Browsing by Author "Siddiqui, Faizan Pervez"

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Development of an accelerated Monte Carlo ray tracing based radiation heat transfer solver
(2017-07) Siddiqui, Faizan Pervez; Başol, Altuğ Melik; Başol, Altuğ Melik; Mengüç, Mustafa Pınar; Uğurdağ, Hasan Fatih; Kandemir, Melik; Ertürk, H.; Department of Electrical and Electronics Engineering; Siddiqui, Faizan Pervez
The Monte Carlo ray tracing (MCRT) is a semi-analytical stochastic method for the solution of radiative transfer equation (RTE). However, its high computation cost prevents its extensive use. In this study, an accelerated MCRT based radiation heat transfer solver has been developed that is capable of handling complex geometries in participating and nonparticipating medium with the capability of simultaneous 3d visualization of the results. Use of the graphic processors resulted in a 40x speed-up as compared to the modern high-end CPU's and an additional 10x speed-up is also achieved with the use of efficient data structures. The RTE is coupled with the energy equation in a way that the solver treats predefined critical regions very precisely while the remaining regions are solved with mediocre accuracy. Using this adaptive technique in the coupling of the equations, the error in the calculations has dropped by 5x compared to the standard MCRT method. The proposed method requires 1.5x more memory compared to the standard MCRT and does not have any penalty in terms of computational time.
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Introduction of a spatio-temporal mapping based POE method for outdoor spaces: Suburban university campus as a case study
(Elsevier, 2018-11) Göçer, Özgür; Göçer, K.; Başol, Altuğ Melik; Kıraç, Mustafa Furkan; Özbil, A.; Bakovic, M.; Siddiqui, Faizan Pervez; Özcan, Barış; Computer Science; Architecture; Mechanical Engineering; BAŞOL, Altuğ Melik; KIRAÇ, Mustafa Furkan; GÖÇER, Özgür; Siddiqui, Faizan Pervez; Özcan, Barış
Outdoor spaces are important to sustainable cities because they establish a common identity for social life by improving quality of urban living. The relation between outdoor spaces and building groups, competency, use period, and interaction of micro-climatic factors are needed to be investigated from a holistic approach. Unfortunately, the limited and narrow scoped POE studies on outdoor spaces make an overall assessment without causality relation. Other existing studies in outdoor spaces are mostly grouped under the headings such as; user satisfaction, space syntax and behavioral mapping, and biometeorological assessments. The intention of this paper is to introduce a new post-occupancy evaluation (POE) method integrates these studies focusing on various problems in outdoor spaces using spatio-temporal mapping. The comprehensive methodology applied in this research attempted to overcome some of the shortcomings of related studies by conducting a longitudinal study (during a year, as opposed to a few days) and also by objectively analyzing the associations of user behavior and physical attributes as well as the configurational properties of the campus layout. With this method, outdoor spaces can be evaluated in the context of the interaction between the physical environment and its users' behavior and activities, level of satisfaction and perceptions of comfort. The method has been applied on a suburban university campus in İstanbul, Turkey. The main courtyard of the campus has been subjected for map creation and result discussions.
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Segregated approach for the modeling of continuous heat treatment furnaces
(Begell House Inc., 2019-06) Siddiqui, Faizan Pervez; Menekşedağ, Kaan; Başol, Altuğ Melik; Mengüç, Mustafa Pınar; Mechanical Engineering; BAŞOL, Altuğ Melik; MENGÜÇ, Mustafa Pınar; Siddiqui, Faizan Pervez; Menekşedağ, Kaan
Accurate modeling of the transient material temperature distribution inside the continuous heat treatment furnaces are very critical in terms of adjusting the process parameters of the furnace operations. In this study the transient heating process inside the heating section of continuous glass annealing furnace is simulated using a segregated approach. Convective heat transfer inside the furnace is modeled using a steady-state solver in the Eulerian frame of reference and the transient conduction problem inside the moving glasses is using a separate transient solver in Lagrangian frame of reference. Radiation heat transfer between the glasses and the furnace is modeled using a graphics processor accelerated Monte Carlo ray tracing based surface-to-surface radiation model. The glass and furnace surfaces are taken as black in the considered scenario. The segregated approach is evaluated to be suitable as a modeling approach in terms of the convergence rate. Due to the fast convergence rate of the method and acceleration of the MCRT solver, the present heating process can be simulated in around 2 hours of computational time. Finally, the observed non-uniformity in the glass temperature distributions at the furnace outlet are quantified and the possible causes of this non-uniformity are discussed.