Number of cells around a bund

[nina-1-2]

Hello,
I am modelling pool fires in a bund using PyroSim version 2026 and running on FDS6.
I did multiple tests to measure the radiation levels downwind of the fire performing sensitivities on the number of cells between the domain and edge of the bund/pool. I have added a scheme below to ease understanding of the variation on the number of cells between the border of the basins and domain.

As I was not able to find a guidance in FDS user guide, I was wondering if there was a minimum number of cells/distance to consider on FDS between the domain and obstacles (in this case the edge of the bund/pool) to avoid inconsistencies in the results?

[drjfloyd]

Converting to a discussion.

[drjfloyd]

There is no one size fits all answer for grid resolution. The way to determine if you have adequate grid resolution is to perform a grid study.

[nina-1-2]

Thank you !