TY - CHAP AU - D, Greco AU - P, Pontelandolfo AU - T, Nour AU - R, Putzu ED - Longhurst, JWS ED - Brebbia, CA TI - Wind tunnel investigations of pollution dispersion in a scale model of a large area of the city. Geneva: WIT Transactions on Ecology and the Environment TS - Geneva: WIT Transactions on Ecology and the Environment T2 - Air Pollution XXII PB - WIT Press CY - Southampton SN - 9781845647827 T3 - WIT Transactions on Ecology and the Environment, ISSN 1743-3541 ; 183. PB - WIT Press PY - 2014 SP - 213 EP - 215 PG - 12 DO - 10.2495/AIR140181 UR - https://m2.mtmt.hu/api/publication/24542578 ID - 24542578 N1 - eISBN 978-1-84564-783-4 Megjegyzés-24542552 eISBN 978-1-84564-783-4 LA - English DB - MTMT ER - TY - JOUR AU - Kristóf, Gergely AU - Rácz, Norbert AU - Balogh, Miklós TI - Adaptation of Pressure Based CFD Solvers for Mesoscale Atmospheric Problems JF - BOUNDARY-LAYER METEOROLOGY J2 - BOUND-LAY METEOROL VL - 131 PY - 2009 IS - 1 SP - 85 EP - 103 PG - 19 SN - 0006-8314 DO - 10.1007/s10546-008-9325-7 UR - https://m2.mtmt.hu/api/publication/2644657 ID - 2644657 AB - General purpose Computational Fluid Dynamics (CFD) solvers are frequently used in small-scale urban pollution dispersion simulations without a large extent of ver- tical flow. Vertical flow, however, plays an important role in the formation of local breezes, such as urban heat island induced breezes that have great significance in the ventilation of large cities. The effects of atmospheric stratification, anelasticity and Coriolis force must be taken into account in such simulations. We introduce a general method for adapting pressure based CFD solvers to atmospheric flow simulations in order to take advantage of their high flexibility in geometrical modelling and meshing. Compressibility and thermal stratification effects are taken into account by utilizing a novel system of transformations of the field variables and by adding consequential source terms to the model equations of incompressible flow. Phenomena involving mesoscale to microscale coupled effects can be analyzed without model nesting, applying only local grid refinement of an arbitrary level. Elements of the method are validated against an analytical solution, results of a reference calculation, and a laboratory scale urban heat island circulation experiment. The new approach can be applied with benefits to several areas of application. Inclusion of the moisture transport phenomena and the surface energy balance are important further steps towards the practical application of the method. LA - English DB - MTMT ER - TY - JOUR AU - Lajos, Tamás AU - Goricsán, István AU - Régert, Tamás AU - Suda, Jenő Miklós AU - Balczó, Márton TI - Légszennyező anyagok terjedése városokban - A magas épületek hatása a légszennyezettségre JF - MAGYAR ÉPÍTŐIPAR J2 - MAGYAR ÉPÍTŐIPAR VL - 2008 PY - 2008 IS - 4 SP - 137 EP - 144 PG - 8 SN - 0025-0074 UR - https://m2.mtmt.hu/api/publication/2646046 ID - 2646046 N1 - http://www.ara.bme.hu/~suda/munka/PhD/PUBLIST/1_PDFs/2008_Lajos%20et%20al.%20%282008%29-Magyar%c9p%edt%f5ipar2008-4.pdf Megjegyzés-23992386 Magyar Építőipar HU ISSN 0025–0074 2008. 4. szám LVIII. évf., pp.137–144. AB - One of the most significant objectives of air pollution control is the reduction of concentration of traffic related pollutants in cities. These pollutants travel with air, so their dispersion depends basically on the characteristics of atmospheric flow field under urban canopy, influenced by buildings and vegetation. This study gives a short overview on building related flow structures influencing mainly the transport of pollutants then it describes the various mechanisms of the dispersion of pollutants in urban environment. One of the mechanisms significant from the point of view of air pollution control is the downflow close to the upstream front elevation of high buildings transporting clean air to pedestrian level. More significant is the effect of separation bubble developing over the downstream front elevation, lifting up the polluted air from the pedestrian level and transporting it in higher layers of atmosphere. The methods of investigation used in fluid mechanics: wind tunnel experiments and numerical simulation of flows are suitable not only for determination of wind forces but also for prediction of effect of buildings on air pollution and pedestrian wind comfort. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Lajos, Tamás AU - Goricsán, István AU - Lohász, Máté Márton AU - Régert, Tamás AU - Balczó, Márton TI - Városok légszennyezettségének, valamint épületek és szerkezetek szélterhelésének meghatározása szélcsatorna-vizsgálattal és az áramlás numerikus szimulációjával JF - GÉP J2 - GÉP VL - 2005 PY - 2005 IS - 1 SP - 3 EP - 8 PG - 6 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/23992385 ID - 23992385 N1 - GÉP, A Gépipari Tudományos Egyesület Műszaki Folyóirata ISSN 0016–8572, 2005/01. LVI. évf., pp.3–8. [8] Irodalomjegyzék tétel. LA - Hungarian DB - MTMT ER - TY - CONF AU - Goricsán, István AU - Balczó, Márton AU - Régert, Tamás AU - Suda, Jenő Miklós TI - Comparison of wind tunnel measurement and numerical simulation of dispersion of pollutants in urban environment T2 - Int. Conf. Urban Wind Engineering and Buildings Aerodynamics Impact of Wind and Storm on City Life and Built Environment PB - Von Karman Institute for Fluid Dynamics C1 - Brüsszel T3 - Int. Conf. Urban Wind Engineering and Buildings Aerodynamics PB - Von Karman Institute for Fluid Dynamics PY - 2004 SP - D6-1 EP - D6-10 UR - https://m2.mtmt.hu/api/publication/23992384 ID - 23992384 N1 - (ed. by J.P.A.J. van Beeck) COST C14 LA - English DB - MTMT ER -