[FLASH-USERS] Laser Slab: User-defined Plot Vars

[Ryan Farber]

Hi Kemal,

While you definitely can introduce user defined variables* you can also
define "derived_fields" in yt (https://yt-project.org/; and I'd guess
something similar is possible in Visit) that allow you to do this purely in
post-processing. The benefit of doing so in post-processing is you'll save
some memory compared to introducing additional variables**

*To introduce your own variable, put a "VARIABLE varr" in your Config. Note
that FLASH variables are conventionally four characters. You can then
update it sometime after you update "dens" and "tele" before outputting.

**Also note I believe all variables saved in plot files are also saved in
checkpoint files and plot files; it would be an interesting feature if some
variables could be excluded from checkpoints though, as outputting
checkpoint files becomes quite expensive in my high resolution simulations,
and some of the fields I've introduced don't need to persist their values
across restarts.

Best,
--------
Ryan


On Thu, Apr 20, 2023 at 1:04 AM Kemal Atay <ataykemal33 at gmail.com> wrote:

> Hello everyone,
>
> I am running a laserlab simulation with modified conditions.
> I want to output a 2d plot of the simulation that give the product of the
> plot variables "dens" and "tele" (electron temp) factored by an exponential
> of the "tele". I am wondering if there is a way to output a user
> defined plot variable that is a mathematical expression of the regular plot
> vars.
> Is this possible?
>
> Kemal
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