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Simulating Dynamic Stall in a 2D VAWT: Modeling strategy, verification and validation with Particle Image Velocimetry data

Ferreira, C.J.S. (author), Bijl, H. (author), Van Bussel, G. (author), Van Kuik, G. (author)

journal article 2007

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An integrated approach for efficient biomethane production from solid bio-wastes in a compact system

Wang, H. (author), Tao, Y. (author), Temudo, M. (author), Schooneveld, M. (author), Bijl, H. (author), Ren, N. (author), Wolf, M. (author), Heine, C. (author), Foerster, A. (author), Pelenc, V. (author), Kloek, J. (author), Van Lier, J.B. (author), De Kreuk, M.K. (author)

Background Solid bio-wastes (or organic residues) are worldwide produced in high amount and increasingly considered bioenergy containers rather than waste products. A complete bioprocess from recalcitrant solid wastes to methane (SW2M) via anaerobic digestion (AD) is believed to be a sustainable way to utilize solid bio-wastes. However, the...

journal article 2015

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Influence of wing kinematics on aerodynamic performance in hovering insect flight

Bos, F.M. (author), Lentink, D. (author), Van Oudheusden, B.W. (author), Bijl, H. (author)

The influence of different wing kinematic models on the aerodynamic performance of a hovering insect is investigated by means of two-dimensional time-dependent Navier–Stokes simulations. For this, simplified models are compared with averaged representations of the hovering fruit fly wing kinematics. With increasing complexity, a harmonic model,...

journal article 2007

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Higher Period Stochastic Bifurcation of Nonlinear Airfoil Fluid-Structure Interaction

Witteveen, J.A.S. (author), Bijl, H. (author)

The higher period stochastic bifurcation of a nonlinear airfoil fluid-structure interaction system is analyzed using an efficient and robust uncertainty quantification method for unsteady problems. The computationally efficient numerical approach achieves a constant error with a constant number of samples in time. The robustness of the method is...

journal article 2009

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Probabilistic collocation used in a Two-Step approached for efficient uncertainty quantification in computational fluid dynamics

Loeven, G.J.A. (author), Bijl, H. (author)

In this paper a Two-Step approach is presented for uncertainty quantification for expensive problems with multiple uncertain parameters. Both steps are performed using the Probabilistic Collocation method. The first step consists of a sensitivity analysis to identify the most important parameters of the problem. The sensitivity derivatives are...

journal article 2009

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A monomial chaos approach for efficient uncertainty quantification on nonlinear problems

Witteveen, J.A.S. (author), Bijl, H. (author)

A monomial chaos approach is presented for efficient uncertainty quantification in nonlinear computational problems. Propagating uncertainty through nonlinear equations can be computationally intensive for existing uncertainty quantification methods. It usually results in a set of nonlinear equations which can be coupled. The proposed monomial...

journal article 2008

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Numerical Investigation on the Propulsive Performance of Biplane Counter-flapping Wings

Deng, S. (author), Xiao, T. (author), Van Oudheusden, B.W. (author), Bijl, H. (author)

A numerical investigation is performed to address the flexing effect on the propulsion performance of flapping wing particularly on the counter-flapping wings of the biplane configuration. A Reynolds number of 10,000 is considered in the present study which corresponds to the flight regime of most existing flapping wing micro air vehicles. The...

journal article 2015

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The aero-acoustic resonance behavior of partially covered slender cavities

De Jong, A.T. (author), Bijl, H. (author), Scarano, F. (author)

The present investigation focuses on the aero-acoustic resonance of cavities with a width much larger than their length or depth and partially covered, as often encountered in automotive door gaps. The cavities are under influence of a low Mach number flow with a relatively thick boundary layer. Under certain conditions, these cavities can...

journal article 2011

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Investigation of higher spanwise Helmholtz resonance modes in slender covered cavities

De Jong, A.T. (author), Bijl, H. (author)

Cavity aeroacoustic noise is relevant for aerospace and automotive industries and widely investigated since the 1950s. Most investigations so far consider cavities where opening length and width are of similar scale. The present investigation focuses on a less investigated setup, namely cavities that resemble the door gaps of automobiles. These...

journal article 2010

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A TVD uncertainty quantification method with bounded error applied to transonic airfoil flutter

Witteveen, J.A.S. (author), Bijl, H. (author)

The Unsteady Adaptive Stochastic Finite Elements (UASFE) approach is a robust and efficient uncertainty quantification method for resolving the effect of random parameters in unsteady simulations. In this paper, it is shown that the underlying Adaptive Stochastic Finite Elements (ASFE) method for steady problems based on Newton-Cotes quadrature...

journal article 2009

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Aerodynamic Experiments on DelFly II: Unsteady Lift Enhancement

De Clercq, K.M.E. (author), De Kat, R. (author), Remes, B. (author), Van Oudheusden, B.W. (author), Bijl, H. (author)

Particle image velocimetry measurements and simultaneous force measurements have been performed on the DelFly II flapping-wing MAV, to investigate the flow-field behavior and the aerodynamic forces generated. For flapping wing motion it is expected that both the clap and peel mechanism and the occurrence of a leading edge vortex during the...

journal article 2009

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An automated approach for solution based mesh adaptation to enhance numerical accuracy for a given number of grid cells

Lucas, P. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)

Mesh adaptation is a fairly established tool to obtain numerically accurate solutions for flow problems. Computational efficiency is, however, not always guaranteed for the adaptation strategies found in literature. Typically excessive mesh growth diminishes the potential efficiency gain. This paper, therefore, extends the strategy proposed by ...

journal article 2009

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Higher period stochastic bifurcation of nonlinear airfoil fluid-structure interaction

Witteveen, J.A.S. (author), Bijl, H. (author)

journal article 2009

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Experimental and numerical investigations of aerodynamic loads and 3D flow over non-rotating MEXICO blades

Zhang, Y. (author), Gillebaart, T. (author), van Zuijlen, A.H. (author), van Bussel, G.J.W. (author), Bijl, H. (author)

This paper presents the experimental and numerical study on MEXICO wind turbine blades. Previous work by other researchers shows that large deviations exist in the loads comparison between numerical predictions and experimental data for the rotating MEXICO wind turbine. To reduce complexities and uncertainties, a non-rotating experimental...

journal article 2017

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Effectiveness of Side Force Models for Flow Simulations Downstream of Vortex Generators

Florentie, L. (author), van Zuijlen, A.H. (author), Hulshoff, S.J. (author), Bijl, H. (author)

Vortex generators (VGs) are a widely used means of flow control, and predictions of their influence are vital for efficient designs. However, accurate CFD simulations of their effect on the flow field by means of a body fitted mesh are computationally expensive. Therefore the BAY and jBAY models, which represent the effect of VGs on the flow...

journal article 2017

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A comparison of Rosenbrock and ESDIRK methods combined with iterative solvers for unsteady compressible flows

Blom, D.S. (author), Birken, Philipp (author), Bijl, H. (author), Kessels, F.J.M. (author), Meister, Andreas (author), van Zuijlen, A.H. (author)

In this article, we endeavour to find a fast solver for finite volume discretizations for compressible unsteady viscous flows. Thereby, we concentrate on comparing the efficiency of important classes of time integration schemes, namely time adaptive Rosenbrock, singly diagonally implicit (SDIRK) and explicit first stage singly diagonally...

journal article 2016

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Surrogate based wind farm layout optimization using manifold mapping

Kaja Kamaludeen, Shaafi M. (author), van Zuijlen, A.H. (author), Bijl, H. (author)

High computational cost associated with the high fidelity wake models such as RANS or LES serves as a primary bottleneck to perform a direct high fidelity wind farm layout optimization (WFLO) using accurate CFD based wake models. Therefore, a surrogate based multi-fidelity WFLO methodology (SWFLO) is proposed. The surrogate model is built...

journal article 2016

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Reconstructing geographical boundary conditions for palaeoclimate modelling during the Cenozoic

Baatsen, Michiel (author), Van Hinsbergen, Douwe J J (author), Von Der Heydt, Anna S. (author), Dijkstra, Henk A. (author), Sluijs, Appy (author), Abels, H.A. (author), Bijl, Peter K. (author)

Studies on the palaeoclimate and palaeoceanography using numerical model simulations may be considerably dependent on the implemented geographical reconstruction. Because building the palaeogeographic datasets for these models is often a time-consuming and elaborate exercise, palaeoclimate models frequently use reconstructions in which the...

journal article 2016

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Numerical Simulation of a Flexible X-Wing Flapping-Wing Micro Air Vehicle

Deng, S. (author), Perçin, M. (author), van Oudheusden, B.W. (author), Bijl, H. (author), Remes, B.D.W. (author), Xiao, T (author)

journal article 2017

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First Tests on the Symmetrical Breakwater Armor Unit Crablock

Salauddin, M (author), Broere, A. (author), van der Meer, J.W. (author), Verhagen, H.J. (author), Bijl, E (author)

Single layer concrete armor systems are being widely used nowadays in the design of rubble mound breakwaters. Recently, a new concrete armor unit has been developed and applied as single layer armor system in the repair works of one damaged breakwater at Al Fujeirah, UAE. It has a symmetrical shape, in contrast to most other units. Modern...

journal article 2017