157 citations · 1.1k across the 38 of their papers we have counts for
32 papers · 1 filter
Actuator Disk Models reproduce Actuator Line Model power and thrust fluctuation statistics in wind farm simulations
Manuel Ayala, Dennice Gayme, Charles Meneveau
Actuator-disk models (ADM) are widely used in wind-farm simulations, but their accuracy in reproducing power and thrust temporal fluctuation statistics has not yet been compared to…
Generalised actuator disk theory: wake development with turbulent entrainment
Majid Bastankhah, Peter E. Hydon, Carl Shapiro +2
Classical actuator disk theory, developed more than a century ago, provides an idealised description of turbine rotor performance. It treats a rotor as an infinitesimally-thin perm…
An extended analytical wake model and applications to yawed wind turbines in atmospheric boundary layers with different levels of stratification and veer
Ghanesh Narasimhan, Dennice F. Gayme, Charles Meneveau
Analytical wake models provide a computationally efficient means to predict velocity distributions in wind turbine wakes in the atmospheric boundary layer (ABL). Most existing mode…
Surface Wave-Aerodynamic Roughness Length Model for Air-Sea Interactions
Manuel Ayala, Dennice Gayme, Charles Meneveau
A new model to evaluate the equivalent hydrodynamic length or surface roughness, z0, of ocean waves is developed and tested. The proposed Surface Wave-Aerodynamic Roughness Length…
A Moving Surface Drag Model for LES of Wind over Waves
Manuel Ayala, Zein Sadek, Ondřej Ferčák +3
Numerical prediction of the interactions between wind and ocean waves is essential for climate modeling and a wide range of offshore operations. Large Eddy Simulation (LES) of the…
Analytical model coupling Ekman and surface layer structure in atmospheric boundary layer flows
Ghanesh Narasimhan, Dennice F. Gayme, Charles Meneveau
We introduce an analytical model that describes the vertical structure of Ekman boundary layer flows coupled to the Monin-Obukhov Similarity Theory (MOST) surface layer representat…
A structured input-output approach to characterizing optimal perturbations in wall-bounded shear flows
Chang Liu, Yu Shuai, Aishwarya Rath +1
This work builds upon recent work exploiting the notion of structured singular values to capture nonlinear interactions in the analysis of wall-bounded shear flows. In this context…
Effects of wind veer on a yawed wind turbine wake in atmospheric boundary layer flow
Ghanesh Narasimhan, Dennice F. Gayme, Charles Meneveau
Large Eddy Simulations (LES) are used to study the effects of veer (the height-dependent lateral deflection of wind velocity due to Coriolis acceleration) on the evolution of wind…
Structured input-output analysis of stably stratified plane Couette flow
Chang Liu, Colm-cille P. Caulfield, Dennice F. Gayme
We employ a recently introduced structured input-output analysis (SIOA) approach to analyze streamwise and spanwise wavelengths of flow structures in stably stratified plane Couett…
Spatial input-output analysis of large-scale structures in actuated turbulent boundary layers
Chang Liu, Igal Gluzman, Mitchell Lozier +4
This paper develops a spatial input-output approach to investigate the dynamics of a turbulent boundary layer subject to a localized single frequency excitation. This method uses o…
A vortex sheet based analytical model of the curled wake behind yawed wind turbines
Majid Bastankhah, Carl R. Shapiro, Sina Shamsoddin +2
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 wak…
Structured input-output analysis of transitional wall-bounded flows
Chang Liu, Dennice F. Gayme
Input-output analysis of transitional channel flows has proven to be a valuable analytical tool for identifying important flow structures and energetic motions. The traditional app…
The Area Localized Coupled Model for Analytical Mean Flow Prediction in Arbitrary Wind Farm Geometries
Genevieve M. Starke, Charles Meneveau, Jennifer R. King +1
This work introduces the Area Localized Coupled (ALC) model, which extends earlier approaches to coupling classical wake superposition and atmospheric boundary layer models in orde…
An input-output inspired method for permissible perturbation amplitude of transitional wall-bounded shear flows
Chang Liu, Dennice F. Gayme
The precise set of parameters governing the transition to turbulence in wall-bounded shear flows remains an open question; many theoretical bounds have been obtained, but there is…
Input-output framework for actuated boundary layers
Igal Gluzman, Dennice F. Gayme
This work extends the input-output approach to the study of wall-bounded shear flows manipulated using actuators common in experimental flow control studies. In particular, we adap…
Generation and decay of counter-rotating vortices downstream of yawed wind turbines in the atmospheric boundary layer
Carl R. Shapiro, Dennice F. Gayme, Charles Meneveau
A quantitative understanding of the dominant mechanisms that govern the generation and decay of the counter-rotating vortex pair (CVP) produced by yawed wind turbines is needed to…
An input-output based analysis of convective velocity in turbulent channels
Chang Liu, Dennice F. Gayme
This paper employs an input-output based approach to analyze convective velocities and the transport of fluctuations in turbulent channel flows. The convective velocity for a fluct…
Filtered actuator disks: Theory and application to wind turbine models in large eddy simulation
Carl R. Shapiro, Dennice F. Gayme, Charles Meneveau
The actuator disk model (ADM) continues to be a popular wind turbine representation in large eddy simulations (LES) of large wind farms. Computational restrictions typically limit…
Perturbative expansions of the conformation tensor in viscoelastic flows
Ismail Hameduddin, Dennice F. Gayme, Tamer A. Zaki
We consider the problem of formulating perturbative expansions of the conformation tensor, which is a positive-definite tensor representing polymer deformation in viscoelastic flow…
Geometric decomposition of the conformation tensor in viscoelastic turbulence
Ismail Hameduddin, Charles Meneveau, Tamer A. Zaki +1
This work introduces a mathematical approach to analysing the polymer dynamics in turbulent viscoelastic flows that uses a new geometric decomposition of the conformation tensor, a…
Scaling of energy amplification in viscoelastic channel and Couette flow
Ismail Hameduddin, Tamer A. Zaki, Dennice F. Gayme
The linear amplification of disturbances is critical in setting up transition scenarios in viscoelastic channel and Couette flow, and may also play an important role when such flow…
A Framework for Input-Output Analysis of Wall-Bounded Shear Flows
Mohamadreza Ahmadi, Giorgio Valmorbida, Dennice Gayme +1
We propose a framework to understand input-output amplification properties of non- linear partial differential equation (PDE) models of wall-bounded shear flows, which are spatiall…
Generalized coupled wake boundary layer model: applications and comparisons with field and LES data for two wind-farms
Richard J. A. M. Stevens, Dennice F. Gayme, Charles Meneveau
We describe a generalization of the Coupled Wake Boundary Layer (CWBL) model for wind-farms that can be used to evaluate the performance of wind-farms under arbitrary wind inflow d…
Effects of turbine spacing on the power output of extended wind-farms
Richard J. A. M. Stevens, Dennice F. Gayme, Charles Meneveau
We present results from large eddy simulations (LES) of extended wind-farms for several turbine configurations with a range of different spanwise and streamwise spacing combination…