Conferences

BBAA7 PROCEEDINGS
Authors
Paper title
K.Hourigan, M.Brøns, M.C.Thompson, T.Leweke Bluff body vorticity generation and wake transitions
M.Matsumoto Flutter and Its Application - Flutter mode and Ship Navigation
A.Kareem, T.Wu Wind induced effects on bluff bodies in turbulent flows:nonstationary, non-Gaussian and nonlinear features
G.Diana, G.Fiammenghi Wind tunnel tests and numerical approach for long span bridges: the Messina bridge
J.Xie Aerodynamic optimization in super-tall building designs
S.Hernandez,F.Nieto,J.Jurado,I.Pérez Bluff body aerodynamics of simplified bridge decks for aeroelastic optimization
S.Lee,S.H.Kang,J.G.Yoon,S.D Kwon Reynolds number effects on aerodynamics forces of Kwangyang Bridge girder
Z.Zhang Superposability of the unsteady aerodynamic loads on bridge deck sections
M.Liu,Z.Q.Chen The influences of sectional parameters to aerodynamic performances of H-section hangers
S.Stoyanoff et al. Messina strait bridge - confirmatory wind tunnel testing of the bridge towers
T.Ma,L.Zhao,S.Cao,Y.Ge Aerodynamic effects on streamline box girder in active wind tunnel with multiple fans and vibrating airfoils
K.Xu,L.Zhao,S.Cao,Y.Ge Investigation of spatial coherences of aerodynamic loads on a streamlined bridge deck under active-generated flow conditions
H.Katsuchi,H.Yamada,K.Hasegawa Analytical study on lateral-torsional buckling of long-span suspension bridge
I.Kalkman,J.Franke,
A.Bronkhorst and C.Bentum
A comparison of RANS computations and wind tunnel tests for RMS pressures on a high-rise building model
Y.Zhou,Y.Q.Li,Z.Y.Shen and Y.Tamura Numerical estimation of added mass for circular membrane vibrating in still air
P.PHUC,T.NOZU,K.NOZAWA,H.KIKUCHI A Numerical Study of the Effects of Moving Tornado-Like Vortex on a Cube
J.Zhang,Q.Yang,Q.S.Li Application of nonlinear eddy viscosity model in simulations of flows over bluff body
N.Jorgensen,H.Koss,J.C.Bennetsen Embedded-LES and experiment of turbulent boundary layer flow around a floor-mounted cube
X.SUN,Z.CHEN,Y.WU and S.SHEN Numerical studies on the behaviors of wind-structure interaction for membrane structures
D.Gu,H.C.Lim Wind flow around rectangular obstacles and the effects of aspect ratio
E.Dragomirescu,Y.Tun Flow conditions for aerolastic stability of modular slender structures
P.Sangchuwong,H.Yamada,H.Katsuchi Study on turbulence effects on flow patterns around rectangular cylinders
X.Ying,F.Xu,Z.Zhang Numerical simulation and visualization of flow around rectangular bluff bodies
T.Lipecki,J.Bec,E.Blazik-Borowa Surface pressures on rectangular cylinders – the dependence on aspect ratio, wind structure and angle of wind attack
C.Borri,S.Zhou,Z.Chen Coupling investigation on Vortex-induced vibration and Galloping of rectangular cylinders
S.Zhang,Z.Zhu Numerical Simulation with PCA analysis of flow around 1:5 rectangular cylinder
Q.Zhou,S.Cao,Z.Zhou Shear effects on flow past a rectangular cylinder with side ratio B/D=5
M.Belloli,F.Fossati,S.Giappino,
S.Muggiasca,F.Robustelli
Turbulence intensity effect on the bluff bodies aerodynamic behavior
B.Qian,X.Hu,C.Hu The pressure distribution characteristics of a typical bluff section model
L.Zhao,A.P.Lu,L.D.Zhu,S.Y.Cao,Y.J.Ge Radial distribution of typhoon pressure fields measured by ground multi-point pressure distribution
M.MATSUI,T.OHKUMA,Y.TAMURA Evaluation of time history of design wind speeds and directions using typhoon model and empirical wind speed ratio
S.Y.Zhang,K.Nishijima Statistics-based investigation on typhoon transition modeling
S.S.Lee,G.Kim Statistical representation of typhoons in northwest pacific basin 
Y.Tamura,A.Katsumura Universal equivalent static wind load for structures
A.Katsumura,Y.Tamura,O.Nakamura For practical use of universal equivalent static wind load
Y.X.Yang,Y.Ge Wind-induced vibrations and equivalent static wind loading for cable-stayed bridges
S.T.Ke,L.Zhao,Y.J.Ge Coupling effects of resonant components of aerodynamic loads acted on hyperbolic spacial structures
H.Liao,Q.Suo,Q.Wang Study on the empirical mathematical model of nonlinear motion-induced aerodynamic force of bridge girder
L.D.Zhu,X.L.Meng,Z.S.Guo A novel empirical non-linear model for vortex-induced force on a closed box bridge deck
S.Liu,YaojunGe A new unsteady aerodynamic model with unique parameters
L.Carassale,T.Wu,A.Kareem Non-linear buffeting and flutter analysis of bridges:a frequency domain approach
K.Jung,H.S.Lee,H.K.Kim Frequency- and Time-domain Aeroelastic Analysis of Cable-Supported Bridges using Approximated Aerodynamic Transfer Functions
T.Wu,A.Kareem Comparison of various modeling schemes for bridge aerodynamics and aeroelasticity
Z.Guo,Y.Ge A new state-space model for self-exited forces and straight forward analysis of bridge deck flutter
T.Abbas,G.Morgenthal Hybrid models for assessing the flutter stability of suspension bridges
Y.Hui,A.Yoshida,Y.Tamura Interference effect on local peak pressure between two high-rise buildings with rectangular shape
N.Han,M.Gu,P.Huang Interference effect on wind pressure of two buildings
D.Wang,Y.Zhou,Q.Li,X.Deng,Y.Zhu Numerical study on wind-pressure characteristics of a high-rise building in group of buildings
A.Bronkhorst,C.Geurts,
B.Blocken,C.Bentum
Peak pressure effects on a high-rise building influenced by a mid-rise building
Y.Tang,X.Jin,L.Yang Research on interference effects of wind loads on tall buildings in staggered arrangement in staggered arrangement
Z.HAN,D.ZHOU,X.GUI Flow past two tandem circular cylinders using Spectral element method
F.Nagao,M.Noda,M.Inoue,S.Matsukawa Properties of wake excitation  in tandem circular cyclinders with several kinds of surface roughness
L.WANG,S.LIANG,H.TANG,W.SONG Investigation on wind tunnel blockage effect of super high-rise building
T.Lipecki2,J.Bec,E.Blazik-Borowa The response of aeroelastic models of circular cross-sections to wind action
K.Kimura,K.Kato,Y.Kubo Aeroelastic response of an inclined circular cylinder in smooth and turbulent flow
D.ZHOU,J.TU,Y.BAO Two degrees of freedom flow-induced vibrations on a cylinder
T.HE,D.ZHOU Vortex-induced vibrations of a flexible circular cylinder based on the CIBC method
D.Zuo,J.Hua Full-scale measurement of wind pressure on the surface of a circular cylinder
T.Takeuchi,J.Maeda,K.Otsubo,Y.Shuto Unsteady wind force on an elliptic cylinder subjected to a short-rise-time gust from steady flow
J.Wong,J.Kriegseis and D.Rival Understanding rapid flow separation with spanwise variation
S.Khurana,K.Suzuki,E.Rathakrishnan Effect of vortex-size around spike root and body base on possible hypersonic drag reduction
T.Wu2,A.Kareem,S.Li Excitation mechanism of rain-wind induced vibration of cables: unsteady and nonlinear aspects
W.L.Chen,S.Tang,H.Li,F.Li,H.Hu Influence of dynamic properties and position of rivulet on rainwind-induced vibration of stay cables
Q.Liu,Y.Wang,Y.Zheng,W.Ma Experimental study on the relation of water rivulet-Reynolds number effect-cable vibration
Z.Zhu Along-wind self-excited forces of two-dimensional cables under extreme wind speeds
G.Matteoni,C.T.Georgakis Aerodynamic force coefficients of plain bridge cables in wet conditions
K.Kleissl,C.Georgakis Comparison of several innovative bridge cable surface modifications
S.Kwon,H.Lee,S.Lee,J.Kim Dynamic wind actions on catwalk structures
H.Matsumiya,T.Nishihara Wind tunnel tests for simulating large-amplitude, low-frequency galloping on overhead transmission lines
A.Zasso,G.Diana,L.Rosa,A.Pagani,S.Stoyanoff,
P.Dallaire,E.Vullo,D.Khazem,K.Serzan
Validation analyses of integrated procedures for evaluation of stability, buffeting response and wind loads on the Messina Bridge
T.H.Le,Y.Tamura Unsteady buffeting prediction of bridges using proper orthogonal decomposition
X.Chen Prediction of buffeting response of long span bridges to transient nonstationary winds
X.Che,J.Li,D.Zhang  Wind tunnel test and the analysis of buffeting performance of free-standing tower of cable-stayed bridge under yaw wind
R.Dong,Y.Ge,Y.Yang Accurate equivalent static wind loads of lang-span bridges based on the displacement responses
W.HAN,A.CHEN,J.LI,J.LIU Verification of time-domain buffeting theory and analysis of influence factors for long-span cable-stayed bridges
ZhouQ.,L.D.Zhu,P.J.Ren Measurements of equivalent aerodynamic admittances of two separate and parallel bridge decks
L.Carassale2,A.Freda,
M.Marrè-Brunenghi,G.Solari
Effects of terrain proximity on the aeroelastic response of a bridge deck
Y.Yan,Y.Tang,X.Jin Research on combination coefficient of cross and torsional wind forces for high-rise buildings based on the copula method
H.Cao,Y.Quan,M.Gu,D.Wu Along-wind aerodynamic damping of high-rise buildings
E.Bernardini,S.Spence,
M.Gioffrè,A.Kareem 
A reliability approach for the wind-induced response assessment of tall buildings using the high frequency force balance
G.Hu,Q.S.Li The effects of freestream turbulence on wind-induced responses of tall buildings
A.Yoshida,B.Kumar,
Y.Tamura,Y.Kim,Q.Yang
Experimental investigation on aerodynamic characteristics of various triangular-section high-rise buildings
G.Huang,X.Chen Tall building response evaluation to nonstationary winds based on multiple simulated samples
L.Caracoglia A state-space model for the wind-induced response of tall buildings with errors in the lateral loading
K.Kwok,Y.He,M.Poty Computational study of wind-fire-structure interactions and their impact on bushfire resistance design of housing
L.Huang,H.Liao,Y.L.Xu Nonlinear aerodynamic forces on square section: numerical study
N.Rostamy2,J.F.McClean,
D.Sumner,D.J.Bergstrom,J.D.Bugg
Flow above the free end of a surface-mounted square prism
T.Arslan,G.Khoury,
B.Psttersen and H.Andersson
Simultations of flow around a three-dimensional square cylinder unsing LES and DNS
Y.Tatewaki,J.Kanda,H.Kikitsu,Y.Lo Wind pressure characteristics of square prism under non-stationary wind in multiple-fan wind tunnel
Z.Hosseini,J.A.Bourgeois,R.J.Martinuzzi Wall-mounted finite cylinder wake structure modification due to boundary layer-wake interaction: Half-loop and full-loop coherent structure topologies
L.Carassale3,A.Freda,
M.Brunenghi,G.Piccardo,G.Solari
Experimental investigation on the aerodynamic behavior of square cylinders with rounded corners
H.Wang POD analysis of the finite-length square cylinder wake
Z.W.Zhang,Y.Quan,M.Gu,N.Tu,X.Yong Effects of corner recession modification on aerodynamic coefficients of square tall buildings
H.Kikumoto,R.Ooka Large-eddy simulation of reactive pollutant dispersion in a street canyon using a subgrid scale variance model of concentration field
M.Chavez,T.Stathopoulos,A.Bahloul CFD modelling of flow and dispersion in the built environment:different RANS models and a first attempt to use URANS
S.Sabatino,R.Buccolieri,P.Salizzoni Recent advancement from flow and dispersion studies around bluff bodies for urban environment applications
P.Moonen,V.Dorer,J.Carmeliet Large Eddy Simulation of concentration fluctuations in an urban street canyon
C.Wevers,R.Höffer Physical and numerical modelling of dust dispersion in the leeward zone of two single-standing buildings
Y.Tominaga and G.Lin CFD simulations of pollutant gas dispersion with different buoyancies around an isolated building 
P.Gousseau2, B.Blocken, G.Heijst Analysis of unsteady concentration and flow statistics around an isolated building by Large-Eddy Simulation
J.Jurado,R.Sánchez,
S.Hernández,F.Nieto,I.Kusano
A review of cases of vortex shedding excitation in bridges: Sectional models testing
X.Weng,Y.Ge,H.Chen A new approach to identifying aeroelastic parameters in nonlinear vortex induced force model
M. Li,Y.Sun,H. Liao

Vortex-induced vibration prediction of long-span bridges considering imperfect correlation of aerodynamic forces

A.Corriols2,M.Astiz,A.Barrero Experimental study of vortex-induced vibrations on H-shaped sections
Q.Guan,J.Li,C.Guo,J.Liu,X.Xing Effects of balusters on vortex-induced vibration of a bluff bridge deck section
S.Laima,H.Li,W.Chen Investigation of vortex-induced vibration of twin box girders
X.Cui,J.Li,J.Liu Experimental study on vortex resonance of streamline-like
Z.Q.Chen,X.Hua,W.Chen,Z.Huang Multi-mode vortex-induced vibration of a long rectangular shallow beam 
D.L.Zuo,D.A.Smith,K.C.Mehta Benchmark wind tunnel study of wind loading on rectangular sign structures
X.Ortiz,A.Hemmatti,D.Rival,D.Wood   Instantaneous forces and moments on inclined flat plates
M.Belloli2,D.Rocchi,L.Rosa,A.Zasso Wind tunnel studies on the effects of porous elements on the aerodynamic behavior of civil structures
J.Bec,T.Lipecki,E.Blazik-Borowa Aerodynamic coefficients for iced lattice tower models
J.Bec2,T.Lipecki,E.Blazik-Borowa Wind tunnel measurements of aeroelastic guyed mast models
C.Nguyen,A.Freda,
G.Piccardo,G.Solari,F.Tubino 
Aeroelastic behavior of complex lighting poles and antenna
F.Kemper,M.Feldmann Design Wind Loads of Wire Mesh Claddings and their Fatigue Behavior considering Structural Non-Linearities
Y.Dai,X.Yan,X.Wang,SUN H.,Li Y. Statistics and analysis of typhoons landing and failure mechanism of coastal low-rise buildings in China
Q.S.Li,S.Y.Hu,Y.M.Dai Field measurements of wind loads on an instrumented low-rise building during typhoons and comparison with wind tunnel test results
X.Wang,P.Huang,M.Gu Field measurement of wind loads on low-rise building with adjustable roof pitch
M.Elsharawy,T.Stathopoulos and K.Galal Wind-induced torsional aerodynamic loads on low and medium height buildings
X.K.Jing,Y.Q.Li Wind pressure acting on flat roofed buildings
T.K.Guha,Sharma R.N.,Richards P.J. Internal pressure in real flexible porous buildings: A design perspective
X.Yu,Y.Quan,M.Gu  Coupled vibration between wind-induced internal pressures and large span roof for a two-compartment building with openings
G.Sabareesh,M.Matsui,Y.Tamura Ground roughness effects on internal pressures and local roof wind forces of building exposed to tornado-like flow
Y.Kim,A.Yoshida,Y.Tamura,H.Kikuchi,K.Hibi Numerical simulation of pressure and flow field in large group of low-rise buildings
H.Li,J.Ou Experimental simulation of downburst-generated wind loading on building structure
M.Haines,M.Sterling,A.Quinn The simulation of non-synoptic effects for wind damage studies
R.Pratt and G.Kopp An initial study of the aerodynamics of photovoltaic panel arrays mounted on large flat-roofs
F.Takeda,T.Yoshino,Y.Uematsu Discussion of design wind force coefficients for hyperbolic paraboloid free roofs
F.Wang,Y.Tamura,A.Yoshida,R.Okada Wind force characteristics of scaffoldings with sheets
C.Bentum,I.Kalkman,C.Geurts Towards a better understanding of pressure equalization
T.Tsurumi,J.Katagiri,T.Ohkuma Wind force and wind-induced vibration characteristics of slender beam with angle cross-section
Y.Wang,J.Chen,H.C.Lee,K.M.Li Accurate simulations of surface pressure fluctuations and flow-induced noise near bluff body at low mach numbers
G.Szab,M.Pálossy,L.Szecsányi Three-dimensional forced oscillation technique in flutter assessment
L.Li,Y.Ge,G.Dai Probability evaluation of flutter failure for long-span bridges
D.Yang,Y.Ge,H.Xiang Influences of local vibrations of cables on flutter behaviors of cable-stayed bridges
Q.Wang,H.Liao The nonlinear aerodynamic stability of long-span bridges: post flutter
K.Makihara Eco-generation of energy from flutter based on energy- ecycling  echanism
H.Song,S.Lee,B.Ku,J.Eum,S.Kwon Wind energy harvesting at elevated bridges
J.McCarthy,A Deivasigamani,
S.atkins,S.J.John,F.Coman
A parametric study of wind-induced flutter of piezoelectric patches for energy harvesting
Richards P.J.,Norris S.E. The flight of roofing tiles during strong winds
C.Gromke Modeling vegetation in Wind Engineering wind tunnel studies
Y.Yang,Tim K.T.Tse,X.Jin,L.Yang and M.Gu A numerical tree canopy model and its application in computational wind engineering simulation
J.Cao,Y.Tamura,A.Yoshida Aerodynamic characteristics of trees for green roofing systems
F.Fang,C.C.Liang,J.Y.Chung,
C.Y.Yen,Y.C.Li,C.H.Chen
Numerical simulation of flow past discrete coniferous trees
T.Gilbert,C.Baker,A.Quinn,M.Sterling Aerodynamics of high-speed trains in confined spaces
Li Y.,Xiang H.,Wu M.,Qiang S. Wind loads and coupling vibration of wind-vehicle-bridge system in the process of two trains passing each other
Xiang H.,Li Y.,Chen N.,Liao H. Wind tunnel test study the influence of wind screen on wind pressure distribution above railway tracks
F.Dorigatti,A.D.Quinn,
M.Sterling,C.J.Baker
Evaluation of crosswind effects on rail vehicles through moving model experiments
F.Nieto,S.Hernández,
I.Kusano,J.Jurado
CFD aerodynamic assessment of deck alternatives for a cable-stayed bridge
Z.W.Liu,Z.Chen,S.Cai Two dimensional numerical simulations of vortex-induced vibration responses of H-shaped bridge deck 
C.Chu,C.Huang,T.Wu,C.Wang Numerical simulation of hydrodynamic loading on  submerged rectangular bridge decks
H.Zhan,T.Fang Flutter  stability  studies  of  Great  Belt East Bridge and Tacoma Narrows Bridge by CFD numerical simulation
X.Liu,Z.Chen,Z.Liu Direct simulation method for flutter stability of bridge deck
A.Corriols,G.Morgenthal Computational analysis of VIV observed on existing bridges
W.Ding,M.Nakamura,
S.Tanaka,Y.Uematsu
Unsteady aerodynamic forces on long-span curved roof
Z.Ding,Y.Tamura,A.Yoshida Internal stresses in cladding support members of long-span arched roof under wind load
Y.Chen,G.Liu,B.Sun Moving downburst effects on long-span roof structure
Y.SUN,Y.WU and S.Z SHEN  Database-assisted design for large span roofs
J.R.Wu,C.C.Dong,A.Xu,J.Y.Fu Structural optimization of long span portal-rigid frames under wind action
Y.Lo,J.Kanda Cross spectra of wind pressures on domed roofs in boundary layer wind tunnel
X.X.Cheng,L.Zhao,Y.J.Ge Wind-induced static performance of cooling tower considering multiple loading effects
X.P.Liu,L.Zhao,Y.J.Ge Extreme value distribution of surface aerodynamic pressure of hyperbolic cooling tower
T.Hu,R.Yoshie Ventilation efficiency indices for evaluating ventilation performance of newly-built urban area
H.Kikugawa,T.Goto,Y.Yonezawa,
N.Sekishita and K.Toshimitsu 
Characteristics of flow and temperature field along a heated street canyon in the multiple-fan turbulence wind tunnel
J.Jiao,R.Yoshie Large-eddy simulation of flow around obstacle arrays using drag force method of gas-solid two-phase flow
A.Razak,N.Ikegaya,A.Hagishima,J.Tanimoto Numerical investigation of urban geometry impact on pedestrian wind environment
B.Blocken,T.Defraeye,
E.Koninckx,J.Carmeliet,P.Hespel
RANS and LES simulations of the interference drag of  two cyclists
H.Montazeri,B.Blocken,
W.D.Janssen,T.van Hooff
CFD analysis of wind comfort on high-rise building balconies: validation and application
P.Gousseau,B.Blocken,G.J.F.van Heijst On validation and solution verification of Large-Eddy Simulation of wind flow around a high-rise building
Y.Xue Study on characteristics of ore storage-pile fugitive-dust based on wind tunnel experiments
S.Y.Cheng,M.Tsubokura,
T.Nakashima,Y.Okada,T.Nouzawa
Aerodynamic stability of road vehicles in dynamic motion
Y.Liu,H.Hemida,Z.Liu Large Eddy Simulation of the flow around a train passing a stationary freight wagon
B.Wang,Y.Xu,L.D.Zhu,Y.L.Li Determination of aerodynamic characteristics of a vehicle immerged in the wake of bridge tower using computational fluid dynamics
S.Salvadori,T.Morbiato,A.Mattana,E.Fusto On the characterization of wind profiles generated by road traffic
Y.Han,S.C.S.Cai,Z.Chen,J.Hu,C.Li Wind tunnel measurements of aerodynamic forces on vehicles and bridges under crosswinds
H.F.Wang,M.Xu Control of the aerodynamic drag of Ahmed model with slot jet
J.Park,H.K.Kim,S.J Kim Flow measurement of vortex-induced vibration of parallel bridge girders by PIV
Z.Taylor,R.Gurka,G.Kopp Simultaneous PIV/pressure measurements of the flow around elongated bluff bodies
A.Jong,A.Bronkhorst,
C.Geurts and C.Bentum 
PIV and pressure measurements on two high-rise models in tandem arrangement
N.Rostamy,J.McClean,D.Sumner,
D.Bergstrom,J.Bugg 
Local flow field of a surface-mounted finite square prism
L.Cheng,K.M.Lam Unsteady features of bluff body wake with application to building wake length
H.Kawai,Y.Okuda and M.Ohashi Structure of conical vortex on and behind a cube in smooth and turbulent flows
K.Kumar,C.Cini,V.Sifton Assessment of design wind speeds for metro cities of India
Q.Yang,Y.Tian,B.Li and B.Chen Statistical spectrum model of wind velocity at Beijing Meteorological Tower
W.Chen,L.Song,A.Liu,S.Zhi Amplification effect of rough underlying surface on the strong wind parameters at typhoon eye wall
Y.HE,P.W.CHAN,Q.S.LI Wind profiles from a Sodar system under hilly terrain
G.Rosi,R.Martinuzzi,D.Rival A Conditional Analysis of Roller Vortices within the Atmospheric Log Layer
R.Yoshie,M.Mochizuki Regeneration of occurrence frequencies and vertical profiles of wind velocity by WRF calculation 
E.Tomokiyo,K.Otsubo,
J.Maeda,Y.Shuto
CFD Prediction of gusty winds corresponding to observed values around mountainous terrain
Z.Liu,T.Ishihara Effects of the swirl ratio on the turbulent flow fields of tornado-like vortices by using LES turbulent model
T.WANG,S.CAO,Y.GE Generation of inflow turbulence using the local differential quadrature method
F.Xu,X.Ying,Z.Zhang,W.Lou 3-D LES numerical simulation researches on wind flows interfered by rough waves
P.Hu,Y.Li,H.Liao Appropriate shape of boundary transition section of terrain model for mountains-gorge bridge site
B.Yan,Q.S.Li Inflow turbulence generation for LES of wind flow around bluff body
C.Yin,T.Wu,A.Kareem Turbulence simulation in wavelet domain based on Log-Poisson model: univariate and multivariate wind processes
K.Nozawa,T.Tamura Coupling method of WRF-LES and LES based on scale similarity model
Y.ONO,T.Tamura LES of local severe suction on side faceof a three-dimensional square cylinder
M.YOSHIKAWA,T.TAMURA LES for wind load estimation by unstructured grid system
Y.Maruyama,T.Tamura,
Y.Okuda,M.Ohashi
LES of fluctuating wind pressure on a 3D square cylinder for PIV-based inflow turbulence
T.Tamura,T.Nozu Introduction of unstructured-grid system on LES for wind pressure estimation on a building in cities