Our primary references for FDS implementation and experimental validation are: The FDS User’s Guide ( McGrattan et al. In particular, we want to ensure that the new PyroSim Results Viewer correctly reads FDS results and displays smoke correctly.

In this post we aim to describe and present some background on how visibility and obscuration are calculated in FDS, the core computation engine used in PyroSim.

The calculated visibility is often used as an occupant tenability requirement, while obscuration is used to display smoke visually. Visibility is the distance that an observer can identify an object relative to the background and obscuration is the amount that light intensity is reduced as it passes through smoke. The comparison of VTT experimental images with predicted smoke visualization using PyroSim/FDS shows remarkably good correlation. This post reviews how visibility is calculated in FDS, compares the calculation to experimental data, and discusses how smoke is visualized in the new PyroSim Results Viewer and in Smokeview.

Smoke visibility and obscuration are critical outputs of a fire simulation. To follow along with this tutorial, download the relevant files here. VTT Experimental Validation of Visibility One drink ticket and light appetizers included in meeting fee.Created with software version: 2020.1 Table of Contents This presentation will touch on many of the new features in both programs, some interesting applications of these tools and an overview of challenges we face moving forward.Īfter the meeting, we will have a happy hour at Looney’s Pub. Updates to FDS and the implementation of user requests in PyroSim, along with the expanding scope of human movement and process simulation capabilities in Pathfinder, require a continuous effort in research and development from Thunderhead Engineering. Please join us for our November technical meeting followed by a social event for Chapter members, friends and guests.įirst, Bryan Klein, Product Manager with Thunderhead Engineering, will present Recent Updates and Development Plans for PyroSim, Pathfinder and Related Technologies.

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