Gopal Yalla
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View article: Spectral proper orthogonal decomposition of active wake mixing dynamics in a stable atmospheric boundary layer
Spectral proper orthogonal decomposition of active wake mixing dynamics in a stable atmospheric boundary layer Open
Recent advancements in the use of active wake mixing (AWM) to reduce wake effects on downstream turbines open new avenues for increasing power generation in wind farms. However, a better understanding of the fluid dynamics underlying AWM i…
View article: Comparison of wind-farm control strategies under realistic offshore wind conditions: wake quantities of interest
Comparison of wind-farm control strategies under realistic offshore wind conditions: wake quantities of interest Open
Wind-farm control strategies aim to increase the efficiency, and therefore lower the levelized cost of energy, of wind farms. This is done by using turbine settings such as the yaw angle, blade pitch angles, or generator torque to manipula…
View article: Modeling the effects of active wake mixing on wake behavior through large-scale coherent structures
Modeling the effects of active wake mixing on wake behavior through large-scale coherent structures Open
The use of active wake mixing (AWM) to mitigate downstream turbine wakes has created new opportunities for reducing power losses in wind farms. However, many current analytical or semi-empirical wake models do not capture the flow instabil…
View article: Comparison of wind farm control strategies under realistic offshore wind conditions: turbine quantities of interest
Comparison of wind farm control strategies under realistic offshore wind conditions: turbine quantities of interest Open
Wind farm flow control is a strategy to increase the efficiency and therefore lower the levelized cost of energy of a wind farm. This is done using turbine settings such as the yaw angle, blade pitch angles, or generator torque to manipula…
View article: Model intercomparison of the ABL, turbines, and wakes within the AWAKEN wind farms under neutral stability conditions
Model intercomparison of the ABL, turbines, and wakes within the AWAKEN wind farms under neutral stability conditions Open
In previous work, comparisons were made between large-scale simulations of the American Wake ExperimeNt (AWAKEN) wind farms conducted using the large-eddy simulation (LES) codes Nalu-Wind and Adaptive Mesh Refinement-Wind, the engineering …
View article: Spectral proper orthogonal decomposition of active wake mixing dynamics in a stable atmospheric boundary layer
Spectral proper orthogonal decomposition of active wake mixing dynamics in a stable atmospheric boundary layer Open
Recent advancements in the use of active wake mixing (AWM) to reduce wake effects on downstream turbines open new avenues for increasing power generation in wind farms. However, a better understanding of the fluid dynamics underlying AWM i…
View article: Comparison of wind-farm control strategies under realistic offshore wind conditions: wake quantities of interest
Comparison of wind-farm control strategies under realistic offshore wind conditions: wake quantities of interest Open
Wind-farm control strategies aim to increase the efficiency, and therefore lower the levelized cost of energy, of a wind farm. This is done by using turbine settings such as the yaw angle, blade pitch angles, or generator torque to manipul…
View article: Modeling the effects of active wake mixing on wake behavior through large scale coherent structures
Modeling the effects of active wake mixing on wake behavior through large scale coherent structures Open
The use of active wake mixing (AWM) to mitigate downstream turbine wakes has created new opportunities for reducing power losses in wind farms. However, many current analytical or semi-empirical wake models do not capture the flow instabil…
View article: Comparison of wind-farm control strategies under realistic offshore wind conditions: turbine quantities of interest
Comparison of wind-farm control strategies under realistic offshore wind conditions: turbine quantities of interest Open
Wind farm control is a strategy to increase the efficiency, and therefore lower the levelized cost of energy, a wind farm. This is done by using turbine settings such as the yaw angle, blade pitch angles, or generator torque to manipulate …
View article: Modification of wind turbine wakes by large-scale, convective atmospheric boundary layer structures
Modification of wind turbine wakes by large-scale, convective atmospheric boundary layer structures Open
In this study, we consider the impact of large-scale, convective structures in an unstable atmospheric boundary layer on wind turbine wakes. Simulation data from a high-fidelity large-eddy simulation (LES) of the AWAKEN wind farm site matc…
View article: Effects of resolution inhomogeneity in large-eddy simulation
Effects of resolution inhomogeneity in large-eddy simulation Open
Large Eddy Simulation (LES) of turbulence in complex geometries is often\nconducted using strongly inhomogeneous resolution. The issues associated with\nresolution inhomogeneity are related to the noncommutativity of the filtering\nand dif…
View article: Statistical Properties of Subgrid-Scale Turbulence Models
Statistical Properties of Subgrid-Scale Turbulence Models Open
This review examines large eddy simulation (LES) models from the perspective of their a priori statistical characteristics. The most well-known statistical characteristic of an LES subgrid-scale model is its dissipation (energy transfer to…
View article: On the Effects of Resolution Inhomogeneity in LES
On the Effects of Resolution Inhomogeneity in LES Open
Large Eddy Simulation (LES) of turbulence in complex geometries is often conducted using discretizations with highly inhomogeneous resolution. The issues associated with resolution inhomogeneity are related to the noncommutativity of the f…