The screws were placed under the angles equal to 45 and 90 degrees relatively to the direction of fibres of the timber layers. The compliant timber-concrete joint was provided by the screws with diameter and length equal to 4 and 40 mm, correspondingly.
Dimensions of the crushed granite pieces changes within the limits from 2 to 25 mm. The rigid timber-concrete joint was provided by the pieces of crushed granite, which were strengthened on the surface of the timber boards by epoxy glue Sica Dur 330. The small-scale hybrid timber-concrete specimens consists from the layers of cement base finishing mass Sacret BAM and timber boards of strength class C24 with thicknesses equal to 25 and 18 mm, correspondingly. Small scale hybrid timber-concrete specimens with the length, width and thickness equal to 400, 95 and 43 mm were investigated for case of three points bending. Behaviour of timber-concrete rigid and compliant joints were evaluated numerically and by experiment for the members subjected to flexure. PyroSim does nothing special to run a single mesh case.Possibility to develop rigid timber-concrete joint for hybrid timber-concrete specimens was stated. Also, if you run FDS, single mesh, from PyroSim and get a different result than you do at the command line, you might want to check your FDS version. I am running the latest code base, so your results might be slightly different. In your case, you seem to be using both strategies, but with the left wall, you are creating a problem. However, if you want to open and close doors and windows, provide about 1 m of distance between the wall and the exterior of the domain, and specify OPEN boundary conditions on the exterior. If you are only interested in simulating the interior of an enclosure, the exterior boundary of the domain can serve as the external wall of the enclosure. You then open or close a door by removing or adding an obstruction.
Your left wall abuts the exterior boundary of the computational domain.
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