<div dir="ltr">Hi Roy. <div>Have you already overcome this problem? </div><div><br></div><div>If not, could you send us the setup line that you are using and the resulting log file from the run? </div><div><br></div><div>Best, </div><div>Ernesto</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, 6 Apr 2026 at 14:55, Roy, Anuranj <<a href="mailto:anuranj.roy@wsu.edu">anuranj.roy@wsu.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-3339647086992290512">
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Hello all,</div>
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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.</div>
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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.</div>
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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.</div>
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Any help would be greatly appreciated,</div>
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Anuranj Roy</div>
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I/O parameters from flash.par:</div>
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```</div>
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# Simulation time, I/O parameters</div>
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cfl = 0.8</div>
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basenm = "sedov_"</div>
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restart = .false.</div>
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# checkpoint file output parameters</div>
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checkpointFileIntervalTime = 0.01</div>
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checkpointFileIntervalStep = 0</div>
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checkpointFileNumber = 0</div>
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# plotfile output parameters</div>
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plotfileIntervalTime = 0.</div>
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plotfileIntervalStep = 0</div>
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plotfileNumber = 0</div>
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nend = 10000</div>
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tmax = 0.05</div>
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run_comment = "Sedov explosion"</div>
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log_file = "sedov.log"</div>
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eintSwitch = 1.e-4</div>
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plot_var_1 = "dens"</div>
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plot_var_2 = "pres"</div>
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plot_var_3 = "temp"</div>
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```</div>
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Console output when running flash4</div>
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```</div>
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Grid_init: resolution based on runtime params:</div>
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lrefine dx dy</div>
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1 0.125 0.125</div>
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2 0.062 0.062</div>
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3 0.031 0.031</div>
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4 0.016 0.016</div>
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5 0.008 0.008</div>
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6 0.004 0.004</div>
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MaterialProperties initialized</div>
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Cosmology initialized</div>
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Source terms initialized</div>
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iteration, no. not moved = 0 0</div>
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refined: total leaf blocks = 1</div>
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refined: total blocks = 1</div>
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[amr_morton_process]: Initializing surr_blks using standard orrery implementation</div>
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iteration, no. not moved = 0 0</div>
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refined: total leaf blocks = 4</div>
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refined: total blocks = 5</div>
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```</div>
</div>
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