Thesis supervisor: Gergely Kristóf
Location of studies (in Hungarian): Department of Fluid Mechanics Abbreviation of location of studies: ÁT
Description of the research topic:
a.) Antecedents:
Urban air quality at street level is determined by firstly intensity of pollution sources, and secondly by turbulent mixing in urban boundary layer among and above the buildings. The mixing process is particularly limited in densely populated urban areas due to the aerodynamic drag force on high-rise buildings being in tight arrangement, although high population density also generates substantial social and economic benefits.
b.) Aim of research:
To find building configurations favorable for pollution dilution without decreasing the valuable indoor space, in particular the following optimization question is posed:
How could a given useful building volume be arranged over a given surface area for achieving the highest ventilation performance?
Identification of further thermodynamic or aerodynamic methods for enhancing transport intensity is also part of the investigation.
c.) Tasks, main items, necessary time:
Computational Fluid Dynamics will be the main platform of analysis. This will be the primary research focus in the first 4 semesters. Wind tunnel measurements and out-door measurements will be used for validating CFD models as well as for proving superior performance of the optimized solutions. This will take 3 additional semesters which also includes the preparation of 2 major publications. One additional semester is necessary for the formulation of thesis points and writing PhD thesis. The recommended duration of the research project is 4 years.
d.) Required equipment:
The necessary computing facility (PC cluster) and the wind tunnel laboratory will be made available for the research by the Department of Fluid Mechanics of BME.
e.) Expected scientific results:
New analysis methods, exploration of geometrical and thermal effects on urban air quality, establishing new urban planning rules.
f.) References:
Kristóf G, Rácz N, Balogh M, Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems, BOUNDARY-LAYER METEOROLOGY (ISSN: 0006-8314) 131: pp. 85-103. (2009)
Rákai A, Kristóf G, Franke J, Sensitivity analysis of microscale obstacle resolving models for an idealized Central European city center, Michel-Stadt, IDŐJÁRÁS / QUARTERLY JOURNAL OF THE HUNGARIAN METEOROLOGICAL SERVICE (ISSN: 0324-6329) 118: (1) pp. 53-77. (2014)
Aniko Rakai, Gergely Kristof: Microscale Obstacle Resolving Air Quality Model Evaluation with the Michelstadt Case, THE SCIENTIFIC WORLD JOURNAL 2013: pp. 1-11. pp. 1-11.
Racz N, Kristof G: Implementation and validation of a bulk microphysical model of moisture transport in a pressure based CFD solver, IDŐJÁRÁS / QUARTERLY JOURNAL OF THE HUNGARIAN METEOROLOGICAL SERVICE 120: (2) pp. 231-254.
Required language skills: English Number of students who can be accepted: 1
Deadline for application: 2017-10-19
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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