Application of Different Turbulence Models Simulating Wind Flow in Complex Terrain: A Case Study for the WindForS Test Site

Knaus, Hermann; Hofsäß, Martin; Rautenberg, Alexander; Bange, Jens

doi:10.3390/computation6030043

Cited by 5 publications

(4 citation statements)

References 30 publications

(51 reference statements)

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“…The long blades of modern wind turbines reach down into this area with stronger turbulence in the lee of the trees. Knaus et al (2018) showed that not only orographic effects, but also lee effects of trees affect the flow over an escarpment at these heights. The model results show a significant increase of the turbulence kinetic energy (TKE, k) and a minimum in wind speed below 50 m above ground in the lee of the trees (Knaus et al 2018).…”

Section: Introductionmentioning

confidence: 98%

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A Two-Day Case Study: Comparison of Turbulence Data from an Unmanned Aircraft System with a Model Chain for Complex Terrain

Berge

Schoen

Mauz

et al. 2021

Boundary-Layer Meteorol

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The airborne measurement platform MASC-3 (Multi-Purpose Airborne Sensor Carrier) is used for measurements over a forested escarpment in the Swabian Alps to evaluate the wind field. Data from flight legs between 20 and 200 m above the ground on two consecutive days with uphill (westerly) flow in September 2018 are analyzed. In the lowest 140 m above the ground a speed-up is found with increased turbulence and changes in wind direction directly over the escarpment, whereas in the lowest 20 to 50 m above the ground a deceleration of the flow is measured. Additionally, simulation results from a numerical model chain based on the Weather Research and Forecasting (WRF) model and an OpenFOAM (Open Source Field Operation and Manipulation) model, developed for complex terrain, are compared to the data captured by MASC-3. The models and measurements compare well for the mean wind speed and inclination angle.

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Section: Introductionmentioning

confidence: 98%

“…Measurements and simulations showed an accelerated flow over the escarpment with westerly winds. Due to surface roughness and the orography, the strongest turbulence fluctuations and flow acceleration were observed at the lowest 10 to 80 m above ground upstream of the escarpment (Knaus et al 2018;Letzgus et al 2018).…”

Section: Introductionmentioning

confidence: 99%

A Two-Day Case Study: Comparison of Turbulence Data from an Unmanned Aircraft System with a Model Chain for Complex Terrain

Berge

Schoen

Mauz

et al. 2021

Boundary-Layer Meteorol

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“…One of the most common coupling methods is the one-way approach where the mesoscale model is coupled to the microscale model through the lateral boundaries at fixed times (time-slice). This approach has been successfully applied in complex terrain by several authors as [18][19][20] among others.…”

Section: Introductionmentioning

confidence: 99%

Comparison of CFD Simulation to UAS Measurements for Wind Flows in Complex Terrain: Application to the WINSENT Test Site

et al. 2019

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This investigation presents a modelling strategy for wind-energy studies in complex terrains using computational fluid dynamics (CFD). A model, based on an unsteady Reynolds Averaged Navier-Stokes (URANS) approach with a modified version of the standard k-ε model, is applied. A validation study based on the Leipzig experiment shows the ability of the model to simulate atmospheric boundary layer characteristics such as the Coriolis force and shallow boundary layer. By combining the results of the model and a design of experiments (DoE) method, we could determine the degree to which the slope, the leaf area index, and the forest height of an escarpment have an effect on the horizontal velocity, the flow inclination angle, and the turbulent kinetic energy at critical positions. The DoE study shows that the primary contributor at a turbine-relevant height is the slope of the escarpment. In the second step, the method is extended to the WINSENT test site. The model is compared with measurements from an unmanned aircraft system (UAS). We show the potential of the methodology and the satisfactory results of our model in depicting some interesting flow features. The results indicate that the wakes with high turbulence levels downstream of the escarpment are likely to impact the rotor blade of future wind turbines.

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“…ANSYS CFD has a few number of methods or turbulent models for the simulation of geometric models such as SST model, k-ε model, LES model and k-ω model. And for the present study which is an atmospheric boundary-layer study, a realizable k-ε model has been used because of its suitability [40][41][42]. The past studies show the efficiency of the method.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of the wind field around pyramidal roofed single-story buildings

Singh

Roy

2019

SN Appl. Sci.

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For the structural safety to counter the wind load, the roof shape and the roof slope both the constraints play an important role. The present study demonstrates the pressure distribution on the pyramidal roofs of a pentagonal and hexagonal plan low-rise single-story building due to the wind load through CFD simulation. This type of roofed building may be considered as one of the cyclone shelters as it is shown by post-disaster studies that pyramidal roof is found better than other roof shapes to resist the wind load. The modeling of the building and the meshing of the models have been carried out in ANSYS ICEM CFD, while the simulation process has been performed in ANSYS Fluent. To obtain the results, ANSYS CFD-Post has been utilized. For the simulation of the turbulent wind flow, a realizable k-ε turbulent model is used in the present study. In the current study, ten different building models (five with pentagonal plan and five with hexagonal plan) are generated having roof angles 20°, 25°, 30°, 35° and 40°, and all are simulated for 0°-45° wind direction @15° interval. The pressure coefficient contours for different wind directions for varying roof slopes are mapped in the present study. Results show that the hexagonal pyramidal roof surface building has low-pressure coefficients and better chances of survival than the pentagonal pyramidal roof surface building.

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Application of Different Turbulence Models Simulating Wind Flow in Complex Terrain: A Case Study for the WindForS Test Site

Cited by 5 publications

References 30 publications

A Two-Day Case Study: Comparison of Turbulence Data from an Unmanned Aircraft System with a Model Chain for Complex Terrain

A Two-Day Case Study: Comparison of Turbulence Data from an Unmanned Aircraft System with a Model Chain for Complex Terrain

Comparison of CFD Simulation to UAS Measurements for Wind Flows in Complex Terrain: Application to the WINSENT Test Site

CFD simulation of the wind field around pyramidal roofed single-story buildings

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