Mikko Folkersma

Mikko Folkersma
Delft University of Technology | TU · Department of Aerodynamics, Wind Energy, Flight Performance and Propulsion (AWEP)

About

22
Publications
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81
Citations

Publications

Publications (22)
Article
Full-text available
Turbulent mixing of an inclined, skewed jet injected into a crossflow is investigated using MRI-based experiments and a high-fidelity LES of the same configuration. The MRI technique provides three-dimensional fields of mean velocity and mean jet concentration. The 30° skew of the jet relative to the crossflow produces a single dominant vortex whic...
Chapter
On turbine blades, film cooling is an efficient way to prevent temperature to reach the blade material melting point, downstream the combustion chamber. Protection against continuous feeding of incoming hot gases is achieved by injecting coolant at the blade surface. To study turbulent mixing occurring in the jet vicinity we focus our attention on...
Article
Full-text available
We present a computational fluid dynamic analysis of boundary layer transition on leading edge inflatable kite airfoils used for airborne wind energy generation. Because of the operation in pumping cycles, the airfoil is generally subject to a wide range of Reynolds numbers. The analysis is based on the combination of the shear stress transport tur...
Article
Full-text available
In this paper we present a computational approach to simulate the steady-state aeroelastic deformation of a ram-air kite for airborne wind energy applications. The approach is based on a computational fluid dynamics (CFD) solver that is two-way coupled with a finite element (FE) solver. All components of the framework, including the meshing tools a...
Article
Full-text available
In this work we present Reynolds-averaged Navier-Stokes (RANS) simulations of the flow past the constant design shape of a leading-edge inflatable (LEI) wing. The simulations are performed with a steady-state solver using a k − ω SST turbulence model, covering a range of Reynolds numbers between 10 5 ≤ and ≤ 15 × 10 6 and angles of attack varying b...
Article
Full-text available
Leading-edge inflatable (LEI) kites use a pressurized tubular frame to structurally support a single skin membrane canopy. The presence of the tubes on the pressure side of the wing leads to characteristic flow phenomena for this type of kite. In this paper, we present steady-state Reynolds-Averaged Navier-Stokes (RANS) simulations for a LEI wing f...
Cover Page
Full-text available
The image shows a leading-edge inflatable (LEI) kite wing typically used for airborne wind energy applications. It is composed of a pressurized tubular frame to structurally support a single skin membrane canopy. Here, we present the results of Reynolds-Averaged Navier–Stokes (RANS) simulations for flow past the wing. The image shows a contour plot...
Article
In the past, fin-and tube heat exchanger (FTHE) tube pattern ratios have been largely based on ad-hoc design principles. Here, we investigate the optimal tube arrangements for a FTHE with plain fins in marine environments represented by two different air types; one for unfiltered air with high condensation rate and one for clean dry filtered air co...
Preprint
Steady-state Reynolds-Averaged Navier-Stokes (RANS) simulations are performed for a leading-edge inflatable wing for airborne wind energy applications. Expanding on previous work where only the inflatable leading edge tube was considered, eight additional inflatable strut tubes that support the wing canopy are now included. The shape of the wing is...
Conference Paper
Full-text available
Computational simulation of the aerodynamics of a ram-air kite for airborne wind energy applications
Presentation
Full-text available
Computational simulation of the aerodynamics of a ram-air kite for airborne wind energy applications
Poster
Full-text available
In this paper we present a computational approach to simulate the steady-state aeroelastic deformation of a ram-air kite for airborne wind energy applications. The approach is based on a computational fluid dynamics (CFD) solver that is two-way coupled with a finite element (FE) solver. All components of the framework, including the meshing tools a...
Poster
Full-text available
Airborne wind energy (AWE) aims to harness wind energy at increasing altitudes by flying a device that is tethered to the ground. One of the existing concepts consists in using a leading edge inflatable (LEI) wing composed of a circular leading edge that is connected to a very thin canopy and supported by inflated struts
Article
Full-text available
Vortex-induced vibrations (VIVs) of wind turbine towers can be critical during the installation phase, when the rotor–nacelle assembly is not yet mounted on the tower. The present work uses numerical simulations to study VIVs of a two-dimensional cylinder in the transverse direction under flow conditions that are representative of wind turbine towe...
Preprint
Full-text available
Abstract. Vortex-induced vibrations (VIV) of wind turbine towers can be critical during the installation phase, when the rotor-nacelle assembly is not yet mounted on the tower. The present work uses numerical simulations to study VIV of a two-dimensional cylinder under conditions that are representative of wind turbine towers, both from a fluid-dyn...
Thesis
Full-text available
Recent innovations in the off-shore wind industry have lead to bigger wind turbines and taller support structures. These towers can suffer from vortex-induced vibrations (VIV). The present work couples the open-source CFD solver OpenFOAM with a structural solver to investigate these fluid-structure interactions (FSI) effects in more detail. 2D simu...
Conference Paper
Full-text available
Airborne wind energy (AWE) is a novel renewable energy technology for harvesting wind energy by using kites. Compared to conventional wind turbines, the AWE systems use a lightweight structure which can reach higher altitudes where the winds are stronger and more persistent. In this work, we study the steady-state aerodynamics of a ram-air kite sec...
Preprint
Full-text available
We present a computational uid dynamic analysis of boundary layer transition on leading edge inflatable kite airfoils used for airborne wind energy generation. Because of the operation in pumping cycles, the airfoil is generally subject to a wide range of Reynolds numbers. The analysis is based on the combination of the SST turbulence model with th...

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Projects

Projects (3)
Project
Create an article and a presentation about the new features of Swiftblock and how they can be used for creating complex structured meshes for Fin-and-tube heat exchanger simulations.
Project
AWESCO was an interdisciplinary doctoral training network about an innovative renewable energy technology, combining eight academic and three industrial network partners with five associated partners, all selected on the basis of excellence and complementarity. The project has been awarded as a Marie Skłodowska Curie European Training Network within the EU framework programme Horizon 2020 (H2020-ITN-642682).