## 7 Summary and Conclusions  
The article carried out a detailed analysis of the influence of various factors on the obtained pressure values in fifteen characteristic places (A-O) of a residential building, as well as maximum and minimum values. Research was carried out to select the optimal size of the virtual wind tunnel, which, with the lowest possible hardware computing power consumption, allows for obtaining results independent of the influence of boundary conditions. The numerical model reflects the real tunnel (in laboratory conditions) but is also an alternative to it. It allows, with less time and costs, to analyze the impact of wind speed on pressure in various places of the research object. Considerations can also have the opposite effect. Finding the correct (optimal in terms of size) dimensions of wind tunnels may influence the selection of solutions when building real tunnels. The article created several models that differed from each other in terms of the parameters of the numerical model created in the computational program. Initially, twenty models with constant wind speeds, C1-C20, were created, and then, based on the most optimal one, an additional three with higher speeds, C21-C23. The shape and dimensions of the wind tunnel (C1-C12), the location of the facility (C13-C16), and the influence of the duration of the load (C17-C20) were considered. These are just some of the output parameters that can be edited during the construction of the numerical model. Based on the results obtained, presented in tables and graphs, we can present the following conclusions:  
* The results of the obtained pressures, both positive and negative, differ significantly depending on the parameters used: the shape and dimensions (lateral and longitudinal) of the wind tunnel. The initial results were disturbed by the interference of the initial stream and the wave reflected from the building and tunnel walls, which resulted in values of 1473 Pa (C4 model), while the expected value was at the level of 322-325 Pa. Subsequent models created to eliminate the influence of boundary conditions reduced these stresses gradually from 574 Pa (C5 model) to the expected value of 321 Pa (C16 model). * The location of the tested object (introducing the ground level on which the building is built) (C14 and C16 models) affects not only the pressure values obtained in characteristic places (corners of the object) but also the maximum pressure (pressure on the windward wall). We can analyze the difference in results with one variable (location on the ground) by comparing model C13 versus C14, a decrease from 394 Pa to 296 Pa (24.87%), and C15 versus C16, a decrease from 520 Pa to 321 Pa (38.26%). * There is a specific (i = 200), easily achievable number of iterations of the computational process (corresponding to the passage of time), after which the impact on the results can be considered negligible. The results can be analyzed by comparing C13 versus C17, an increase from 394 Pa to 428 Pa (8.63%), then C14 versus C18, the value does not change 296 Pa, then C15 versus C19, an increase from 520 Pa to 523 Pa (0.57%), and C16 relative to C20, an increase from 321 Pa to 327 Pa (1.87%). * It is clearly visible that smaller cross-sections (C1-C4) (average 1181 Pa) significantly overestimate the obtained results due to the concentration of stresses between the model and the tunnel wall. In the next 4 models (C5-C8) (average 564 Pa), the results are normalized, and only in the last part, we obtain reliable results close to the expected value of 320 Pa.
* The shape of the cross-section has a much smaller impact on the values than the size and, above all, the surface corresponding to the free space around the object. The results can be analyzed by comparing models C1-C4 among themselves, then C5-C8 among themselves, and C9-C12 among themselves. * With a large increase in the cross-section parameters (case C16), it is possible to achieve values independent of the boundary disturbances.