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De Proft, K. (author), Heyens, K. (author), Sluys, L.J. (author)
This paper uses the Generalized Finite Element method for the introduction of the cohesive joint behaviour to model masonry. Cracked joints are modelled as displacement discontinuities and are introduced in the finite element model by additional degrees of freedom. These degrees of freedom are activated when the stress state in the joint reaches...
conference paper 2009
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Heyens, K. (author), De Proft, K. (author), Sluys, L.J. (author)
A smooth yield surface for the modelling of masonry on mesoscopic scale is presented, using interpolation by second order Bzier curves. The cracked joints are modelled as displacement discontinuities using the partition of unity property of finite element shape functions.
conference paper 2009
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Nguyen, V.P. (author), Stroeven, M. (author), Sluys, L.J. (author)
In this contribution, we present the mechanical behaviour of the hardening cement paste explicitly taking into account its complex microstructure. The microstructure of the cement paste is obtained via numerical cement hydration simulation. A simple nonlocal isotropic damage model is adopted for different constituents of the cement paste. The...
conference paper 2009
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Lloberas Valls, O. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author)
In this contribution we describe a methodology for the study of softening brittle materials at different scales of observation. The goal is to account for a higher resolution at those areas that undergo the non-linear processes. We apply the FETI (Finite Element Tearing and Interconnecting) technique to glue different domain resolutions during...
conference paper 2009
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Shabir, Z. (author), Van der Giessen, E. (author), Duarte, C.A. (author), Simone, A. (author)
Two different approaches to intergranular crack propagation in brittle polycrystals are contrasted. Crack paths resulting from a method that allows a detailed description of the stress field within a polycrystal are compared to cracks dictated by topological considerations. In the first approach, a fracture path is determined with a Generalized...
conference paper 2009
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Dias-da-Costa, D. (author), Alfaiate, J. (author), Júlio, E. (author), Sluys, L.J. (author)
Some of the most used strengthening techniques for reinforced concrete structures include the increase of existing cross-sections. The monolithic behaviour of the strengthened elements depends basically on the interface between the substrate and the new concrete layer. A complete numerical model capable of dealing with the composite response of...
conference paper 2009
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Radtke, F.K.F. (author), Simone, A. (author), Sluys, L.J. (author)
We present two approaches to model fibre reinforced concrete. In both approaches, discrete fibre distributions and the behaviour of the fibre-matrix interface are explicitly considered. One approach employs the reaction forces from fibre to matrix while the other is based on the partition of unity finite element method. In none of the methods...
conference paper 2009
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Moonen, P. (author), Sluys, L.J. (author), Carmeliet, J. (author)
A continuous-discontinuous approach to simulate failure is presented. The formulation covers both diffuse damage processes in the bulk material as well as the initiation and propagation of discrete cracks. Comparison with experimental data on layered sandstone shows that the modeling strategy accurately captures the physics of the failure process.
conference paper 2009
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Talebian, M. (author), Al-Khoury, R.I.N. (author), Sluys, L.J. (author)
This paper presents an efficient computational model for the simulation of fully coupled two-phase flow in a deformed partially saturated formation. Focus is placed on modeling the flow of a CO2 plume in a porous medium. The numerical procedure is based on coupling between the Level-set method (LS) and the extended finite element method (XFEM)....
conference paper 2011
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Scholcz, T.P. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)
High fidelity analysis of fluid-structure interaction systems is often too timeconsuming when a large number of model evaluations are required. The choice for a solution procedure depends often on the efficiency of the method and the possibility of reusing existing field solvers. Aggressive Space-Mapping, a technique originally developed for...
conference paper 2011
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Kreeft, J.J. (author), Weghs, M. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)
Two reduced order models are presented for the simulation of physically strong coupled fluid-structure interaction problem, based on computationally partitioned flow and structure solvers. The reduced order models used are a class of quasi-Newton coupling methods to obtain a stable solution and to reduce the number of subiterations. The second...
conference paper 2011
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Sterenborg, J.J.H.M. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)
In order to validate fluid-structure interaction solvers, a one degree of freedom (1 DOF) aeroelastic experiment is performed. A rigid wing with an harmonically actuated flap, is suspended by springs to allow a free heaving motion. Displacements and time dependent aerodynamic forces are measured for reduced flap frequencies ranging from k = 0.1...
conference paper 2011
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Kazemi Kamyab, V. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)
The application of higher order implicit time integration schemes to conjugate heat transfer problems is analyzed with Dirichlet-Neumann as the decomposition method. In the literature, only up to second order implicit time integration schemes have been reported while there is a potential for gaining computational efficiency using higher orders....
conference paper 2011
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Van Zuijlen, A.H. (author), Bijl, H. (author)
Computational fluid-structure interaction is commonly performed using a partitioned approach. For strongly coupled problems sub-iterations are required, increasing computational time as flow and structure have to be resolved multiple times every time step. Reductions in computing times can be achieved by e.g. improving the convergence of the sub...
conference paper 2011
document
Lloberas Valls, O. (author), Rixen, D.J. (author), Simone, A. (author), Sluys, L.J. (author)
In this contribution we describe a methodology for the multiscale analysis of heterogeneous quasi-brittle materials. The algorithm is based on the finite element tearing and interconnecting FETI [1] method cast in a non-linear setting. Adaptive multiscale analysis is accounted for with the use of selective refinement at domains that undergo...
conference paper 2011
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Duz, B. (author), Huijsmans, R.H.M. (author), Veldman, A.E.P. (author), Borsboom, M.J.A. (author), Wellens, P.R. (author)
In this paper the use of an absorbing boundary condition (ABC) is investigated for the numerical simulation of regular and irregular waves in three dimensional computational domains where Navier-Stokes equations describe the motion of the fluid. The numerical implementation of the ABC using a staggered grid arrangement is explained in detail....
conference paper 2011
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Toxopeus, S.L. (author)
In the SIMMAN 2008 workshop, the capability of CFD tools to predict the flow around manoeuvring ships has been investigated. It was decided to continue this effort but to extend the work to the flow around ships in shallow water. In this paper, CFD calculations for the KLVCC2 are presented. The aim of the study is to verify and validate the...
conference paper 2011
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Luppes, R. (author), Duz, B. (author), Van der Heiden, H.J.L. (author), Van der Plas, P. (author), Veldman, A.E.P. (author)
The simulation tool ComFLOW, developed for accurate predictions of hydrodynamic wave loading, is based on the Navier-Stokes equations. The free-surface dynamics is described through VOF, with local height-function approach to enhance accuracy. Numerical reflections are prevented by specially designed absorbing boundary conditions. Gravity...
conference paper 2011
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Stroeven, P. (author), Le, N.L.B. (author), Stroeven, M. (author), Sluys, L.J. (author)
The paper introduces a novel approach to porosimetry in virtual concrete, denoted as random node structuring (RNS). The fresh state of this particulate material is produced by the DEM system HADES. Hydration simulation is a hybrid approach making use of wellknown discretization and vector methods. Particle interferences (overlap) in the dynamic...
conference paper 2011
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Vrouwe, I. (author), Feijen, M. (author), Houtnam, R. (author), Borgart, A. (author)
In this paper different qualities of architectural textile techniques and tectonics are explored. By using a reframing strategy micro techniques and tectonics as used in fashion and textile design are evolved into an architectural scale. To reveal the quality of this reframing procedure a case scenario has been executed. By reframing patchwork...
conference paper 2011
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