[FLASH-USERS] No HDF5 Output from Simulations

[ERNESTO ZURBRIGGEN]

Hi Roy.
Have you already overcome this problem?

If not, could you send us the setup line that you are using and the
resulting log file from the run?

Best,
Ernesto

On Mon, 6 Apr 2026 at 14:55, Roy, Anuranj <anuranj.roy at wsu.edu> wrote:

> Hello all,
>
> I've been learning how to setup and run flash, and I've gone through the
> quick start guide with the Sedov problem. Everything seems to work well;
> compiling produced the flash4 executable and running it doesn't produce any
> immediate/obvious errors.
>
> My issue is that I have no hdf5 files that are written, and I'm unsure
> where in the .par file, or any other configuration file, is producing this
> issue. I noticed that the .par file has an I/O parameters section (pasted
> below) that it's supposed to write it every 0.01 seconds and ends at 0.05
> seconds. Going through the manual didn't highlight any obvious issues, to
> my understanding FileIntervalStep and FileNumber is for how often to write
> the checkpoints and what checkpoint to start the simulation on respectively.
>
> I'm unsure what I'm doing wrong to be causing this issue, and I'm not sure
> what to look at for any diagnostics. The .log file doesn't seem to tell me
> anything and the immediate output when running the executable is a couple
> lines about the initial parameters that don't seem to ever change.
>
> Any help would be greatly appreciated,
> Anuranj Roy
>
> I/O parameters from flash.par:
> ```
> # Simulation time, I/O  parameters
>
> cfl = 0.8
> basenm          = "sedov_"
> restart         = .false.
>
>
> # checkpoint file output parameters
> checkpointFileIntervalTime = 0.01
> checkpointFileIntervalStep = 0
> checkpointFileNumber = 0
>
> # plotfile output parameters
> plotfileIntervalTime = 0.
> plotfileIntervalStep = 0
> plotfileNumber = 0
>
> nend            = 10000
> tmax            = 0.05
>
> run_comment     = "Sedov explosion"
> log_file        = "sedov.log"
> eintSwitch     = 1.e-4
>
> plot_var_1 = "dens"
> plot_var_2 = "pres"
> plot_var_3 = "temp"
> ```
>
> Console output when running flash4
>
> ```
>  Grid_init: resolution based on runtime params:
>   lrefine          dx              dy
>       1             0.125           0.125
>       2             0.062           0.062
>       3             0.031           0.031
>       4             0.016           0.016
>       5             0.008           0.008
>       6             0.004           0.004
>  MaterialProperties initialized
>  Cosmology initialized
>  Source terms initialized
>   iteration, no. not moved =            0           0
>  refined: total leaf blocks =            1
>  refined: total blocks =            1
>  [amr_morton_process]: Initializing surr_blks using standard orrery
> implementation
>   iteration, no. not moved =            0           0
>  refined: total leaf blocks =            4
>  refined: total blocks =            5
> ```
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