If the number of meshes is less than or equal to the number of logical processors, then a process is started for each mesh and the solution proceeds. How PyroSim Currently Runs MPIīy default, when the user clicks Run FDS Parallel in PyroSim, PyroSim compares the number of meshes with the number of logical processors. This post does contain useful information for users who want additional background on MPI or who want to manually assign specific meshes to processes. This issue was addressed in PyroSim 2020.3 so most users can use the default Run FDS Parallel option with satisfactory solution times.
During that time period, if a model had more meshes than available processors and the user selected the default Run FDS Parallel option, the last processor would be assigned all excess meshes and solution times would be long. In order not to affect the safety of personnel evacuation, the width of exit doors should be no less than 3 m and stair width should be no less than 1.75 m.This post addressed a problem that occurred with in FDS and PyroSim for versions 2019.1 through 2020.2.
Pathfinder simulation results show that the best time to escape is within 164.8s. When all windows are opened, rooms above are more seriously influenced by the smoke. Horizontal corridors and stairs are more seriously influenced by the smoke. With window closed, the fire origin room temperature and heat flow are much higher than with window open while the smoke layer height is much lower. The closer to the fire source, the lower the visibility. The results show that, with all windows opened, the highest temperature area is the fire origin room and the fire floor temperature is higher than the other floors.
This paper has analyzed the temperature, visibility, smoke layer height, heat flow, and smoke movement with all windows and doors opened and compared these with conditions when the fire origin room had closed windows. To analyze the fire risk in dormitory buildings, one dormitory of a university was taken as the subject to build a model using Pyrosim.
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