A Simple Three-Dimensional Terrain Modeling Method for Complex Terrain Wind Environment Simulation

2013 ◽  
Vol 397-400 ◽  
pp. 2420-2425
Author(s):  
Shi Ling Chen ◽  
Jun Lu ◽  
Wei Wei Yu ◽  
Shao Liang Zhang
Keyword(s):  
Complex Terrain ◽  
Cfd Simulation ◽  
Surface Wind ◽  
Three Dimensional ◽  
Modeling Method ◽  
Terrain Modeling ◽  
Wind Environment ◽  
Near Surface ◽  
Digital Modeling ◽  
Environment Simulation

In order to solve the problems in complex terrain modeling by computational fluid dynamics(CFD) simulation at prophase, such as difficulty in collecting data, tedious modeling process, wasting times and so on. In this paper, combined various commonly digital technology，and the transformation between the network terrain file and CFD (PHOENICS) solid model is realized by using a new set of outdoor complex terrain rapid digital modeling method. Take mountain city -Chongqing as an object to analyses the near-surface wind environment. The method is directly generated by the network terrain data without any screening or simplified. The virtual model can be matched the actual terrain with the extreme. By using the simulation cycle for complex terrain, time will be greatly shortened for urban planning.

A mixed finite element/control volume model of wind-driven circulation in lakes

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Victor Podsechin
Keyword(s):  
Control Volume ◽  
Mixed Finite Element ◽  
Surface Wind ◽  
Three Dimensional ◽  
Circulation Model ◽  
Hydrodynamic Equations ◽  
Governing Equations ◽  
Near Surface ◽  
Stream Functions ◽  
Surface Wind Field

AbstractA three-dimensional numerical circulation model is described. The model is based on non-linear hydrodynamic equations, modified according to hydrostatic and Boussinesq approximations. A space-splitting scheme is used for numerical approximations of governing equations. The simple hypothesis on elliptic stream functions shape is utilized to reconstruct the near-surface wind field. The calculated currents correspond reasonably well with observed velocities in different locations lake-wide.

scholarly journals Downscaling surface wind predictions from numerical weather prediction models in complex terrain with WindNinja

2016 ◽  
Author(s):  
N. S. Wagenbrenner ◽  
J. M. Forthofer ◽  
B. K. Lamb ◽  
K. S. Shannon ◽  
B. W. Butler
Keyword(s):  
Numerical Weather Prediction ◽  
Complex Terrain ◽  
Prediction Models ◽  
Wildland Fire ◽  
Weather Prediction ◽  
Surface Wind ◽  
Atmospheric Stability ◽  
Wind Model ◽  
Near Surface ◽  
Numerical Weather

Abstract. Wind predictions in complex terrain are important for a number of applications. Dynamic downscaling of numerical weather prediction (NWP) model winds with a high resolution wind model is one way to obtain a wind forecast that accounts for local terrain effects, such as wind speed-up over ridges, flow channeling in valleys, flow separation around terrain obstacles, and flows induced by local surface heating and cooling. In this paper we investigate the ability of a mass-consistent wind model for downscaling near-surface wind predictions from four NWP models in complex terrain. Model predictions are compared with surface observations from a tall, isolated mountain. Downscaling improved near-surface wind forecasts under high-wind (near-neutral atmospheric stability) conditions. Results were mixed during upslope and downslope (non-neutral atmospheric stability) flow periods, although wind direction predictions generally improved with downscaling. This work constitutes evaluation of a diagnostic wind model at unprecedented high spatial resolution in terrain with topographical ruggedness approaching that of typical landscapes in the western US susceptible to wildland fire.

scholarly journals Evaluation of Wind Flow Characteristics by RANS-Based Numerical Site Calibration (NSC) Method with Met-Tower Measurements and Its Application to a Complex Terrain

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5121 ◽  
Author(s):  
Jae-ho Jeong ◽  
Kwangtae Ha
Keyword(s):  
High Resolution ◽  
Wind Turbine ◽  
Complex Terrain ◽  
Cfd Simulation ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Vortical Flow ◽  
Wind Flow ◽  
Rans Simulation ◽  
Resolution Scheme

The performance of wind turbines is not only dependent on the wind turbine design itself, but is also dependent on the accurate assessment of wind resources at the installation site. In this paper, the numerical site calibration (NSC) method using three-dimensional Reynolds-averaged Navier–Stokes (RANS) simulation was proposed to accurately forecast the wind flow characteristics of wind turbine sites with complex terrains, namely Methil in Scotland, and Haenam in South Korea. From NSC at the Methil and Haenam sites, it was shown that the complicated and vortical flow fields around hills and valleys were captured using the three-dimensional RANS CFD simulation in Ansys CFX software based on a high-resolution scheme with a renormalization group (RNG)-based k-ε turbulence model. It was also shown that topographically induced wind profile and turbulence intensity over a local-scale complex terrain are remarkably dominated by flow separation after passing hills. It was concluded that the proposed NSC method using three-dimensional RANS simulation with a high-resolution scheme was an economically useful method for evaluating wind flow characteristics numerically to assess wind turbine sites with complex terrains and designing the wind farm layout.

Downscaling near-surface wind over complex terrain using a physically-based statistical modeling approach

2014 ◽  
Vol 44 (1-2) ◽  
pp. 529-542 ◽  
Author(s):  
Hsin-Yuan Huang ◽  
Scott B. Capps ◽  
Shao-Ching Huang ◽  
Alex Hall
Keyword(s):  
Statistical Modeling ◽  
Complex Terrain ◽  
Surface Wind ◽  
Near Surface ◽  
Modeling Approach ◽  
Physically Based

scholarly journals Finescale Single- and Dual-Doppler Analysis of Tornado Intensification, Maintenance, and Dissipation in the Orleans, Nebraska, Supercell

2010 ◽  
Vol 138 (12) ◽  
pp. 4439-4455 ◽  
Author(s):  
Joshua Wurman ◽  
Karen Kosiba ◽  
Paul Markowski ◽  
Yvette Richardson ◽  
David Dowell ◽  
...  
Keyword(s):  
Life Cycle ◽  
Surface Wind ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Near Surface ◽  
Wind Speeds ◽  
Gust Fronts ◽  
The Town ◽  
Doppler Analysis ◽  
Observation Period

Abstract Finescale single- and dual-Doppler observations are used to diagnose the three-dimensional structure of the wind field surrounding a tornado that occurred near the town of Orleans, Nebraska, on 22 May 2004. The evolution of the vorticity and divergence fields and other structures near the tornado are documented in the lowest kilometer. Changes in tornado intensity are compared to the position of the tornado relative to primary and secondary gust fronts. Circulation on scales of a few kilometers surrounding the tornado remains relatively constant during the analysis period, which spans the intensifying and mature periods of the tornado’s life cycle. Stretching of vertical vorticity and tilting of horizontal vorticity are diagnosed, but the latter is near or below the threshold of detectability in this analysis during the observation period in the analyzed domain. Low-level circulation within 500 m of the tornado increased several minutes before vortex-relative and ground-relative near-surface wind speeds in the tornado increased, raising the possibility that such trends in circulation may be useful in forecasting tornado intensification.

Statistical downscaling of near-surface wind over complex terrain in southern France

2008 ◽  
Vol 103 (1-4) ◽  
pp. 253-265 ◽  
Author(s):  
T. Salameh ◽  
P. Drobinski ◽  
M. Vrac ◽  
P. Naveau
Keyword(s):  
Statistical Downscaling ◽  
Complex Terrain ◽  
Surface Wind ◽  
Near Surface ◽  
Southern France

scholarly journals Improving the Near-Surface Wind Forecast around the Turpan Basin of the Northwest China by Using the WRF_TopoWind Model

Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1624
Author(s):  
Hui Ma ◽  
Xiaolei Ma ◽  
Shengwei Mei ◽  
Fei Wang ◽  
Yanwei Jing
Keyword(s):  
Wind Energy ◽  
Complex Terrain ◽  
Wind Farm ◽  
Surface Wind ◽  
Wrf Model ◽  
Forecast Accuracy ◽  
Clean Energy ◽  
Northwest China ◽  
Surface Drag ◽  
Near Surface

Wind energy is a type of renewable and clean energy which has attracted more and more attention all over the world. The Northwest China is a region with the most abundant wind energy not only in China, but also in the whole world. To achieve the goal of carbon neutralization, there is an urgent need to make full use of wind energy in Northwest China and to improve the efficiency of wind power generation systems in this region. As forecast accuracy of the near-surface wind is crucial to wind-generated electricity efficiency, improving the near-surface wind forecast is of great importance. This study conducted the first test to incorporate the subgrid surface drag into the near-surface wind forecast under the complex terrain conditions over Northwest China by using two TopoWind models added by newer versions of the Weather Research and Forecasting (WRF) model. Based on three groups (each group had 28 runs) of forecasts (i.e., Control run, Test 01 and Test 02) started at 12:00 UTC of each day (ran for 48 h) during the period of 1–28 October 2020, it was shown that, overall, both TopoWind models could improve the near-surface wind speed forecasts under the complex terrain conditions over Northwest China, particularly for reducing the errors associated with the forecast of the wind-speed’s magnitude. In addition to wind forecast, the forecasts of sea level pressure and 2-m temperature were also improved. Different geographical features (wind-farm stations located south of the mountain tended to have more accurate forecast) and weather systems were found to be crucial to forecast accuracy. Good forecasts tended to appear when the simulation domain was mainly controlled by the high-pressure systems with the upper-level jet far from it.

Spatial and temporal variation of the near-surface wind environment in the dune fields of northern China

2017 ◽  
Vol 38 (5) ◽  
pp. 2333-2351 ◽  
Author(s):  
Xujia Cui ◽  
Zhibao Dong ◽  
Hu Sun ◽  
Chao Li ◽  
Fengjun Xiao ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Surface Wind ◽  
Northern China ◽  
Spatial And Temporal Variation ◽  
Wind Environment ◽  
Near Surface

scholarly journals Horizontal Vortex Tubes near a Simulated Tornado: Three-Dimensional Structure and Kinematics

Atmosphere ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 716 ◽  
Author(s):  
Oliveira ◽  
Xue ◽  
Roberts ◽  
Wicker ◽  
Yussouf
Keyword(s):  
Wide Spectrum ◽  
Surface Wind ◽  
3D Structure ◽  
Three Dimensional ◽  
Surface Friction ◽  
Radar Data ◽  
Dimensional Structure ◽  
Small Scale ◽  
Near Surface ◽  
Vortex Tubes

Supercell thunderstorms can produce a wide spectrum of vortical structures, ranging from midlevel mesocyclones to small-scale suction vortices within tornadoes. A less documented class of vortices are horizontally-oriented vortex tubes near and/or wrapping about tornadoes, that are observed either visually or in high-resolution Doppler radar data. In this study, an idealized numerical simulation of a tornadic supercell at 100 m grid spacing is used to analyze the three-dimensional (3D) structure and kinematics of horizontal vortices (HVs) that interact with a simulated tornado. Visualizations based on direct volume rendering aided by visual observations of HVs in a real tornado reveal the existence of a complex distribution of 3D vortex tubes surrounding the tornadic flow throughout the simulation. A distinct class of HVs originates in two key regions at the surface: around the base of the tornado and in the rear-flank downdraft (RFD) outflow and are believed to have been generated via surface friction in regions of strong horizontal near-surface wind. HVs around the tornado are produced in the tornado outer circulation and rise abruptly in its periphery, assuming a variety of complex shapes, while HVs to the south-southeast of the tornado, within the RFD outflow, ascend gradually in the updraft.

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