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Dr Majid Bastankhah's Outputs (19)

Modelling turbulence in axisymmetric wakes: an application to wind turbine wakes (2024)
Journal Article
Bastankhah, M., Zunder, J. K., Hydon, P. E., Deebank, C., & Placidi, M. (2024). Modelling turbulence in axisymmetric wakes: an application to wind turbine wakes. Journal of Fluid Mechanics, 1000, Article A2. https://doi.org/10.1017/jfm.2024.664

A novel fast-running model is developed to predict the three-dimensional (3-D) distribution of turbulent kinetic energy (TKE) in axisymmetric wake flows. This is achieved by mathematically solving the partial differential equation of the TKE transpor... Read More about Modelling turbulence in axisymmetric wakes: an application to wind turbine wakes.

FLOWERS AEP: An Analytical Model for Wind Farm Layout Optimization (2024)
Journal Article
LoCascio, M. J., Bay, C. J., Martínez‐Tossas, L. A., Bastankhah, M., & Gorlé, C. (online). FLOWERS AEP: An Analytical Model for Wind Farm Layout Optimization. Wind Energy, Article e2954. https://doi.org/10.1002/we.2954

Annual energy production (AEP) is commonly used in objective functions for wind farm layout optimization. AEP is proportional to wind farm power production integrated over an annual distribution of free‐stream wind conditions. Physics‐based estimates... Read More about FLOWERS AEP: An Analytical Model for Wind Farm Layout Optimization.

Characterisation and Integration of Piezoelectric Trimorph Actuators for Blade Active Surface Control on a Scaled Wind Turbine (2024)
Journal Article
Fuentes Holden, J. P., Gan, L., Sims-Williams, D., Gilbert, J., Osborne, P., & Bastankhah, M. (2024). Characterisation and Integration of Piezoelectric Trimorph Actuators for Blade Active Surface Control on a Scaled Wind Turbine. Journal of Physics: Conference Series, 2767(9), Article 092094. https://doi.org/10.1088/1742-6596/2767/9/092094

The paper investigates the integration of piezoelectric bending actuators on trailing edge flaps (TEF). The characterisation of piezoelectric actuators is of great importance due to differences in performance resulting from sample variability, actuat... Read More about Characterisation and Integration of Piezoelectric Trimorph Actuators for Blade Active Surface Control on a Scaled Wind Turbine.

A fast-running physics-based wake model for a semi-infinite wind farm (2024)
Journal Article
Bastankhah, M., Mohammadi, M. M., Lees, C., Diaz, G. P. N., Buxton, O. R., & Ivanell, S. (2024). A fast-running physics-based wake model for a semi-infinite wind farm. Journal of Fluid Mechanics, 985, Article A43. https://doi.org/10.1017/jfm.2024.282

This paper presents a new generation of fast-running physics-based models to predict the wake of a semi-infinite wind farm, extending infinitely in the lateral direction but with finite size in the streamwise direction. The assumption of a semi-infin... Read More about A fast-running physics-based wake model for a semi-infinite wind farm.

Curled-Skewed Wakes behind Yawed Wind Turbines Subject to Veered Inflow (2022)
Journal Article
Mohammadi, M., Bastankhah, M., Fleming, P., Churchfield, M., Bossanyi, E., Landberg, L., & Ruisi, R. (2022). Curled-Skewed Wakes behind Yawed Wind Turbines Subject to Veered Inflow. Energies, 15(23), Article 9135. https://doi.org/10.3390/en15239135

This work presents a new engineering analytical model that predicts the effect of both the turbine yaw misalignment and the inflow wind veer on the wake flow distribution downwind of a wind turbine. To consider the veered inflow, two methods were exa... Read More about Curled-Skewed Wakes behind Yawed Wind Turbines Subject to Veered Inflow.

FLOW Estimation and Rose Superposition (FLOWERS): an integral approach to engineering wake models (2022)
Journal Article
LoCascio, M. J., Bay, C. J., Bastankhah, M., Barter, G. E., Fleming, P. A., & Martínez-Tossas, L. A. (2022). FLOW Estimation and Rose Superposition (FLOWERS): an integral approach to engineering wake models. Wind Energy Science, 7(3), 1137-1151. https://doi.org/10.5194/wes-7-1137-2022

Annual energy production (AEP) is often the objective function in wind plant layout optimization studies. The conventional method to compute AEP for a wind farm is to first evaluate power production for each discrete wind direction and speed using ei... Read More about FLOW Estimation and Rose Superposition (FLOWERS): an integral approach to engineering wake models.

A vortex sheet based analytical model of the curled wake behind yawed wind turbines (2021)
Journal Article
Bastankhah, M., Shapiro, C. R., Shamsoddin, S., Gayme, D. F., & Meneveau, C. (2022). A vortex sheet based analytical model of the curled wake behind yawed wind turbines. Journal of Fluid Mechanics, 933, Article A2. https://doi.org/10.1017/jfm.2021.1010

Motivated by the need for compact descriptions of the evolution of non-classical wakes behind yawed wind turbines, we develop an analytical model to predict the shape of curled wakes. Interest in such modelling arises due to the potential of wake ste... Read More about A vortex sheet based analytical model of the curled wake behind yawed wind turbines.

Wake steering of multirotor wind turbines (2021)
Journal Article
Speakman, G. A., Abkar, M., Martínez‐Tossas, L. A., & Bastankhah, M. (2021). Wake steering of multirotor wind turbines. Wind Energy, 24(11), 1294-1314. https://doi.org/10.1002/we.2633

In this paper, wake steering is applied to multirotor turbines to determine whether it has the potential to reduce wind plant wake losses. Through application of rotor yaw to multirotor turbines, a new degree of freedom is introduced to wind farm con... Read More about Wake steering of multirotor wind turbines.

Analytical solution for the cumulative wake of wind turbines in wind farms (2021)
Journal Article
Bastankhah, M., Welch, B. L., Martínez-Tossas, L. A., King, J., & Fleming, P. (2021). Analytical solution for the cumulative wake of wind turbines in wind farms. Journal of Fluid Mechanics, 911, Article A53. https://doi.org/10.1017/jfm.2020.1037

This paper solves an approximate form of conservation of mass and momentum for a turbine in a wind farm array. The solution is a fairly simple explicit relationship that predicts the streamwise velocity distribution within a wind farm with an arbitra... Read More about Analytical solution for the cumulative wake of wind turbines in wind farms.

Wind-Turbine and Wind-Farm Flows: A Review (2019)
Journal Article
Porte-Agel, F., Bastankhah, M., & Shamsoddin, S. (2020). Wind-Turbine and Wind-Farm Flows: A Review. Boundary-Layer Meteorology, 174, 1-59. https://doi.org/10.1007/s10546-019-00473-0

Wind energy, together with other renewable energy sources, are expected to grow substantially in the coming decades and play a key role in mitigating climate change and achieving energy sustainability. One of the main challenges in optimizing the des... Read More about Wind-Turbine and Wind-Farm Flows: A Review.

Round-robin tests of porous disc models (2019)
Journal Article
Aubrun, S., Bastankhah, M., Cal, R., Conan, B., Hearst, R., Hoek, D., Hölling, M., Huang, M., Hur, C., Karlsen, B., Neunaber, I., Obligado, M., Peinke, J., Percin, M., Saetran, L., Schito, P., Schliffke, B., Sims-Williams, D., Uzol, O., Vinnes, M., & Zasso, A. (2019). Round-robin tests of porous disc models. Journal of Physics: Conference Series, 1256, https://doi.org/10.1088/1742-6596/1256/1/012004

Wind farm power optimization via yaw angle control: A wind tunnel study (2019)
Journal Article
Bastankhah, M., & Porté-Agel, F. (2019). Wind farm power optimization via yaw angle control: A wind tunnel study. Journal of Renewable and Sustainable Energy, 11(2), Article 023301. https://doi.org/10.1063/1.5077038

Yaw angle control is known nowadays as a promising and effective technique to mitigate wake effects in wind farms. In this paper, we perform wind tunnel experiments to study the performance of a model wind farm with five turbine rows under a wide var... Read More about Wind farm power optimization via yaw angle control: A wind tunnel study.

A New Miniature Wind Turbine for Wind Tunnel Experiments. Part II: Wake Structure and Flow Dynamics (2017)
Journal Article
Bastankhah, M., & Porté-Agel, F. (2017). A New Miniature Wind Turbine for Wind Tunnel Experiments. Part II: Wake Structure and Flow Dynamics. Energies, 10(7), Article 923. https://doi.org/10.3390/en10070923

An optimized three-bladed horizontal-axis miniature wind turbine, called WiRE-01, with the rotor diameter of 15 cm is designed and fully characterized in Part I of this study. In the current part of the study, we investigate the interaction of the tu... Read More about A New Miniature Wind Turbine for Wind Tunnel Experiments. Part II: Wake Structure and Flow Dynamics.

A new analytical model for wind-turbine wakes (2014)
Journal Article
Bastankhah, M., & Porté-Agel, F. (2014). A new analytical model for wind-turbine wakes. Renewable Energy, 70, 116-123. https://doi.org/10.1016/j.renene.2014.01.002

A new analytical wake model is proposed and validated to predict the wind velocity distribution downwind of a wind turbine. The model is derived by applying conservation of mass and momentum and assuming a Gaussian distribution for the velocity de fi... Read More about A new analytical model for wind-turbine wakes.