Numerical Modelling Of Atmospheric Flows Over Complex Sites With Special Regard To The Forest Canopy
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Numerical Modelling Of Atmospheric Flows Over Complex Sites With Special Regard To The Forest Canopy
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Author : Asmae El Bahlouli-Öztürk
language : en
Publisher:
Release Date : 2021
Numerical Modelling Of Atmospheric Flows Over Complex Sites With Special Regard To The Forest Canopy written by Asmae El Bahlouli-Öztürk and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Numerical Modeling Of Atmospheric Boundary Layer Flow Over Forest Canopy
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Author : Konstantin Gavrilov
language : en
Publisher:
Release Date : 2011
Numerical Modeling Of Atmospheric Boundary Layer Flow Over Forest Canopy written by Konstantin Gavrilov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The work is dedicated to the investigation of the interaction between an Atmospheric Boundary Layer and a canopy (representing a forest cover). We have focused our attention to the complex problem of the generation and transformation of turbulent vortices over homogeneous, heterogeneous and sparse canopy. This problem has been studied using Large Eddy Simulation (LES) approach and High Performance Computing (HPC) technique.The numerical results reproduced correctly all the main characteristics of this flow, as reported in the literature: the formation of a first generation of coherent structures aligned transversally with the wind flow direction, the reorganization and the deformation of these vortex tubes into horse-shoe structures. The results obtained with the introduction of a discontinuity in the canopy (reproducing a clearing or a fuel break in a forest) are compared with the experimental data collected in a wind tunnel. In this case, the results confirmed the existence of a strong turbulence activity inside the canopy at a distance equal to 8 times the height of the canopy, referenced in the literature as the Enhance Gust Zone (EGZ) characterized by a local peak of the skewness factor. Then, the process of passive scalar transport from a forest canopy into a clear atmosphere is studied for two cases, i.e., when the concentration held by the forest canopy is either constant or variable. While this difference has little influence on the concentration patterns, results show that it has an important influence on the concentration magnitude as well as on the dynamics of the total concentration in the atmosphere.
Numerical Simulation Of Canopy Flows
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Author : Günter Groß
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Numerical Simulation Of Canopy Flows written by Günter Groß and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Starting with the description of meteorological variables in forest canopies and its parameter variations, a numerical three-dimentional model is developed. Its applicability is demonstrated, first, by wind sheltering effects of hedges and, second, by the effects of deforestation on local climate in complex terrain. Scientists in ecology, agricultural botany and meteorology, but also urban and regional lanners will profit from this study finding the most effective solution for their specific problems.
Numerical Modelling Of Atmospheric Boundary Layer Flows Over Complex Terrain
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Author : Massimiliano Burlando
language : en
Publisher:
Release Date : 2004
Numerical Modelling Of Atmospheric Boundary Layer Flows Over Complex Terrain written by Massimiliano Burlando and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Modelling Of Atmospheric Flow Fields
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Author : Demetri P Lalas
language : en
Publisher: World Scientific
Release Date : 1996-01-11
Modelling Of Atmospheric Flow Fields written by Demetri P Lalas and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-01-11 with categories.
This volume is a collection of lectures given at the two colloquia on atmospheric flows over complex terrain with applications to wind energy and air pollution, organized and sponsored by ICTP in Trieste, Italy. The colloquia were the result of the recognition of the importance of renewable energy sources, an important aspect which grows yearly as the environmental problems become more pronounced and their effects more direct and intense, while at the same time, the wise management of the Earth's evidently limited resources becomes imperative.It is divided into two main parts. The first, which comprises Chaps. 1 to 4, presents the structure of the atmospheric boundary layer with emphasis in the region adjacent to the ground. The second, Chaps. 5 to 10, discusses methods for the numerical computation of the wind field on an arbitrary terrain. The unique feature of this book is that it does not stop at the theoretical exposition of the analytical and numerical techniques but includes a number of codes, in a diskette, where the mechanisms and techniques presented in the main part are implemented and can be run by the reader. Some of the codes are of instructional value while others can be utilized for simple operational work.Some of the lecturers are: D N Asimakopoulos, C I Aspliden, V R Barros, A K Blackadar, G A Dalu, A de Baas, D Etling, G Furlan, D P Lalas, P J Mason, C F Ratto and F B Smith.
Modelling Of Atmospheric Flow Fields
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Author : Demetri P. Lalas
language : en
Publisher: World Scientific Publishing Company Incorporated
Release Date : 1996-01-01
Modelling Of Atmospheric Flow Fields written by Demetri P. Lalas and has been published by World Scientific Publishing Company Incorporated this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-01-01 with Science categories.
A Numerical Model Of Air Flow Through And Over A Forest Canopy
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Author : Zhen-jia Li
language : en
Publisher:
Release Date : 1982
A Numerical Model Of Air Flow Through And Over A Forest Canopy written by Zhen-jia Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Air flow categories.
Large Eddy Simulations Of Atmospheric Flows Over Idealized And Realistic Double Hill Terrain In The Wrf Model
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Author : Yayun Qiao
language : en
Publisher:
Release Date : 2020
Large Eddy Simulations Of Atmospheric Flows Over Idealized And Realistic Double Hill Terrain In The Wrf Model written by Yayun Qiao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Atmospheric circulation categories.
Airflow over complex terrain throughout the atmospheric boundary layer (ABL) governs the transport and mixing of mass, momentum, and heat. Topography causes obstruction of the airflow and generates airflow distortion and turbulence. Perturbations in land-atmosphere interactions cause various weather phenomena like cold-air pools (CAPs) leading to changes in many aspects of weather and climate that impact the optimal position of wind-turbine, forest-fire behavior, and forecasting, as well as trace-gas and pollutant dispersion. This thesis investigates the flow over complex terrain, specifically double-hill terrain, with new numerical model approaches. The first study utilizes the Weather Research and Forecasting (WRF) model with large eddy simulations (LES) and the immersed-boundary method (IBM) to improve the simulations of the flow and recirculation regions over steep double-hill terrain. The gap distance controls the flow distribution behind both hills. The upwind hill has a significant influence on the second hill. When the gap distance is too small, the flow after the upwind hill cannot regain its momentum. The second study examines the flow distribution over a forested double-hill and the impact of the gap distance between two hills on scalar transport (CO2 and H2O). This study uses the WRF-LES model coupled with a new multiple-layer canopy module (MCANOPY module). We find that flow recirculation is the primary factor dominating scalar transport. Scalars are transported and trapped in both recirculation regions and accumulated on the lee sides of both hills. Our simulation shows the occurrence of two vortices on the lee side of the upstream hill enhances the accumulation of scalars in the valleys. In the end, we extend our work from the first study to understand flow patterns over a realistic double-hill topography. Results show that the valley gap distance is so small that the recirculation region in the valley between two hills cannot fully develop. Additionally, the WRF-IBM captures the structure of microscale flows that other models have not captured in the previous studies.
Numerical Modelling Of Airflow Within And Above Forests And Forest Clearing Using Computational Fluid Dynamics
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Author : Timothy James Phaneuf
language : en
Publisher:
Release Date : 2009
Numerical Modelling Of Airflow Within And Above Forests And Forest Clearing Using Computational Fluid Dynamics written by Timothy James Phaneuf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Clearcutting categories.
The computational fluid dynamics program, FLUENT, was first tested to validate windtunnel measurements of a scaled 10 ha forest clearing in a two dimensional domain. A variety of domain and canopy configurations were examined along with processor settings. Validation of the CFD program produced excellent results for horizontal wind velocity. Conifer shaped tree elements for the forest stands performed well and similar to the more traditional way of representing forest canopies. Turbulent kinetic energy (TKE) values output by the program seem to over predict the values calculated by using wind tunnel statistics. Various sizes of forest clearings were simulated to determine the stress that would be experienced by a forest edge immediately downwind of a clearing. Shorter gaps (15 tree heights) seem to experience high values of TKE over the downwind forest, compared to the stand upwind of the clearing; and lower stress values along the downwind forest edge. Large gaps (60 tree heights) saw higher stress values but TKE values no larger than those reported upwind of the clearing. From the stress values calculated from various input velocities and gap sizes, a new tool was produced which takes into account a sites endemic wind speed and canopy density to predict stress on forest edges downwind of clearings.
Numerical Modelling Of Airflow Within And Above Forests And Forest Clearings Using Computational Fluid Dynamics
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Author : Timothy James Phaneuf
language : en
Publisher:
Release Date : 2009
Numerical Modelling Of Airflow Within And Above Forests And Forest Clearings Using Computational Fluid Dynamics written by Timothy James Phaneuf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The computational fluid dynamics program, FLUENT, was first tested to validate windtunnel measurements of a scaled 10 ha forest clearing in a two dimensional domain. A variety of domain and canopy configurations were examined along with processor settings. Validation of the CFD program produced excellent results for horizontal wind velocity. Conifer shaped tree elements for the forest stands performed well and similar to the more traditional way of representing forest canopies. Turbulent kinetic energy (TKE) values output by the program seem to over predict the values calculated by using wind tunnel statistics. Various sizes of forest clearings were simulated to determine the stress that would be experienced by a forest edge immediately downwind of a clearing. Shorter gaps (15 tree heights) seem to experience high values of TKE over the downwind forest, compared to the stand upwind of the clearing and lower stress values along the downwind forest edge. Large gaps (60 tree heights) saw higher stress values but TKE values no larger than those reported upwind of the clearing. From the stress values calculated from various input velocities and gap sizes, a new tool was produced which takes into account a sites endemic wind speed and canopy density to predict stress on forest edges downwind of clearings.