skip this command entirely if you plan to save in the working directory

Then you will need:

/file/auto-save/append-file-name-with time-step 6
or
/file/auto-save/append-file-name-with flow-time 6

Most people have a preference for either the physical simulation time or the time-step counter in their filenames. 6 is number of decimals for the flow-time/time-step. Use the default 6 or adjust to your needs.

/file/auto-save/case-frequency [arg]

take one of three arguments

each-time
if-case-is-modified
if-mesh-is-modified

Pretty self-explanatory. You'll want one of the later two, doesn't really matter which one.

/file/auto-save/data-frequency 1

1 will save a .dat file every time-step. Usually a bigger number (i.e. 10, 100, etc.), but set this for your purpose.

/file/auto-save/retain-most-recent-files no

set to no so that it doesn't delete the .dat files automatically

Actual example:

/file/auto-save/append-file-name time-step 6
/file/auto-save/case-frequency if-mesh-is-modified
/file/auto-save/data-frequency 1
/file/auto-save/retain-most-recent-files no

Put these lines somewhere before your /solve/dual-time-iterate

[Tait10]

Originally Posted by LuckyTran

The .dat file only contains the variables at the time-step when it is saved. If you want data from multiple time-steps, then yes you need to save a bunch of .dat files.

You do not need to save a .cas file every time since the mesh does not change.

Easiest way is to setup automatic saving of .dat every x time-steps. In the GUI you'd go to File=>Write=>Autosave in the ribbon. But you can also find it in Calculation Activities=> Autosave.

If you want to use TUI commands, they are:

/file/auto-save/root-name
 /file/auto-save/append-file-name
/file/auto-save/case-frequency
/file/auto-save/data-frequency
 /file/auto-save/retain-most-recent-files

Brief tutorial:

/file/auto-save/root-name "path/myCase"

Usually you can skip this command entirely if you plan to save in the working directory

Then you will need:

/file/auto-save/append-file-name-with time-step 6
or
/file/auto-save/append-file-name-with flow-time 6

Most people have a preference for either the physical simulation time or the time-step counter in their filenames. 6 is number of decimals for the flow-time/time-step. Use the default 6 or adjust to your needs.

/file/auto-save/case-frequency [arg]

take one of three arguments

each-time
if-case-is-modified
if-mesh-is-modified

Pretty self-explanatory. You'll want one of the later two, doesn't really matter which one.

/file/auto-save/data-frequency 1

1 will save a .dat file every time-step. Usually a bigger number (i.e. 10, 100, etc.), but set this for your purpose.

/file/auto-save/retain-most-recent-files no

set to no so that it doesn't delete the .dat files automatically

Actual example:

/file/auto-save/append-file-name time-step 6
/file/auto-save/case-frequency if-mesh-is-modified
/file/auto-save/data-frequency 1
/file/auto-save/retain-most-recent-files no

Put these lines somewhere before your /solve/dual-time-iterate

This is fantasic, thanks so much. Will post back if I once again find myself at the mercy of my own incompetence.