Numerical simulation and experimental study on stack-gas dispersion emitted from different elevated point source in an urban environment
Other Title(s)
المحاكاة العددية و الدراسة التجريبية لانتشار الغازات المنبعثة من ارتفاعات مختلفة في بيئة حضرية
Author
Source
Assiut University Bulletin for Environmental Researches
Issue
Vol. 10, Issue 1 (31 Mar. 2007), pp.35-58, 24 p.
Publisher
Assiut University Center for Environmental Studies and researches
Publication Date
2007-03-31
Country of Publication
Egypt
No. of Pages
24
Main Subjects
Earth Sciences, Water and Environment
Topics
Abstract AR
أجريت هذه الدراسة بغرض تطوير مفهوم ظاهرة انتشار الملوثات من مصادر مرتفعة حول عوائق مختلفة الارتفاعات بالنسبة للمداخن في بيئة حضرية.
و قد تم محاكة ظروف الانتشار باستعمال نماذج ديناميكيا السوائل الحسابية.
كما تم دراسة الظواهر عمليا في نفق الانتشار الهوائي تحت ظروف حرارية مختلفة لتقييم دقة تنبؤ انتشار الغازات.
و قد أثبتت الدراسة أنه يوجد اتفاقا بين نتائج استخدام نماذج المحاكاة العددية، و تلك التي تم الحصول عليها عمليا، كما تبين أن الحالة الغير مستقرة أعلى من الحالات المحايدة و المستقرة.
و وجد أن تركيز التشتت للنموذج المكعب أعلى من نموذج الصحي.
Abstract EN
The flow and dispersion of stack-gas emitted from different an elevated point source around flow obstacles in an urban environment have been investigated theoretically using computational fluid dynamics models (CFD) and experimentally in the diffusion wind tunnel under different condition of thermal stability using a tracer gas technique without buoyancy.
The flow and dispersion fields in the boundary layer in an urban environment were examined at different flow obstacle.
Gaseous pollutant is discharged in the simulated boundary layer over the flat area.
The CFD models used for the simulation were based on the steady-state Reynolds-Average Navier-Stoke equations (RANS) with κ-ε turbulence models; standard κ-ε and RNG κ-ε models.
The flow and dispersion data measured in the wind tunnel experiments were compared with the results of the CFD models in order to evaluate the prediction accuracy of the pollutant dispersion.
The results of the CFD models wind tunnel experiments showed good agreement with the results of the wind tunnel experiments.
The obtained results indicate that the turbulent velocity is reduced by the obstacles models, and the maximum dispersion appears around the wake region of the obstacles.
Moreover, these results are used to validate the corresponding Gaussian dispersion model prediction.
American Psychological Association (APA)
Yasin, Muhammad Fathi. 2007. Numerical simulation and experimental study on stack-gas dispersion emitted from different elevated point source in an urban environment. Assiut University Bulletin for Environmental Researches،Vol. 10, no. 1, pp.35-58.
https://search.emarefa.net/detail/BIM-276519
Modern Language Association (MLA)
Yasin, Muhammad Fathi. Numerical simulation and experimental study on stack-gas dispersion emitted from different elevated point source in an urban environment. Assiut University Bulletin for Environmental Researches Vol. 10, no. 1 (Mar. 2007), pp.35-58.
https://search.emarefa.net/detail/BIM-276519
American Medical Association (AMA)
Yasin, Muhammad Fathi. Numerical simulation and experimental study on stack-gas dispersion emitted from different elevated point source in an urban environment. Assiut University Bulletin for Environmental Researches. 2007. Vol. 10, no. 1, pp.35-58.
https://search.emarefa.net/detail/BIM-276519
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 56-57
Record ID
BIM-276519