<div dir="ltr">Hi Sumit! <div><br></div><div>Is your simulation able to give at least one time step? </div><div><br></div><div>It's likely you are having problems with the runtime parameters: smlrho; smallp; smallt. </div><div><br></div><div>Check out the values you set are consistent with your setup, and have a look at them in the user manual or </div><div>in the <i><font face="monospace">setup_params</font></i> file in your object directory. </div><div><br></div><div>Best. </div><div>Ernesto </div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 30 Jul 2025 at 19:22, Sumit Banerjee <<a href="mailto:sumitb@g.clemson.edu" target="_blank">sumitb@g.clemson.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 dir="ltr"><div>Flash users,</div><div><br></div><div>I have been trying to simulate the Sod test problem using astronomical units where the box dimensions are in parsecs and the corresponding physical quantities are equal to the ambient surroundings in the ISM. I have the density value to be 10^-23 on the left, 10^-24 on the right and the pressure values to be 10^-12 on the left and 10^-13 on the right in the cgs units. When I run the code, I am getting the below warning messages on the log file and the plots (attached is from one of the check files) look weird.</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">WARNING after gc filling: min. unk(DENS_VAR)=0.9999999999999999071852E-10 PE=0 block=1 type=2<br>WARNING after amr_prolong: min. unk(DENS_VAR)=0.9999999999999999071852E-10 PE=0 block=1 type=2</blockquote><div><br></div><div>GPT says this is because the density variable filled in the ghost cells are below the threshold which is usually set to 10^-10.</div><div><br></div><div>I am not sure how I should proceed with this simulation. How do I set the values of the density and pressure in the par file?</div><div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><i><font face="verdana, sans-serif">Clear Skies,</font></i><div><i><font face="verdana, sans-serif">Sumit (Sam)</font></i></div></div></div></div></div>
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