A5012843483- Fluid Dynamics and Turbulent Flows
- Wind Energy Research and Development
- Aerodynamics and Acoustics in Jet Flows
- Computational Fluid Dynamics and Aerodynamics
- Aeolian processes and effects
- Wind and Air Flow Studies
- Particle Dynamics in Fluid Flows
- Plasma and Flow Control in Aerodynamics
- Meteorological Phenomena and Simulations
- Lattice Boltzmann Simulation Studies
- Fluid Dynamics and Heat Transfer
- Coastal and Marine Dynamics
- Ocean Waves and Remote Sensing
- Plant Water Relations and Carbon Dynamics
- Offshore Engineering and Technologies
- Turbomachinery Performance and Optimization
- Cavitation Phenomena in Pumps
- Computer Graphics and Visualization Techniques
- Marine and Offshore Engineering Studies
- Fluid Dynamics and Thin Films
- Fluid Dynamics and Vibration Analysis
- Combustion and flame dynamics
National University of Singapore
2018-2023
National Sun Yat-sen University
2023
Kindai University
2022
KU Leuven
2014-2018
A direct numerical simulation study is conducted to investigate sinusoidal oscillatory flow over a two-dimensional wavy wall. The height and wavelength of the bottom profile, period amplitude free-stream oscillation, are selected mimic wave-driven boundary layer vortex ripples on sandy seabed. Two cases with different Reynolds numbers $(Re)$ considered, higher- $Re$ case achieves fully developed turbulent state wide separation between energy-containing dissipative scales. characterized by...
Estimation of interface curvature in surface-tension dominated flows is a remaining challenge Volume Fluid (VOF) methods. Data-driven methods are recently emerging as promising alternative this domain. They outperform conventional on coarser grids but diverge with grid refinement. Furthermore, unlike methods, data-driven sensitive to coordinate system and sign conventions, thus often fail capture basic symmetry patterns interfaces. The present work proposes new strategy which conserves the...
Recent experiments have revealed the existence of very long streamwise features, denoted as very-large-scale motions (VLSMs), in thermally neutral atmospheric boundary layer (ABL) (Hutchins et al. , Boundary-Layer Meteorol. vol. 145(2), 2012, pp. 273–306). The aim our study is to elaborate role these large-scale anisotropic patterns wind-energy harvesting with special emphasis on organization turbulent fields around wind turbines. To this end, we perform large-eddy simulation (LES) a turbine...
Performance of offshore wind farms built in the nearshore region will be affected by onshore terrain with higher turbulence flow when is blowing from land toward sea. Current study employs large-eddy simulation to investigate effect coastal on performance large farms. At first, two atmospheric boundary layer (ABL) cases are defined evolution an internal (IBL) during sea-to-land and land-to-sea transition flow. The growth rate IBL was similar for both ABL cases. However, mean velocity-based...
We study the near field of a zero-net-mass-flux (ZNMF) actuated round jet using direct numerical simulations. The Reynolds number ReD = 2000 and three ZNMF actuators are used, evenly distributed over circle, directed towards main jet. triggered in phase, have relatively low momentum coefficient Cμ 0.0049 each. four different control frequencies with Strouhal numbers ranging from StD 0.165 to 1.32; next that, also two uncontrolled baseline cases included study. find that this type actuation...
The stability and transition in the bottom boundary layer under a solitary wave are analysed presence of finite amplitude disturbances. First, receptivity is investigated using linear input-output analysis, which environment noise modelled as distributed body forces. most dangerous perturbations time frame until flow reversal found to be arranged counter-rotating streamwise-constant rollers. One these roller configurations then selected deployed nonlinear equations, streaks various...
Abstract
The present paper investigates high performance computing abilities of OpenFOAM for a low Reynolds number ($Re_D=2000$) axisymmetric jet subject to multiple zero net mass flux (ZNMF) actuators. First, parallel is tested by performing scaling study up $2048$ processors on supercomputer Flemish Supercomputer Center(VSC). Then, method improve the efficiency proposed. based developing hybrid concept calculate statistical moments. This new combines ensemble and time averaging in order allow data...
Majority of offshore wind farms are built in the nearshore regions, starting from a few meters to 10 20 km shores.
A bypass transition scenario in a wind-stress driven aqueous flow is analysed using temporally developing boundary layer model with accelerating surface drift velocity. The parameters of the are selected to mimic wave-tank experiment reference wind speed 5 m/s. To study processes isolation, flat free adapted, which inhibits initiation waves. First, preferred initial perturbations most sensitive identified linear non-normal growth theory. These arranged as streamwise-constant vortex pairs...
Estimation of interface curvature in surface-tension dominated flows is a remaining challenge Volume Fluid (VOF) methods. Data-driven methods are recently emerging as promising alternative this domain. They outperform conventional on coarser grids but diverge with grid refinement. Furthermore, unlike methods, data-driven sensitive to coordinate system and sign conventions, thus often fail capture basic symmetry patterns interfaces. The present work proposes new strategy which conserves the...
This study employs large-eddy simulations to investigate the effect wind farm layout on flow fields and performance of offshore farm. To that end, four layouts (two aligned two staggered) are defined over fixed area. From field analysis, it can be observed speeds upstream each turbine relatively higher in staggered configuration due larger streamwise spacing. Unlike what have high- low-speed columns, farms evenly distributed fields. Regarding power output, fully generate 25% than case with same