[FLASH-USERS] output files: Getting started guide?

[Blackman David]

Actually to add to the previous question, is there any simple documentation on how to process these files? The flash documentation doesn't provide a particularly straightforward answer. The yt-project is a reasonable choice. I am planning to run a large quantity of flash simulations coupled with PIC simulations. For this purpose I would need to write some sort of automated script to generate a cartesian or cylindrical grid. The yt-project seems like a good place to start, but a simple understanding of how to reconstructed the flash grid into an array of co-ordinates of vertices would be helpful.
________________________________
From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of Leland Ellison <lee at pacificfusion.energy>
Sent: 06 October 2023 17:42
To: Ryan Farber <rjfarber at umich.edu>
Cc: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: Re: [FLASH-USERS] output files: Getting started guide?

Another good option for visualizing FLASH output is VisIt:
https://visit-dav.github.io/visit-website/index.html

One hiccup you might encounter is an error when attempting to open FLASH files using the default VisIt settings. You can remedy this with either:
(i) In the Open File menu, look for the  "Open file as type" box and choose: FLASH (If this fails, try restarting VisIt. Once the above error happens it seems to perpetually fail even if you specify the file type.)
(ii) If you're launching VisIt from the command line, add the argument: -assume_format FLASH

Best,
Lee

On Fri, Oct 6, 2023 at 6:27 AM Ryan Farber <rjfarber at umich.edu<mailto:rjfarber at umich.edu>> wrote:
Hi Joe,

8x8 refers to the number of cells per block.
The 53 probably refers to the number of blocks.
Additional details might be in the FLASH user guide.

I'd recommend just using yt. yt is for analysis as well as visualization.

Best,
--------
Ryan


On Thu, Oct 5, 2023 at 8:05 PM Joe Frisch <joseffrisch at google.com<mailto:joseffrisch at google.com>> wrote:
Just getting started with FLASH just got the sedov code (with the default parameters) to run, trying to understand the output files.  For example there is a hdf5 output file sedov_hdf5_plt_cnt_0000

That contains grid data in 'coordinates"  which has 53 x,y,z locations

There is also "pres' (presumably pressure) , 'temp" (presumably temperature)  and desdata.

Those objects are 4-dimensional:   [53,1,8,8]
where is that defined / described?
The 53 presumably maps onto the 53 plot coordinates.  But 8X8??  Those seem to be either initial or final state, but not in a pattern I can decypher

Is the plot file format , or more specifically the fields in the plot file defined somewhere?

Maybe this is the wrong approach and I should just use yt?   does yt provide access to all the data for analysis or is it just a plotting tool?




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