Mesh Sensitivity analysis

[Arif Mahmud]

Good Day Everyone!

I was looking for a way to compare different mesh size simulation results with one another for finding the resolved mesh case.

After googling the situation I came across this post in thunderhead forum, https://forum.thunderheadeng.com/index.php?topic=356.0

From that post I came across a paper,

"TOWARD FDS 6: COMPLEX GEOMETRY, EMBEDDED MESHES, AND QUALITY ASSESSMENT" presented at V European Conference on Computational Fluid Dynamics (ECCOMAS CFD 2010) in June of 2010.

One of the process explained in the paper for finding mesh resolved case was "Measure of Turbulence Resolution" and then I got a youtube instruction video from thunderhead channel,

https://www.youtube.com/watch?v=KiFYNuC88SU

The option "Turbulence Resolution" under "Gas Phase Quantity" of  2D output slice is missing in my version of PyroSim (PyroSim-2018-2-0730-x64-en).

Now please provide further instruction for recreating this MTR comparison on my version of PyroSim or some other widely accepted ways of finding the mesh resolved case.

After emailing thunderhead sales, Mr. Bryan Klein referred me here to Mr. Randy McDermott.

Thanks in advance.

Best regards,
____________________________________________
Md. Arif Mahmud Shuklo Shoshe

Assistant Professor

Department of Mechanical and Production Engineering
Ahsanullah University of Science and Technology.

[Kevin]

Just add the line manually to your input file

&DEVC ID=..., QUANTITY=... /

[Ben Ralph]

The current best practice is as outlined in the User Guide. You need to post-process the vectorised velocity data yourself. Take a look at section 20.10.23. Bare in mind that if your simulation isn't steady state then picking a time averaging period is hard/impossible/not applicable. Also tricky to define an acceptable value for an (engineering?) application

Take a look at the wavelet error measure and background information to see if this suits your needs better

Alternatively; compare your key QUANTITY(s) of interest though time

On Fri, 9 Nov 2018 at 19:57, Kevin <mcgr...@gmail.com> wrote:

Just add the line manually to your input file

&DEVC ID=..., QUANTITY=... /

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