Thunderhead Engineering Forum

Public Forum => Pathfinder => Topic started by: Murtaza Wasi on April 20, 2021, 12:23:35 am

Title: Visibility Threshold for tenability assesment
Post by: Murtaza Wasi on April 20, 2021, 12:23:35 am
For manually coupling FDS results with Pathfinder to introduce the speed reduction factor (https://support.thunderheadeng.com/tutorials/pathfinder/manually-coupling-fds/) it is also mentioned in the Summary section that a user can choose to completely prevent entry to a room by closing doors as an alternate way for incorporating the effects of visibility in movement. But no value of visibility is prescribed as critical or threshold at/below which the doors are to be closed. Is there any particular value for this or any reference works/studies that can guide us through this problem?
Title: Re: Visibility Threshold for tenability assesment
Post by: Bryan Klein on May 21, 2021, 03:56:15 pm
There is not a specific threshold, this would be up to engineering judgement.

There is a newer feature in Pathfinder to have agent automatically slow down in smoke.
https://support.thunderheadeng.com/docs/pathfinder/2021-2/user-manual/#_importing_fds_output_data
https://support.thunderheadeng.com/docs/pathfinder/2021-2/technical-reference-manual/#_occupant_slowing_in_smoke

They will not avoid smoke yet, and doors won't close to prevent movement through a smoke filled room.