[FLASH-USERS] WARNING after gc filling and WARNING after amr_prolong

[ERNESTO ZURBRIGGEN]

Hi Sumit!

Is your simulation able to give at least one time step?

It's likely you are having problems with the runtime
parameters: smlrho; smallp; smallt.

Check out the values you set are consistent with your setup, and have a
look at them in the user manual or
in the *setup_params* file in your object directory.

Best.
Ernesto


On Wed, 30 Jul 2025 at 19:22, Sumit Banerjee <sumitb at g.clemson.edu> wrote:

> Flash users,
>
> 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.
>
> WARNING after gc filling: min. unk(DENS_VAR)=0.9999999999999999071852E-10
>> PE=0 block=1 type=2
>> WARNING after amr_prolong: min.
>> unk(DENS_VAR)=0.9999999999999999071852E-10 PE=0 block=1 type=2
>
>
> GPT says this is because the density variable filled in the ghost cells
> are below the threshold which is usually set to 10^-10.
>
> 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?
>
> *Clear Skies,*
> *Sumit (Sam)*
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