Blar i Bergen Open Research Archive på forfatter "Bakhoday Paskyabi, Mostafa"
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Comparison of direct covariance flux measurements from an offshore tower and a buoy
Flügge, Martin; Bakhoday Paskyabi, Mostafa; Reuder, Joachim; Edson, James B.; Plueddemann, Albert J. (Peer reviewed; Journal article, 2016-05)Direct covariance flux (DCF) measurements taken from floating platforms are contaminated by wave-induced platform motions that need to be removed before computation of the turbulent fluxes. Several correction algorithms ... -
A comparison of Langmuir turbulence parameterizations and key wave effects in a numerical model of the North Atlantic and Arctic Oceans
Ali, Alfatih; Christensen, Kai Håkon; Breivik, Øyvind; Bertino, Laurent; Malila, Mika Petteri; Raj, Roshin Pappukutty; Chassignet, Eric P.; Bakhoday Paskyabi, Mostafa (Peer reviewed; Journal article, 2019)Five different parameterizations of Langmuir turbulence (LT) effect are investigated in a realistic model of the North Atlantic and Arctic using realistic wave forcing from a global wave hindcast. The parameterizations ... -
The Departure from Mixed-Layer Similarity During the Afternoon Decay of Turbulence in the Free-Convective Boundary Layer: Results from Large-Eddy Simulations
Elguernaoui, Omar; Reuder, Joachim; Li, Dan; Maronga, Bjørn; Bakhoday Paskyabi, Mostafa; Wolf, Tobias; Esau, Igor (Journal article; Peer reviewed, 2023)This study analyses the departure of the velocity-variances profiles from their quasi-steady state described by the mixed-layer similarity, using large-eddy simulations with different prescribed shapes and time scales of ... -
Effects of negative shear on loads for a 15 MW offshore wind turbine during low-level jet events
Ahmed, Fahim Masud; Bakhoday Paskyabi, Mostafa (Journal article; Peer reviewed, 2023)Wind turbines are more often interacting with the negative shear region of a low-level jet due to increasing turbine sizes. However, the effects of negative shear on wind turbines are not sufficiently studied, particularly ... -
Evaluation of Gaussian wake models under different atmospheric stability conditions: Comparison with large eddy simulation results
Krutova, Maria; Bakhoday Paskyabi, Mostafa; Reuder, Joachim; Nielsen, Finn Gunnar (Journal article; Peer reviewed, 2020)The calculation of the velocity deficit in the wake of individual wind turbines is a fundamental part of the wind farm analysis. A good approximation of the wake deficit behind a single wind turbine will improve the power ... -
Evaluation of sea surface roughness parameterization in meso-to-micro scale simulation of the offshore wind field
Ning, Xu; Bakhoday Paskyabi, Mostafa; Bui, Hai; Mohammadpour Penchah, Mohammadreza (Journal article; Peer reviewed, 2023)Accurate parameterization of the wind-induced effects on the Marine Atmospheric Boundary Layer (MABL) is of fundamental importance for many applications including weather forecasting and offshore wind energy. Roughness ... -
Implementation of a Simple Actuator Disk for Large-Eddy Simulation in the Weather Research and Forecasting Model (WRF-SADLES v1.2) for wind turbine wake simulation
Bui, Hoang Hai; Bakhoday Paskyabi, Mostafa; Mohammadpour Penchah, Mohammadreza (Journal article; Peer reviewed, 2024)In this study, we present the development of a Simple Actuator Disk model for Large-Eddy Simulation (SADLES), implemented within the Weather Research and Forecasting (WRF) model, which is widely used in atmospheric research. ... -
Lagrangian Measurement of Waves and Near Surface Turbulence from Acoustic Instruments
Bakhoday Paskyabi, Mostafa; Bryhni, Helge Thomas; Reuder, Joachim; Fer, Ilker (Peer reviewed; Journal article, 2015-12-02)We demonstrate high-resolution measurements of upper ocean flow and turbulence using a Lagrangian drifter. A spherical buoy as a quasi-wave following drifter mitigate the contaminations induced by wave orbital velocities ... -
Multiscale Simulation of Offshore Wind Variability During Frontal Passage: Brief Implication on Turbines’ Wakes and Load
Bakhoday Paskyabi, Mostafa; Krutova, Maria; Bui, Hai; Ning, Xu (Journal article; Peer reviewed, 2022)Enhancing the performance of offshore wind park power production requires, to a large extent, a better understanding of the interactions of wind farms and individual wind turbines with the atmospheric boundary layer over ... -
Offshore Wind Farm Wake Effect on Stratification and Coastal Upwelling
Bakhoday Paskyabi, Mostafa (Peer reviewed; Journal article, 2015-12-02)In this study, the interactions between an offshore wind farm, upper-ocean currents, and stratification are examined under shallow water conditions from a two-dimensional modeling standpoint. The modeling results from two ... -
On Stochastic Reduced-Order and LES-based Models of Offshore Wind Turbine Wakes
Bakhoday Paskyabi, Mostafa; Krutova, Maria; Nielsen, Finn Gunnar; Reuder, Joachim; Guernaoui, O. EL. (Journal article; Peer reviewed, 2020)In this paper, the primary objective is to investigate flow structures in the wake of wind turbines based on applying a truncated Proper Orthogonal Decomposition (POD) approach. This scheme decomposes the three-dimensional ... -
Parameterization of Wave-Induced Stress in Large-Eddy Simulations of the Marine Atmospheric Boundary Layer
Ning, Xu; Bakhoday Paskyabi, Mostafa (Journal article; Peer reviewed, 2024)Large-eddy simulations (LES) of the Marine Atmospheric Boundary Layer (MABL) commonly utilize roughness length to parameterize wave effects on the sea surface. However, this method might not adequately capture the intricacies ... -
Predictive Analysis of Machine Learning Schemes in Forecasting of Offshore Wind
Bakhoday Paskyabi, Mostafa (Journal article; Peer reviewed, 2020)High variability of wind in the farm areas causes a drastic instability in the energy markets. Therefore, precise forecast of wind speed plays a key role in the optimal prediction of offshore wind power. In this study, we ... -
Proof of concept for turbulence measurements with the RPAS SUMO during the BLLAST campaign
Båserud, Line; Reuder, Joachim; Jonassen, Marius Opsanger; Kral, Stephan; Bakhoday Paskyabi, Mostafa; Lothon, Marie (Peer reviewed; Journal article, 2016-10-06)The micro-RPAS (remotely piloted aircraft system) SUMO (Small Unmanned Meteorological Observer) equipped with a five-hole-probe (5HP) system for turbulent flow measurements was operated in 49 flight missions during the ... -
Sea surface gravity wave - wind interaction in the marine atmospheric boundary layer
Bakhoday Paskyabi, Mostafa; Zieger, S; Jenkins, Alastair David; Babanin, A. V.; Chalikov, D (Peer reviewed; Journal article, 2014)In this study, we investigate the turbulence structure over idealized wind-generated surface gravity waves with varying wave age using a wave-modified one-dimensional boundary layer model. To prescribe the shape of the ... -
Self-nested large-eddy simulations in PALM model system v21.10 for offshore wind prediction under different atmospheric stability conditions
Krutova, Maria; Bakhoday Paskyabi, Mostafa; Reuder, Joachim; Nielsen, Finn Gunnar (Journal article; Peer reviewed, 2023)Large-eddy simulation (LES) resolves large-scale turbulence directly and parametrizes small-scale turbulence. Resolving micro-scale turbulence, e.g., in wind turbine wakes, requires both a sufficiently small grid spacing ... -
Statistic and coherence response of ship-based lidar observations to motion compensation
Duscha, Christiane; Bakhoday Paskyabi, Mostafa; Reuder, Joachim (Journal article; Peer reviewed, 2020)Ship-based profiling Lidar systems experience a strong influence of rotational and translational motion on beam direction and hence the line-of-sight velocity. This motion error is inherited by the retrieved 3-dimensional ... -
Turbulence-particle interactions under surface gravity waves
Bakhoday Paskyabi, Mostafa (Peer reviewed; Journal article, 2016)The dispersion and transport of single inertial particles through an oscillatory turbulent aquatic environment are examined numerically by a Lagrangian particle tracking model using a series of idealised test cases. The ... -
A wavelet-entropy based segmentation of turbulence measurements from a moored shear probe near the wavy sea surface
Bakhoday Paskyabi, Mostafa (Peer reviewed; Journal article, 2019-12-17)In this study, we explore the applicability of a wavelet-entropy based segmentation technique in reduction of motion-induced contaminations in time-domain from subsurface turbulence measurements made by a moving shear ... -
Wind Stress in the Coastal Zone: Observations from a Buoy in Southwestern Norway
Flügge, Martin; Bakhoday Paskyabi, Mostafa; Reuder, Joachim; El Guernaoui, Omar (Peer reviewed; Journal article, 2019-08-26)Several studies have focused on the investigation of the wind stress in open ocean conditions where coastal processes were negligible. However, the direction and magnitude of the wind stress vector in coastal areas are ...