## 5 Results and Discussion  
To carry out test calculations and the possibility of further validation of the algorithm, we used the scenarios from [61]. During the modeling process, three types of forest fires were considered. A surface forest fire of low intensity, characterized by a low front height, about 1 m and a low propagation speed of 0.015 m/s over a layer of ground forest fuel. For the second type, a surface forest fire of high intensity, was adopted that fire was characterized by a higher flame height of about 1.5 m and an increased propagation velocity of 0.05 m/s. The main distinguishing feature of a high-intensity surface forest fire from a low-intensity one is that of a high-intensity fire. The increased height of the flame leads to an increase in the speed of movement of the forest fire front. The last type is a crown forest fire, the height of the flame reaches the height of the tree crowns. Due to the greatly increased height of the flame, the propagation speed increases and is 0.33 m/s. A thin wall with a thickness of 0.02 m was considered as the enclosing structure. This thickness was adopted because the heating of wood during a fire does not occur by more than 0.02 m [61; 68]. A low-intensity forest fire front starts to move at a distance of 20 m from the enclosing structure. The material of construction is plywood. The front speed  
Figure 9: Total running time of the algorithm depending on the number of processes. is set at 0.015 m/s, the flame height is 1 m. The estimated time is 425 s. The calculation results are shown in Figure 10.  
A high-intensity surface forest fire front starts to move at a distance of 20 m from the enclosing structure. The material of construction is plywood. The front speed is set to 0.05 m/s, the flame height is 1.5 m. The estimated time is 350 s. The calculation time is recorded less; in our discussion of the results it is described in detail why this is so. The calculation results are shown in Figure 11.  
Figure 11: Impact of a surface forest fire (high intensity) on plywood from a distance of 20 m—temperature distribution along the wall thickness. Figure 10: Impact of a surface forest fire (low intensity) on plywood from a distance of 20 m—temperature distribution along the wall thickness. The front of the crown forest fire begins to move at a distance of 20 m from the enclosing structure. The material of construction is plywood. The front speed is set to 0.33 m/s, the flame height is from 1 m to 10 m. The estimated time is 50 s. The calculation results are shown in Figure 12.  
A low-intensity surface forest fire front begins to move at a distance of 20 m from the enclosing structure. The material of construction changes for each calculation. The front speed is set to 0.015 m/s, the flame height is 1 m. The estimated time is 425 s. The calculation results are shown in Figure 13.  
A high-intensity surface forest fire front starts to move at a distance of 20 m from the enclosing structure. The material of construction changes for each calculation. The front  
Figure 12: Impact of a crown forest fire on plywood from a distance of 20 m for different facade heights (from 1 to 10 m). Figure 13: Impact of surface forest fires (low intensity) on various materials from a distance of 20 m in 425 s of exposure—temperature distribution over the wall thickness. speed is set at 0.05 m/s, the flame height is 1 m. The estimated time is 350 s. The calculation results are shown in Figure 14.  
The effect of paint and varnish coatings was found to be small, the temperature difference on the surface was about 2 \({}^{\circ}\)C. The data on the absorption coefficients of radiant energy for various paints are used in civil engineering. Data are given on unpainted wood species, dark gray paint, white and blue paint, and also on a straw-colored surface [62]. The material is considered as a material made of plywood. As a result of numerous computational experiments, similar to [61] patterns of the impact of forest fires on the enclosing structures of a wooden building were obtained.