Journal of Researches in Islamic Architecture

Abstract
Traditional geometric patterns in architecture and decoration are rooted in the cultural identity of each region and in cities such as Dezful, they display its special cultural and identity characteristics. In Dezful, the geometric patterns of the bricks, known as the khavoon chini are one of the hallmarks of the citychr('39')s cultural identity. Due to the hot climate of Dezful, the architects used hollow walls with the mentioned patterns to shade with climatic purposes. The traditional styles created in each region are the result of the experience of people who tried to create the best performance for the buildings of the region by using local elements and materials. As in Dezful, by using bricks and geometric patterns, in addition to creating special decorative elements of the region (khavoon chini), they have been thinking of creating shade in the high temperature of the city. The important point is that the thermal behavior of these patterns has not been compared and how in contemporary architecture these patterns can improve the thermal performance of walls is unknown. This study tries to revive the cultural identity of the region by using traditional geometric patterns such as khavoon chini, to provide a solution to improve the thermal behavior of hollow shaded walls and by examining the thermal behavior of these designs, to suggest an optimal model that revives the cultural identity of the city. , Have a good performance in terms of climate. The research method of this research is a combined method that in addition to historical interpretive studies, includes experimental and simulation methods. First, with the help of library and field studies, geometric patterns and native patterns were studied and classified, and then the thermal behavior of these patterns on the outer wall of the double-walled wall was analyzed by simulation. In this research, simulations were performed with Energy Plus software. The results showed that the use of traditional patterns in order to revive cultural identity in the form of geometric facades, has a very good climatic performance and reduce the indoor temperature by several degrees in the warmer months of the year. The type of geometric pattern used in the outer wall, the climatic function of the walls is different and each role requires a specific function. Accordingly, cross patterns have performed better.
 
Research Method:
The research method of this research was combined and did not involve experimental research, simulation and case study strategies. Based on this, first the authorized, analytical and field library studies were performed and simulated by software energy. Geometric patterns as an independent variable, and thermal behavior of a double-walled wall as a dependent variable were studied in this study. In order to analyze the data as well as intervention in architecture, the simulation method was used (according to the literature). The simulations were performed by CTF calculation method and Energy Plus software version 8.2. Performance of Energy Plus software based on technical specifications including physical, introduction of its mechanical and electrical system using annual water data of the hour (target city), temperature information as well as cooling and heating load required for simulation and analysis and Also, with a limited definition in order to buy a limited title, do comfort in the desired calculations (Abolhassani et al., 2015: 107-118). For internal surface convective heat transfer calculations, the software TARP method is used, which is based on an algorithm developed by Walton (Walton, 1983). The DOE-2 method has also been used for calculations related to external surface convective heat transfer (Lawrence Berkeley Laboratory, 1994). Also, the validity and reliability of this software in the article (comparison of the thermal behavior of the walls of the southern thrombus with different geometric composition in the corridor spaces of Ahvaz) has already been proven (Rahaei, Rezaeizadeh, 1399: 2521-2531).
 
Conclusion:
As shown in three diagrams 7, 8 and 9, the three models proposed in this study (Figures 1 to 3) can well control the thermal behavior of external walls and their conversion into double-walled walls will have very positive effects. These three proposed models have been very close to each other, but considering that the cross model has performed better than the other models by one degree in the hottest month of the year, so this model can be selected as the superior model. As a result, it will prove that, contrary to popular belief, motion patterns are much more influential in the thermal behavior of khavoon chini models than the degree of knot and complexity in each model. Therefore, according to the simulations that were performed and according to the results obtained from the proposed model and the real patterns in the old texture, for Dezful climate, which usually makes the building to the southwest, the cross pattern is proposed, which will provide better performance. This method as a passive method has many effects on climate performance in both hot and cold seasons and is recommended to revive the cultural identity of Dezful and improve climatic performance as well as improve the thermal behavior of the walls of khavoon chini patterns as Use a passive method.

Abstract
Traditional houses are shaped to adapt to the climate and culture, with designers emphasizing internal airflow. Evidence indicates that the physical elements of the courtyard can influence the natural ventilation process of the spaces surrounding the central courtyard. The research question is: What is the airflow pattern inside the central courtyard of the Suzangar House in Dezful, and what impact does it have on cultural characteristics? This study aims to investigate the natural ventilation in the central courtyard of the Suzangar House, as a representative of the Qibla courtyard typology, under the influence of external winds. This enables, in addition to airflow pattern analysis, the identification of the relationship between this pattern and cultural features. The present study is applied and interdisciplinary. The research method is mixed: initially, after reviewing traditional houses with central courtyards, pattern recognition and classification based on the courtyard’s orientation and direction were conducted, and the Soozangar House was selected. The physical elements of the central courtyard (courtyard orientation) were considered as the independent variable, and the airflow circulation pattern inside the central courtyard (flow velocity and direction) was considered as the dependent variable. These were measured experimentally using a data logger device during the research testing period. Subsequently, the data were simulated and analyzed by Gambit pre-processor and ANSYS Fluent software (after validation and reliability confirmation) through Computational Fluid Dynamics (CFD) methods. Results indicate that Dezful’s traditional architecture, featuring central courtyards and spring porches (Baharkhab), supports activities around the central courtyard, which forms an integral part of Dezful’s cultural identity. The courtyard serves as a space for lighting, ventilation, and communication. The airflow inside the central courtyard forms a vortex pattern, providing adequate ventilation for the spring porches. Furthermore, considering the prevailing wind direction, the optimal building orientation is southeast with an approximate east-west elongation, which does not hinder airflow inside the building. The central courtyard, by fulfilling various roles in residents’ daily life, especially the spring porch as a gathering space influenced by the existing airflow, is recognized as a symbol of cultural identity. Attention to the presented results will improve the disorder and airflow circulation pattern inside the central courtyard, thereby enhancing more effective natural ventilation.

Research Method
The current research aims to investigate and analyze the behavior of the airflow inside the central courtyard and its surrounding spaces under the influence of outside wind in Dezful climate, under the influence of the architectural elements of the central courtyard to achieve the pattern of physical variables of native architecture for use in contemporary architecture. To achieve the purpose of the research, the following steps were taken: Considering the variety of houses in Dezful, according to the topic and purpose of the research, houses with a central courtyard were considered as a statistical population, among them, the Suzangar house was randomly selected and considering the amount access and the possibility of doing the next steps of the research were selected. Surveys and field observations were made in the test period using an experimental method from a case sample and their results were recorded. Dependent variables have been used by precise digital devices, i.e. thermometers and hygrometers. Then, after drawing the plans of the desired house, gridding was done with Gambit software and after defining the boundary conditions, numerical calculations and final simulations were done in Fluent software. Since the process of natural ventilation of these courtyards is considered in the research, therefore, the climatic performance of the central courtyards in question is only investigated from the point of view of natural ventilation.

Conclusion
In the typology of Dezful houses, most of these houses have thick walls and many semi-open spaces on the upper floors, and the hollow walls have good shading while maintaining privacy. According to the typology, the overall attention of the facade is toward the southeast to receive the right light and to avoid the west light. But the building method should be such that there is a possibility of natural ventilation and the composition of different spaces should facilitate it. Therefore, it is necessary to investigate this method of the building according to the direction of the building and the type of prevailing wind in order to determine the condition of internal airflow and natural ventilation. The first result obtained is that creating a movement path to enter the central courtyard and creating an entrance opening in the corner of the courtyard has helped to create a whirlwind flow in the middle of the courtyard. In other words, in the general state, regardless of the intensity and weakness in each state, after entering the alley leading to the entrance of the building, the wind enters from the corner of the yard and creates a vortex in the middle of the yard, which increases in height and passes through the terraces and the balcony of the building moves from the top of the building. Therefore, in general, we can conclude that the orientation and elongation of traditional houses in this climate cannot prevent the creation of airflow and natural ventilation, and in each of the prevailing wind conditions, there is airflow inside the house with different disturbances. In the meantime, based on the findings of the research, mode B has more optimal conditions during normal wind, if the wind is strong, option C is suggested.