File:Fse-mesh-resolution-v2.svg

Fse-mesh-resolution-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 11 KB)

Summary

Relative discretisation error and computing time of a second-order model compared with a 0.1 m grid. Based on McGrattan (2007), p. 5-1.

Original illustration for Mesh resolution, level 4 Expert.

Source basis: McGrattan (2007), p. 5-1 (error proportional to the square of the cell size; halving gives one quarter of the error and 16 times the computing time); McGrattan et al. (2026), p. 47 (time step tied to cell size by the CFL condition)
Alt text: Log chart: as cells shrink from 0.4 m to 0.025 m, relative error falls from 16 to 0.06 while relative computing time rises from 0.004 to 256.

New drawing by Fire Safety Academy. © Fire Safety Academy.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:36, 2 November 2026		900 × 600 (11 KB)	Jan (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Short title	Relative discretisation error and computing time of a second-order model compared with a 0.1 m grid. Based on McGrattan (2007), p. 5-1.
Image title	Log chart: as cells shrink from 0.4 m to 0.025 m, relative error falls from 16 to 0.06 while relative computing time rises from 0.004 to 256. Source basis: McGrattan (2007), p. 5-1 (error proportional to the square of the cell size; halving gives one quarter of the error and 16 times the computing time); McGrattan et al. (2026), p. 47 (time step tied to cell size by the CFL condition)
Width	900
Height	600