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ten Eikelder, M.F.P. (author), Akkerman, I. (author)This paper presents the construction of novel stabilized finite element methods in the convective–diffusive context that exhibit correct-energy behavior. Classical stabilized formulations can create unwanted artificial energy. Our contribution corrects this undesired property by employing the concepts of dynamic as well as orthogonal small...journal article 2018
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ten Eikelder, M.F.P. (author), Akkerman, I. (author)This paper presents the construction of a correct-energy stabilized finite element method for the incompressible Navier–Stokes equations. The framework of the methodology and the correct-energy concept have been developed in the convective–diffusive context in the preceding paper [M.F.P. ten Eikelder, I. Akkerman, Correct energy evolution of...journal article 2018
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Coppens, Jessica (author), Dangal, Sagar (author), Vendel, M.E. (author), Anjani, S. (author), Akkerman, Stefan (author), Hiemstra-van Mastrigt, S. (author), Vink, P. (author)The airplane (de)boarding process is not organized optimally. The goal of this paper is to search for improvement possibilities. In this paper literature is reviewed, boarding characteristics are studied in a field study and a pilot study with a new way of hand luggage stowing is performed. Computer simulations indicate that there are more...journal article 2018
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Akkerman, I. (author)In this paper we present a level-set approach that addresses two issues that can occur when the level-set approach is used to simulate two-fluid flows in engineering practice.<br/>The first issues is that of smoothing of the Heaviside on arbitrary meshes. It is shown that the Heaviside can be non-smooth on non-uniform meshes. Alternative...journal article 2017
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- Chang, Xing (author), Akkerman, I. (author), Veldman, A.E.P. (author), Huijsmans, R.H.M. (author) conference paper 2016
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- Hosseini, S.M. (author), Akkerman, I. (author), Veldman, A.E.P. (author), Huijsmans, R.H.M. (author) conference paper 2016
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Chang, X. (author), Akkerman, I. (author), Huijsmans, R.H.M. (author), Veldman, A.E.P. (author)The CFD simulation tool ComFLOW is extended to investigate the characteristics of wave motions in the presence of steady uniform currents. Initially, the inflow boundary is the superposition of waves and current. Effect of the latter on the former is resolved by solving Navier-Stokes equations within the domain as a next step. A Generating and...conference paper 2016
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Akkerman, M. (author), Khanh, N.T. (author), Witter, M. (author), Rutten, M.M. (author)Recently, the changes in laws and regulations, such as the revised Law on Water Resources in 2012, have sought to provide a legal framework for the internationally recognized practices of Integrated Water Resources Management (IWRM) in Vietnam. With IWRM being a novel approach for Vietnam, it would be interesting to evaluate how well water...conference paper 2015
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Bor, T.C. (author), Warnet, L.L. (author), Akkerman, R. (author)Continuous fiber reinforced composite materials are susceptible to delamination upon impact. Shape Memory Alloy (SMA) wires can be used to assist the healing of damage employing various known or new healing methodologies. Upon a local heating stimulus the contracting action of pre-strained wires, oriented parallel to the out-of-plane direction...conference paper 2013
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Palacios-Aguilera, N.B. (author), Bastemeijer, J. (author), Mollinger, J.R. (author), Bossche, A. (author), Mokkapati, V.R.S.S. (author), Visser, H.A. (author), Akkerman, R. (author)Nowadays, micro- and nanochips are usually fabricated with Silicon and/or glass. A simple, low-cost and reliable integration packaging method that provides flexibility to the incorporation of electronic and fluidic devices into a system has not been fully developed yet. The use of Printed Circuit Board material as substrate to create dry film...journal article 2012
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Verheij, H.J. (author), Hoffmans, G. (author), Den Adel, H. (author), Akkerman, G.J. (author), Giri, S. (author)A desk study has been carried out regarding interface stability of granular filter structures. Actually, the project focuses on two particular aspects: (1) interface stability as function of the thickness of the filter layer consisting of standard armourstone gradings, and (2) interface stability of gravel mixtures with a wide gradation The...report 2009
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Akkerman, I. (author)A Residual-Based Large-Eddy Simulation (RB-LES) method is developed. This is done by discretizing the Navier-Stokes equations directly. A priori filtering is omitted. Analytical approximation of the subgrid scales results in a unusually-stabilized finite-element method with additional terms arising due to the nonlinearity. This RB-LES method is...doctoral thesis 2009
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- Akkerman, S.D. (author) master thesis 2009
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Akkerman, I. (author), Bazilevs, Y. (author), Calo, V.M. (author), Hughes, T.J.R. (author), Hulshoff, S. (author)This paper examines the role of continuity of the basis in the computation of turbulent flows. We compare standard finite elements and non-uniform rational B-splines (NURBS) discretizations that are employed in Isogeometric Analysis (Hughes et al. in Comput Methods Appl Mech Eng, 194:4135–4195, 2005). We make use of quadratic discretizations...journal article 2007
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van Gerven, K.A.J. (author), Akkerman, G.J. (author)The present report deals with the application of a provisional Smart Grass Reinforcement (SGR) system in 2006 for full scale testing of increased overtopping at the Groningen sea dyke test section near Delfzijl, as envisaged in 2007. The SGR has been placed at two strips of 4 m wide: one primary strip at the basic test site and one at a...report 2007
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Akkerman, G.J. (author), van Gerven, K.A.J. (author), Schaap, H.A. (author), van der Meer, J.W. (author)In the present report field erosion tests of the inner slope of a sea dyke in the province of Groningen (near Delfzijl) are described for the situation of severe wave overtopping. Three types of tests have been performed: tests at the present grass cover, tests at a reinforced grass cover and tests at a section of bare clay. At the reinforced...report 2007
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de Jong, W. (author), Akkerman, G.J. (author)Overzicht van de beschikbare kennis over het functioneren van rivierkribben in binnen- en buitenland. Overzicht van zowel doorlatende en ondoorlatende kribben. Met name ervaringen uit de USA en uit India. Ook flexibele kribben komen aan de orde.report 2006
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Flikweert, J.J. (author), Akkerman, G.J. (author)Het voorliggende rapport geeft een samenvatting en totaaloverzicht van de inhoudelijke resultaten tot dusver in het Onderzoeksprogramma Kennisleemtes Steenbekledingen (OKS). Het betreft fase 2 van project Evaluatie en Bijsturing OKS. Tezamen met de evaluatie van het proces in fase 1, vormt deze vastlegging van de inhoud een basis voor het komen...report 2005
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- Akkerman, I. (author), Hulshoff, S.J. (author) report 2005
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Van Gerven, K.A.J. (author), Van der Meer, J.W. (author), Van Heereveld, M.A. (author), Akkerman, G.J. (author)The present proposal deals with a presentation of three potentially feasible concepts for strengthening of the sea defences as to allow for increased wave overtopping, within the framework of ComCoast. In addition, for each concept an indicative proposal is given for a further theoretical study (Phase 2) and an indicative approach is shown for...report 2005