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The air pollution problem inevitably accompanies our human activities. Severe air pollution situations have been reported, especially in emerging countries, and satisfying the air quality standards fully remains an underlying issue. Today, modeling research is one of the more valuable approaches to understanding the behavior of air pollutants, and is useful for regulation-, policy- and decision-making. Such modeling applications range, with regard to horizontal grid resolution, from a few km (local) to hundreds of km (regional), to thousands of km (global). To foster our current scientific knowledge on modeling potentialities and limitations, scientific research related to multi-scale air pollution modeling is collected in this book.

Environmental science, engineering & technology --- Urban pollution --- Street canyon --- Nitrate aerosol --- CFD --- Air quality --- open burning --- biomass burning --- sugarcane crops --- environmental assessment --- air quality modeling --- chemical reaction model --- urban canyon --- radiation --- mesoscale models --- reactive pollutants --- Community Multiscale Air Quality (CMAQ) --- East Asia --- Tokyo --- SO42– --- stabilized Criegee intermediates (SCI) --- wildfire plume rise --- smoke modeling --- large eddy simulation --- emissions dispersion --- WRF-SFIRE --- RxCADRE --- RePLaT-Chaos --- large-scale atmospheric advection --- chaotic advection --- stretching rate --- escape rate --- education --- CMAQ --- PM10 --- atmospheric reanalysis --- PM2.5 --- PM2.5 components --- three-dimensional chemical transport model --- model inter-comparison --- urban scale --- secondary particles --- WRF-Chem --- visibility --- eastern China --- neural network algorithm --- IMPROVE --- n/a --- SO42 --- -stabilized Criegee intermediates (SCI)

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The air pollution problem inevitably accompanies our human activities. Severe air pollution situations have been reported, especially in emerging countries, and satisfying the air quality standards fully remains an underlying issue. Today, modeling research is one of the more valuable approaches to understanding the behavior of air pollutants, and is useful for regulation-, policy- and decision-making. Such modeling applications range, with regard to horizontal grid resolution, from a few km (local) to hundreds of km (regional), to thousands of km (global). To foster our current scientific knowledge on modeling potentialities and limitations, scientific research related to multi-scale air pollution modeling is collected in this book.

Environmental science, engineering & technology --- Urban pollution --- Street canyon --- Nitrate aerosol --- CFD --- Air quality --- open burning --- biomass burning --- sugarcane crops --- environmental assessment --- air quality modeling --- chemical reaction model --- urban canyon --- radiation --- mesoscale models --- reactive pollutants --- Community Multiscale Air Quality (CMAQ) --- East Asia --- Tokyo --- SO42 --- -stabilized Criegee intermediates (SCI) --- wildfire plume rise --- smoke modeling --- large eddy simulation --- emissions dispersion --- WRF-SFIRE --- RxCADRE --- RePLaT-Chaos --- large-scale atmospheric advection --- chaotic advection --- stretching rate --- escape rate --- education --- CMAQ --- PM10 --- atmospheric reanalysis --- PM2.5 --- PM2.5 components --- three-dimensional chemical transport model --- model inter-comparison --- urban scale --- secondary particles --- WRF-Chem --- visibility --- eastern China --- neural network algorithm --- IMPROVE --- Urban pollution --- Street canyon --- Nitrate aerosol --- CFD --- Air quality --- open burning --- biomass burning --- sugarcane crops --- environmental assessment --- air quality modeling --- chemical reaction model --- urban canyon --- radiation --- mesoscale models --- reactive pollutants --- Community Multiscale Air Quality (CMAQ) --- East Asia --- Tokyo --- SO42 --- -stabilized Criegee intermediates (SCI) --- wildfire plume rise --- smoke modeling --- large eddy simulation --- emissions dispersion --- WRF-SFIRE --- RxCADRE --- RePLaT-Chaos --- large-scale atmospheric advection --- chaotic advection --- stretching rate --- escape rate --- education --- CMAQ --- PM10 --- atmospheric reanalysis --- PM2.5 --- PM2.5 components --- three-dimensional chemical transport model --- model inter-comparison --- urban scale --- secondary particles --- WRF-Chem --- visibility --- eastern China --- neural network algorithm --- IMPROVE

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The book contains the research contributions belonging to the Special Issue "Numerical Simulation of Wind Turbines", published in 2020-2021. They consist of 15 original research papers and 1 editorial. Different topics are discussed, from innovative design solutions for large and small wind turbine to control, from advanced simulation techniques to noise prediction. The variety of methods used in the research contributions testifies the need for a holistic approach to the design and simulation of modern wind turbines and will be able to stimulate the interest of the wind energy community.

Technology: general issues --- large-scale wind turbine balde --- computational aeroacoustics --- sound source detection --- low Mach number turbulent flows --- NACA0012 airfoil --- fluid-structure interaction --- wind turbine --- atmospheric boundary layer --- composite materials --- gusts --- wind energy --- actuator line method --- wind turbine simulation --- regularization kernel --- small wind turbine (SWT) --- computational fluid dynamics (CFD) --- composites --- fluid-structure interaction (FSI) --- VAWT --- gurney flap --- CFD --- RBF --- power augmentation --- Darrieus --- turbulence --- experiments --- turbine wake --- turbine size --- large-eddy simulation --- actuator surface model --- wind turbine wake --- actuator disk model --- dynamic mode decomposition --- coherent structures --- wake meandering --- vertical axis wind turbine (VAWT) --- Savonius turbine --- deformable blades --- power coefficient --- blade load --- fluid-structure interaction (FSI) --- uncertainty quantification --- blade damage --- AEP --- winglet --- computational fluid dynamics (CFD), wind energy --- renewable energy --- rotor blade --- tip vortices --- aerodynamics --- ansys fluent --- savonius turbine --- icewind turbine --- static torque --- three-dimensional simulation --- Delayed DES --- H-Darrieus --- micro wind power generation --- wind turbine control --- load mitigation --- individual pitch control --- lifting line free vortex wake --- vortex methods --- pitch --- stall --- engineering codes --- large-scale wind turbine balde --- computational aeroacoustics --- sound source detection --- low Mach number turbulent flows --- NACA0012 airfoil --- fluid-structure interaction --- wind turbine --- atmospheric boundary layer --- composite materials --- gusts --- wind energy --- actuator line method --- wind turbine simulation --- regularization kernel --- small wind turbine (SWT) --- computational fluid dynamics (CFD) --- composites --- fluid-structure interaction (FSI) --- VAWT --- gurney flap --- CFD --- RBF --- power augmentation --- Darrieus --- turbulence --- experiments --- turbine wake --- turbine size --- large-eddy simulation --- actuator surface model --- wind turbine wake --- actuator disk model --- dynamic mode decomposition --- coherent structures --- wake meandering --- vertical axis wind turbine (VAWT) --- Savonius turbine --- deformable blades --- power coefficient --- blade load --- fluid-structure interaction (FSI) --- uncertainty quantification --- blade damage --- AEP --- winglet --- computational fluid dynamics (CFD), wind energy --- renewable energy --- rotor blade --- tip vortices --- aerodynamics --- ansys fluent --- savonius turbine --- icewind turbine --- static torque --- three-dimensional simulation --- Delayed DES --- H-Darrieus --- micro wind power generation --- wind turbine control --- load mitigation --- individual pitch control --- lifting line free vortex wake --- vortex methods --- pitch --- stall --- engineering codes

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The demand for computational fluid dynamics (CFD)-based numerical techniques is increasing rapidly with the development of the computing power system. These advanced CFD techniques are applicable to various issues in the industrial engineering fields and especially contribute to the design of fluid machinery and fluid devices, which have very complicated unsteady flow phenomena and physics. In other words, to aid the rapid development of CFD techniques, the performances of fluid machinery and fluid devices with complicated unsteady flows have been enhanced significantly. In addition, many persistently troublesome problems of fluid machinery and fluid devices such as flow instability, rotor–stator interaction, surging, cavitation, vibration, and noise are solved clearly using advanced CFD techniques.This Special Issue on “CFD-Based Research and Applications for Fluid Machinery and Fluid Devices” aims to present recent novel research trends based on advanced CFD techniques for fluid machinery and fluid devices. The following topics, among others, are included in this issue:- CFD techniques and applications in fluid machinery and fluid devices;- Unsteady and transient phenomena in fluid machinery and fluid devices;- Pumps, fans, compressors, hydraulic turbines, pump turbines, valves, etc.

Technology: general issues --- centrifugal fan --- noise characteristics --- power consumption --- negative pressure --- sound pressure --- mechanical seal --- dynamic characteristics --- extrusion fault --- numerical simulation --- sealing performance --- fluent --- inducer --- step casing --- varying pitch --- cavitating flow and instabilities --- partial similarity principle --- flow similarity --- stability improvement --- multi-condition optimization --- cavitation performance --- artificial neural networks (ANN) --- net positive suction head (NPSH) --- double suction --- cascade --- aerodynamic --- parameterization --- plane cascade design --- incidence angle --- PSO-MVFSA --- optimization --- two-vane pump --- Computational Fluid Dynamics (CFD) --- Reynolds-averaged Navier-Stokes (RANS) --- machine learning --- energy recovery --- pump as turbine --- vortex --- hydraulic losses --- pressure fluctuation --- transient characteristics --- centrifugal pump --- startup period --- solar air heater --- ribs --- Nusselt number --- friction factor --- Reynolds-averaged Navier-Stokes equations --- thrust coefficient --- power coefficient --- figure of merit --- frozen rotor --- UAV --- octorotor SUAV --- aerodynamic performance --- rotor spacing --- hover --- CFD --- vortices distribution --- shape optimization --- Francis turbine --- fixed flow passage --- flow uniformity --- blade outlet angle --- Sirocco fan --- URANS --- volute tongue radius --- internal flow --- noise --- film cooling --- large eddy simulation --- triple holes --- blowing ratio --- adiabatic film-cooling effectiveness --- proper orthogonal decomposition --- axial compressor --- tip clearance --- flow field --- clearance --- flow function --- gas turbine --- leakage --- pressure ratio --- stepped labyrinth seal --- axial-flow pump --- root clearance radius --- computational fluid dynamics --- entropy production --- energy dissipation --- vortex pump --- lateral cavity --- open-design --- spiral flow --- reactor coolant pump (RCP) --- waviness --- leakage rate --- liquid film --- axial fan --- reversible --- jet --- design --- thrust --- energy characteristics --- mixing --- pitched blade turbine --- impeller --- inverse design method --- matching optimization --- diffuser --- small hydropower --- tubular turbine --- fish farm --- performance test --- design factors --- optimum model --- the mixed free-surface-pressurized flow --- characteristic implicit method --- relative roughness --- vent holes --- optimization control --- microchannel heat sink --- wavy microchannel --- groove --- heat transfer performance --- laminar flow --- multi-objective optimization --- LHS --- full factorial methods --- pump-turbine --- dynamic stress --- start-up process --- vortex generator (VG) --- computational fluid dynamics (CFD) --- cell-set model --- RANS --- LES --- multistage centrifugal pump --- double-suction impeller --- twin-volute --- inducer-type guide vane --- trailing edge flap (TEF) --- trailing edge flap with Micro-Tab --- deflection angle of the flap (αF) --- centrifugal fan --- noise characteristics --- power consumption --- negative pressure --- sound pressure --- mechanical seal --- dynamic characteristics --- extrusion fault --- numerical simulation --- sealing performance --- fluent --- inducer --- step casing --- varying pitch --- cavitating flow and instabilities --- partial similarity principle --- flow similarity --- stability improvement --- multi-condition optimization --- cavitation performance --- artificial neural networks (ANN) --- net positive suction head (NPSH) --- double suction --- cascade --- aerodynamic --- parameterization --- plane cascade design --- incidence angle --- PSO-MVFSA --- optimization --- two-vane pump --- Computational Fluid Dynamics (CFD) --- Reynolds-averaged Navier-Stokes (RANS) --- machine learning --- energy recovery --- pump as turbine --- vortex --- hydraulic losses --- pressure fluctuation --- transient characteristics --- centrifugal pump --- startup period --- solar air heater --- ribs --- Nusselt number --- friction factor --- Reynolds-averaged Navier-Stokes equations --- thrust coefficient --- power coefficient --- figure of merit --- frozen rotor --- UAV --- octorotor SUAV --- aerodynamic performance --- rotor spacing --- hover --- CFD --- vortices distribution --- shape optimization --- Francis turbine --- fixed flow passage --- flow uniformity --- blade outlet angle --- Sirocco fan --- URANS --- volute tongue radius --- internal flow --- noise --- film cooling --- large eddy simulation --- triple holes --- blowing ratio --- adiabatic film-cooling effectiveness --- proper orthogonal decomposition --- axial compressor --- tip clearance --- flow field --- clearance --- flow function --- gas turbine --- leakage --- pressure ratio --- stepped labyrinth seal --- axial-flow pump --- root clearance radius --- computational fluid dynamics --- entropy production --- energy dissipation --- vortex pump --- lateral cavity --- open-design --- spiral flow --- reactor coolant pump (RCP) --- waviness --- leakage rate --- liquid film --- axial fan --- reversible --- jet --- design --- thrust --- energy characteristics --- mixing --- pitched blade turbine --- impeller --- inverse design method --- matching optimization --- diffuser --- small hydropower --- tubular turbine --- fish farm --- performance test --- design factors --- optimum model --- the mixed free-surface-pressurized flow --- characteristic implicit method --- relative roughness --- vent holes --- optimization control --- microchannel heat sink --- wavy microchannel --- groove --- heat transfer performance --- laminar flow --- multi-objective optimization --- LHS --- full factorial methods --- pump-turbine --- dynamic stress --- start-up process --- vortex generator (VG) --- computational fluid dynamics (CFD) --- cell-set model --- RANS --- LES --- multistage centrifugal pump --- double-suction impeller --- twin-volute --- inducer-type guide vane --- trailing edge flap (TEF) --- trailing edge flap with Micro-Tab --- deflection angle of the flap (αF)

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• Reference Manager
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The demand for computational fluid dynamics (CFD)-based numerical techniques is increasing rapidly with the development of the computing power system. These advanced CFD techniques are applicable to various issues in the industrial engineering fields and especially contribute to the design of fluid machinery and fluid devices, which have very complicated unsteady flow phenomena and physics. In other words, to aid the rapid development of CFD techniques, the performances of fluid machinery and fluid devices with complicated unsteady flows have been enhanced significantly. In addition, many persistently troublesome problems of fluid machinery and fluid devices such as flow instability, rotor–stator interaction, surging, cavitation, vibration, and noise are solved clearly using advanced CFD techniques.This Special Issue on “CFD-Based Research and Applications for Fluid Machinery and Fluid Devices” aims to present recent novel research trends based on advanced CFD techniques for fluid machinery and fluid devices. The following topics, among others, are included in this issue:- CFD techniques and applications in fluid machinery and fluid devices;- Unsteady and transient phenomena in fluid machinery and fluid devices;- Pumps, fans, compressors, hydraulic turbines, pump turbines, valves, etc.

centrifugal fan --- noise characteristics --- power consumption --- negative pressure --- sound pressure --- mechanical seal --- dynamic characteristics --- extrusion fault --- numerical simulation --- sealing performance --- fluent --- inducer --- step casing --- varying pitch --- cavitating flow and instabilities --- partial similarity principle --- flow similarity --- stability improvement --- multi-condition optimization --- cavitation performance --- artificial neural networks (ANN) --- net positive suction head (NPSH) --- double suction --- cascade --- aerodynamic --- parameterization --- plane cascade design --- incidence angle --- PSO-MVFSA --- optimization --- two-vane pump --- Computational Fluid Dynamics (CFD) --- Reynolds-averaged Navier-Stokes (RANS) --- machine learning --- energy recovery --- pump as turbine --- vortex --- hydraulic losses --- pressure fluctuation --- transient characteristics --- centrifugal pump --- startup period --- solar air heater --- ribs --- Nusselt number --- friction factor --- Reynolds-averaged Navier–Stokes equations --- thrust coefficient --- power coefficient --- figure of merit --- frozen rotor --- UAV --- octorotor SUAV --- aerodynamic performance --- rotor spacing --- hover --- CFD --- vortices distribution --- shape optimization --- Francis turbine --- fixed flow passage --- flow uniformity --- blade outlet angle --- Sirocco fan --- URANS --- volute tongue radius --- internal flow --- noise --- film cooling --- large eddy simulation --- triple holes --- blowing ratio --- adiabatic film-cooling effectiveness --- proper orthogonal decomposition --- axial compressor --- tip clearance --- flow field --- clearance --- flow function --- gas turbine --- leakage --- pressure ratio --- stepped labyrinth seal --- axial-flow pump --- root clearance radius --- computational fluid dynamics --- entropy production --- energy dissipation --- vortex pump --- lateral cavity --- open-design --- spiral flow --- reactor coolant pump (RCP) --- waviness --- leakage rate --- liquid film --- axial fan --- reversible --- jet --- design --- thrust --- energy characteristics --- mixing --- pitched blade turbine --- impeller --- inverse design method --- matching optimization --- diffuser --- small hydropower --- tubular turbine --- fish farm --- performance test --- design factors --- optimum model --- the mixed free-surface-pressurized flow --- characteristic implicit method --- relative roughness --- vent holes --- optimization control --- microchannel heat sink --- wavy microchannel --- groove --- heat transfer performance --- laminar flow --- multi-objective optimization --- LHS --- full factorial methods --- pump-turbine --- dynamic stress --- start-up process --- vortex generator (VG) --- computational fluid dynamics (CFD) --- cell-set model --- RANS --- LES --- multistage centrifugal pump --- double-suction impeller --- twin-volute --- inducer-type guide vane --- trailing edge flap (TEF) --- trailing edge flap with Micro-Tab --- deflection angle of the flap (αF) --- n/a --- Reynolds-averaged Navier-Stokes equations