This application developed by Kristopher Overholt (www.koverholt.com). The original scripts can be found on his github account here. I am maintaining the scripts after the author decided to stop hosting them.

About this tool

This tool allows you to easily generate a MESH line for input into Fire Dynamics Simulator (FDS). It automatically calculates the optimal (Poisson-friendly) mesh division numbers and returns a complete MESH line to be used in an FDS input file. The cell sizes are determined using the characteristic fire diameter and cell size ratio that should accurately resolve your fire simulation based on the total heat release rate.


The cell size (dx) for a given simulation can be related to the characteristic fire diameter (D*), i.e., the smaller the characteristic fire diamater, the smaller the cell size should be in order to adequately resolve the fluid flow and fire dynamics.

The characteristic fire diameter (D*) is given by the following relationship:

A reference within the FDS User Guide (Verification and Validation of Selected Fire Models for Nuclear Power Plant Applications. NUREG 1824, United States Nuclear Regulatory Commission, 2007) used a D*/dx ratio between 4 and 16 to accurately resolve fires in various scenarios. From the FDS User Guide: “These values were used to adequately resolve plume dynamics, along with other geometrical characteristics of the models as well. This range does not indicate what values to use for all models, only what values worked well for that particular set of models.”

For more information, see the FDS User Guide.

Tutte le presenti applicazioni sono state realizzate da terze parti. Non sono state oggetto di modifica e sono state rese disponibili in quanto l’autore principale (KRISTOPHER OVERHOL) le ha rese disponibili (github) dopo averle tolte dal sito personale. FSEng Ingegneria Antincendio di Ing. Andrea Quarta non si assume nessuna responsabilità riguardo all’uso di qualsiasi applicazione presente su questo sito o su Www.fseng-antincendio.it Nel caso in cui l’autore non vorrà renderle più disponibili ci rendiamo disponibili alla veloce cancellazione di queste applicazioni. Ogni professionista che le utilizzerà sarà consapevole che dovrà verificare esso stesso i risultati assumendosene la responsabilità. Ogni professionista che utilizzerà le presenti applicazioni, implicitamente da consenso a non ritenere FSEng Ingegneria Antincendio di Ing. Andrea Quarta responsabile in alcun modo di eventuali danni di qualsiasi natura causati direttamente o indirettamente dal loro utilizzo.

All these applications were made by third parties. They have not been modified and have been made available as the main author (KRISTOPHER OVERHOL) made them available (github) after having removed them from the personal site. FSEng Ingegneria Antincendio di Ing. Andrea Quarta assumes no responsibility for the use of any application on this site or on Www.fseng-antincendio.it In the event that the author does not want to make them available, we make ourselves available to quickly delete these applications. Every professional who uses them will be aware that he will have to verify the results himself and take responsibility for them. Any professional who will use these applications, implicitly gives consent not to hold FSEng Ingegneria Antincendio di Ing. Andrea Quarta responsible in any way for any damage of any nature caused directly or indirectly by their use.