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departmentresearch group programmeprojectcoordinates)uuid:95a439c716a543089808ced78d3febd3Dhttp://resolver.tudelft.nl/uuid:95a439c716a543089808ced78d3febd3HExperimental and computational investigation of gas diffusion in bitumenJing, R. (TU Delft Pavement Engineering); van Lent, Diederik (TNO); Kasbergen, C. (TU Delft Pavement Engineering); Scarpas, Athanasios (TU Delft Pavement Engineering); Liu, X. (TU Delft Pavement Engineering); Erkens, Sandra (TU Delft Pavement Engineering)When oxygen diffuses in a bituminous film, it also reacts, simultaneously, with the constituents of the bitumen and as such it is gradually depleted. This depletion process masks the characteristics of the actual diffusion process and complicates the determination of the diffusion coefficient needed for computation of oxygen concentration and its effects on bitumen degradation due to aging. In the present study, experiments were carried out to measure objectively oxygen absorption in bitumen at various temperatures independently of oxygen depletion phenomena. To achieve this, an improved version of van Oort s test set up was utilized and oxygen was replaced by nitrogen. A Laplace transform based numerical technique was developed for processing the test results to determine the diffusion coefficients under various conditions. Once validated, they were used in finite element simulations to demonstrate the influence of time and temperature on gas diffusion and concentration in porous asphalt mixtures.\Gas diffusion; Laplace transform; theorem of Residues; finite element method; porous asphaltenconference paper)uuid:7b552b68ab53465fb0b6ff3937fc60c4Dhttp://resolver.tudelft.nl/uuid:7b552b68ab53465fb0b6ff3937fc60c4>Geotechnical Ultimate Limit State Design Using Finite ElementsBrinkgreve, R.B.J.; Post, M.Displacementbased finite element calculations are primarily used for serviceability limit state (SLS) analysis, but the finite element method also offers possibilities for ultimate limit state (ULS) design in geotechnical engineering. The combined use of SLS and ULS calculations with partial safety factors according to the different design approaches in the Eurocode 7 can be timeconsuming and prone to error. In this paper a Design Approaches facility is presented for an efficient use of partial safety factors in a finite element environment. In addition to a description of the methods used in this facility, an example is elaborated involving the geotechnical design of a sheetpile wall supported excavation using different design approaches.>finite element method; SLS; ULS; Eurocode 7; design approaches IOS Press!Civil Engineering and GeosciencesGeoscience and Engineering)uuid:605fb53c161642818112468e2b58dd0aDhttp://resolver.tudelft.nl/uuid:605fb53c161642818112468e2b58dd0a>Geotechnical Ultimate Limit State Design using Finite Elements>design approaches; finite element method; SLS; ULS; Eurocode 7)uuid:a165cfbb0e894c46ae2859665fbdfd95Dhttp://resolver.tudelft.nl/uuid:a165cfbb0e894c46ae2859665fbdfd95qReliability Analysis of an Anchored Contiguous Pile Wall in Ankara Clay with the Random Set Finite Element MethodAkbas, S.O.; Kokten, O.>A deep excavation application characterized by imprecise data and lack of adequate information is used to demonstrate the efficiency, applicability, and validity of the random set theory in combination with finite element method (RSFEM). A case history of an anchored contiguous pile wall in overconsolidated fissured Ankara Clay constructed for supporting the 15 m deep basement excavation of a nursing house in Seyranbaglari district of Ankara is considered. Existing buildings around the excavation area necessitated a careful examination of the wall deformations and the reliability of the system as a whole. However, the geotechnical parameters of the soil had to b< e estimated combining the results of very limited insitu and laboratory tests with those obtained through previous experience of finite element analyses under similar conditions, i.e., expert knowledge. Plane strain finite element analyses were then performed to predict the contiguous pile retaining wall behavior. The parameters in the random set finite element model were chosen according to sensitivity analyses. Most likely bounds of the wall horizontal deformations were compared with those obtained from inclinometer readings. As suggested by previous case histories, wall deformations were observed to fall within the lower third of the range predicted by RSFEM9random set theory; finite element method; deep excavation)uuid:2ae20baf9e5a456eadc876b14d9ab3a4Dhttp://resolver.tudelft.nl/uuid:2ae20baf9e5a456eadc876b14d9ab3a4YProbabilistic Slope Stability Analyses Using Limit Equilibrium and Finite Element MethodsAkbas, B.; Huvaj, N.This paper compares the results of different probabilistic approaches and emphasizes the necessity of probabilistic analyses in slope stability studies. To do that, Limit Equilibrium Method (LEM) and Finite Element Method (FEM) are utilized and their outputs are compared in terms of probability of failure (PF), reliability index (RI), factor of safety (FS) and the failure surface. Lastly, concept of Random Finite Element Method (RFEM) is studied and effects of spatial correlation distance are investigatedilandslide; deterministic; probabilistic; failure surface; limit equilibrium method; finite element method)uuid:3460b1dce69f440688370112c2ec301aDhttp://resolver.tudelft.nl/uuid:3460b1dce69f440688370112c2ec301a^Whole failure process analysis for jointed rock masses based on coupling method of DDA and FEMSu, H.Z.; Wen, Z.; Yang, M.The elasticplastic mechanical behaviour is a typical characteristic of rock mass. The load action will bring on the local destruction, large deformation, even whole failure of rock mass with the discontinuous mediums (e.g. joint, crack and fault). It is a coupling process of the continuous deformation and the discontinuous deformation. The discontinuous deformation analysis (DDA) and finite element method (FEM) are combined to build the elasticplastic mechanical model. The rock block is divided into the finite element meshes. FEM is used to solve the displacement field and the stress field inside the block. The contacts between the deformable blocks are simulated DDA method. The parametric variational principle is derived to analyze the elasticplastic problem with above coupling model. The theoretical calculating formulae are obtained from the variational principle. The governing equations of mechanical model are established. The proposed method coupling DDA and FEM is used to implement the simulation and analysis for the deformation process of jointed rock masses around one underground cavern. It is easy to simulate the whole process from plastic to elastic yielding failure, and to the large deformation under the condition of plastic flow or instability.ocoupling method; jointed rock masse; failure process; discontinuous deformation analysis; finite element method)uuid:b8fe63adcbd94f42a286dd42a5e3d32aDhttp://resolver.tudelft.nl/uuid:b8fe63adcbd94f42a286dd42a5e3d32aComputation of the flashtemperature at the wheelrail contact using a 3D finite element model and its comparison with analytical methodsJNaeimi, M.; Li, Z.; Dollevoet, R.P.B.J.; Wu, J.; Petrov, R.H.; Sietsma, J.BThe coupled mechanical thermal behaviour of wheel and rail materials under rolling contact is studied to determine the temperature rise due to the frictional heat. The wheel rail frictional rolling contact problem is solved using the three dimensional finite element (FE) method. The FE model considers the wheel tread rail top contact with partialslip and converts the frictional energy into the heat as an attempt to estimate the temperature rise. Instead of assuming a global sliding velocity (a conventional premise in the field), the relative velocities of wheelrail nodes in t< he contact patch are automatically taken into account in the coupled analysis (instantaneous microslip in contact points). Different levels of traction forces are studied which determine the amounts of frictional energy. The thermal properties are specified for the materials. Defining the contact regions of the wheel and rail as the thermal conduction boundary conditions, the frictional energy is converted into heat within the contact interface. After generating the energy flux, the heat conduction occurs in three dimensions both in the wheel and rail. A steady state implicit analysis is considered for the thermal solver, whereas the mechanical solver benefits from an explicit solution scheme. Distributions of stresses and temperatures in the contact patch are made available by analysing various loading conditions. Considering the formulations offered by three analytical methods in the literature, the results of rail temperature i.e. longitudinal distributions and peak values are calculated. Though they are much more simplified problems, these analytical methods are considered as the reference models (benchmark) for comparison. The same input data are used for all the reference models to enable the comparison. The outputs of numerical simulations are compared with the reference data, with discussion on similarities and discrepancies. The proposed model is able to calculate the flashtemperature in wheel and rail materials by dropping some of the conventional assumptions used in the analytical approaches.Mflashtemperature; frictional heat; wheelrail contact; finite element methodStructural Engineering)uuid:28c9e346f26547e09605ed4ba59e7f50Dhttp://resolver.tudelft.nl/uuid:28c9e346f26547e09605ed4ba59e7f50MDesign and analysis of a multicell subscale tank for liquid hydrogen storage(Tapeinos, I.; Koussios, S.; Groves, R.M.This paper outlines the structural performance of a conformable pressurizable tank consisting of intersecting spherical shells (multicell tank). Multicell tanks outrival conventional multiple cylindrical tanks in volumetric efficiency when required to fit in a rectangular envelope in the automotive industry. When pressurized, the multicell (or multibubble) tank experiences high stress concentrations at the vicinity of the junctions, and thus the concept of effectively reinforcing those regions without adding significant excess weight becomes crucial. Furthermore when applied for cryogenic medium storage the heat transfer between different bodies and generation of respective thermal stresses in such vessels makes the solution more complicated. In this paper the effect of the i) fiberreinforced materials at the membrane and ii) unidimensional carbon tows at the intersections on the structural integrity of the tank is analyzed for different loading scenarios.:conformable tanks; thermal stresses; finite element methodICCMAerospace Engineering Aerospace Structures & Materials)uuid:29f474a4b0814a2a82b9cb1ad3605433Dhttp://resolver.tudelft.nl/uuid:29f474a4b0814a2a82b9cb1ad3605433bResidual fatigue life evaluation of rail at squats seeds using 3D explicit finite element analysis&Deng, X.; Naeimi, M.; Li, Z.; Qian, Z.,A modeling procedure to predict the residual fatigue life of rail at squats seeds is developed in this article. Two models are involved: a 3D explicit Finite Element (FE) model to compute the stress and strain at squats in rail, and the JS fatigue damage model to determine the residual fatigue life on the basis of the computed stress and strain. In the FE model dynamic effects of wheelrail system under rolling contact is taken into account. Bilinear isotropic elasticplastic material properties are adopted to represent the hardening of wheel and rail. Squats are subject to multiple loading cycles. The geometry of the squat is varied in the simulation corresponding to a growing squat at different ages. It is found that small squats lead to fatigue failure while severe ones lead to ratcheting failure.\fatique life; finite element method; rolling contact fatigue; cracks initiation; rai< l squats3DCMat Ageing Centre, Delft University of Technology)uuid:452e804ae35e4a1a98ec04ee1117b918Dhttp://resolver.tudelft.nl/uuid:452e804ae35e4a1a98ec04ee1117b918JOpen source engineering and sustainability tools for the built environmentCoenders, J.L.LThis paper presents two novel open source software developments for design and engineering in the built environment. The first development, called sustainabilityopen [1], aims on providing open source design, analysis and assessment software source code for (environmental) performance of buildings, structures and infrastructure. The aim of this project is to take away barriers that might exist to design and engineer buildings, structures and infrastructure in a sustainable manner and based on quantitative measures or metrics of (environmental) performance for a variety of design aspects. The second development, called engineeringopen [2], aims on providing open source software source code for design, calculation, form finding, analysis and optimisation of structures. Both developments aim to take away restrictions that might exist for science and practice caused by the unavailability of open and insightful software source code to inspire further research, development and innovation in the architecture, engineering and construction industry for new software approaches and tools.digital design; design tools; engineering; sustainability; open source software; parametric software; BIM; finite element method; form finding; optimisation Wroclaw University of Technology)uuid:7256a2f6601b47e5bf1db25233f27e19Dhttp://resolver.tudelft.nl/uuid:7256a2f6601b47e5bf1db25233f27e19DScripting Design Supported by Feedback Loop from Structural Analysis$Kurilla, L.; Achten, H.; Florian, M.,In order to support an architects decision to evaluate and choose more efficient structural solutions in the concept design, it is necessary to establish an interactive feedback loop between structural solver and geometry modeller which would allow one to analyse a great number of solutions generated in the scripting design process. Defining a crossdisciplinary data structure as an analytical model, the communication between existing structural solver (OOFEM) and geometry modeller (Grasshopper) was established. Automation of the entire analysis process was done by the bridging tools MIDAS and Donkey, which have been developed. This paper presents the method of creation of an analytical model by Donkey, and deals with how to visualize, interpret and use the result values from the structural analysis.design tool development; computing design; decisionmaking support methods; finite element method; crossdisciplinary cooperation)uuid:9e6547d48cb04d6591616afd037dc8d6Dhttp://resolver.tudelft.nl/uuid:9e6547d48cb04d6591616afd037dc8d6rNumerical modelling of autogenous healing and recovery of mechanical properties in ultrahigh performance concrete5Hilloulin, B.; Grondin, F.; Matallah, M.; Loukili, A.Cracks, caused by shrinkage or external loading, reduce the durability of concrete structures as aggressive substances can easily enter in the capillary network of the cementitious matrix. Natural autogenous healing ability of concrete by further hydration or precipitation has been studied experimentally for many years. Autogenous healing of concrete by further hydration of residual unhydrated cement particles is triggered by the ingress of water and/or moisture into the crack and leads to a partial recovery of mechanical properties (Youngs modulus, tensile strength,...). However, theoretical studies and computer simulations still need to be developed in order to explain macroscopic behaviour of healed specimens and conditions of occurrence of the selfhealing phenomenon. In this study, a hydrochemomechanical model was developed to simulate autogenous healing by further hydration. Firstly, a simulation of a threepointbending test was performed to represent the initial damaged state before the selfhealing process. The volume fraction of the residual cement clinkers at this moment has b< een calculated with a hydration model. Then, the selfhealing phenomenon of concrete beams immersed into water was modelled based on micromechanical observations. The diffusion process has been simulated using the Ficks law in order to describe the ingress of water into concrete. The hydration model, based on the Arrhenius law, is then used to simulate the chemical reactions between residual clinkers and water. The mechanical properties of the new formed hydrates are therefore evaluated in order to describe the partial recovery of mechanical properties of healed concrete.Sconcrete; autogenous healing; finite element method; hydrochemomechanical coupling)uuid:f7de5641e1c24ff49d9cd189288ad810Dhttp://resolver.tudelft.nl/uuid:f7de5641e1c24ff49d9cd189288ad810WNumerical modeling of hydration process and temperature evolution in early age concreteDCaggiano, A.; Pepe, M.; Koenders, E.A.B.; Martinelli, E.; Etse, G.J.5Heat production induced by the hydration reaction and the resulting temperature evolution in the early phases of setting and hardening processes are critical phenomena, often leading to premature cracking of concrete members. However, the interest for simulating such phenomena is also related to the fundamental relationships between the nature of the main concrete components, such as aggregates and binders, and its mechanical properties. As a matter of principle, the actual efficiency of the concrete mix can be assessed by monitoring the hydration process and the latter can be directly related to the development of the relevant mechanical properties. This paper presents a numerical model for simulating the hydration process of cement and the resulting time evolution of temperature inside concrete. In general, boundary conditions ranging between isothermal and adiabatic situations can be considered. Then, the heatflow generated throughout the hardening concrete specimen as a result of these general boundary conditions can be simulated by the proposed model with the aim to analyze its effect on the cement hydration process and the resulting concrete maturity. After the analytical formulation of the hydration and heat transfer problems, a consistent numerical solution based on the Finite Difference (FD) technique is developed. Then, the same constitutive relationships are considered within a general Finite Element (FE) procedure. The numerical results obtained through FD and FE solutions are compared with the experimental results obtained from two concrete mixes in both adiabatic and nonadiabatic conditions. The comparison between the two numerical predictions and the corresponding experimental results confirms the accuracy of the proposed model. The FD numerical solution can be easily implemented in a spreadsheet.Tconcrete curing; finite differences; finite element method; heat transfer; hydration.Asociacin Argentina de Mecnica Computacional)uuid:55c1c5e5990243ada72462bb063c3c80Dhttp://resolver.tudelft.nl/uuid:55c1c5e5990243ada72462bb063c3c80?Constitutive model for wood based on continuum damage mechanics.Sandhaas, C.; Van de Kuilen, J.W.; Blass, H.J.S3D constitutive model wood; continuum damage mechanics (CDM); finite element method)uuid:d34104220c0f41eea2055c7b0f308d78Dhttp://resolver.tudelft.nl/uuid:d34104220c0f41eea2055c7b0f308d78EA Lagrangian simulation method for suspensions in viscoelastic fluidsMalidi, A.; Harlen, O.We present a novel Lagrangian finite element method for simulating suspensions of particles in viscoelastic fluids. We solve the flow in a unit cell containing a small number of particles with doubly periodic boundary conditions on a selfreplicating twodimensional lattice to replicate a suspension on an infinite domain. The method uses a Lagrangian finite element grid that deforms with fluid combined with a quotient representation of the periodic lattice. We show that qualitatively different results are obtained for the shearthinning pompom constitutive equation compared to those obtained using the Oldroyd B fluid. For the pompom fluid we show that the changes to shear< viscosity with the addition of particles can be obtained by a simple shifting of the shearrate and shearstress.Jviscoelastic fluid; suspensions; Lagrangian methods; finite element method)uuid:7228d5398afe43dea28737a1992c60c2Dhttp://resolver.tudelft.nl/uuid:7228d5398afe43dea28737a1992c60c2DOn Finite Element Method Application in Computational AeroelasticitySvacek, P.; Horacek, J.The paper focus on numerical approximation of the coupled of fluid and structural models in aeroelastic simulations as well as to the coupling of both models. The fluid motion is described by the incompressible Reynolds Averaged NavierStokes equations (RANS) and coupled with SpallartAlmaras turbulence model. The numerical solution by finite element method stabilized with the Galerkin Least Squares (GLS) method is applied onto RANS system of equations. The Spallart Almaras turbulence model is numerically approximated by the finite element method and streamline upwind/PetrovGalerkin (SUPG) method is employed to stabilize the convective terms. The airfoil motion is described by a system of ordinary differential equations. The airfoil motion results in deformations of the computational domain, which are treated with the aid of Arbitrary LagrangianEulerian(ALE) method. Numerical results for several model problems and comparison to NASTRAN computations as well as to available experimental data are presented.%aeroelasticity; finite element method)uuid:670951b4b1074709940de116f7328cf2Dhttp://resolver.tudelft.nl/uuid:670951b4b1074709940de116f7328cf2IAutomatic parallelization of finite element CFD code using HPC middlewareIto, S.; Okuda, H.Computational fluid analysis requires huge amounts of computational resources. However, for the usual developer, parallelization is difficult as it requires special programming skills. In this study, the HPC Middleware is employed, which supports parallelization and optimizations for easily developing parallel code. The parallel efficiency of the developed code is also discussed.6finite element method; parallel computing; PSE; HPCMW)uuid:f4844b164af64217a1f56c4a82a90de3Dhttp://resolver.tudelft.nl/uuid:f4844b164af64217a1f56c4a82a90de3GModel order reduction for large scale finite element engineering modelsRudnyi, E.B.; Korvink, J.G.jSoftware MOR for ANSYS has been developed at IMTEK in 2003. It allows us to perform model reduction directly to finite element models developed in ANSYS. The goal of the present paper is to describe progress achieved for the last two years and review our publications with application of MOR for ANSYS to various engineering problems for different domains: heat transfer, structural mechanics, thermomechanical models, and acoustics including fluidstructure interaction. We also discuss computational scalability of model reduction and the advanced development such as parametric and weakly nonlinear model reduction.cmodel order reduction; moment matching; parametric model reduction; finite element method; software)uuid:773fe178ba95470cbe7bbf91451c6459Dhttp://resolver.tudelft.nl/uuid:773fe178ba95470cbe7bbf91451c6459Algorithmic formulation and numerical implementation of coupled electromagneticinelastic continuum models for electromagnetic metal forming.Stiemer, M.; Unger, J.; Svendsen, B.; Blum, H.Electromagnetic metal forming is a contactfree highspeed forming process. The deformation of the workpiece is driven by a material body force, the Lorentz force, that results from the interaction of a pulsed magnetic field with eddy currents induced in the workpiece by the magnetic field itself. The purpose of this work is to present a fullycoupled 3D simulation of the process. For the mechanical structure a thermoelastic, viscoplastic, electromagnetic material model is relevant, which is incorporated in a largedeformation dynamic formulation. The evolution of the electromagnetic fields is governed by Maxwell equations under quasistatic conditions. Their numerical solution in 3D requires particular arrangements due to a reduced regularity at material interf< aces. Hence, Nedelec elements are employed. Coupling between the thermomechanical and electromagnetic subsystems takes the form of the Lorentz force, the electromotive intensity, and the current geometry of the workpiece. A staggered scheme based on a Lagrangian mesh for the workpiece and an ALE formulation for the electromagnetic field is utilized to solve the coupled system, guaranteeing the efficiency and accuracy of the data transfer between the two meshes.ccontinuum mechanics; electromagneticinelastic coupling; multifield problems; finite element method)uuid:829426ce15cf49faa089caaff7eb2a1cDhttp://resolver.tudelft.nl/uuid:829426ce15cf49faa089caaff7eb2a1cZStabilized finite element methods in the inertial range: Monitoring artificial dissipation
Burman, E.In this note we will first discuss finite element discretizations of the incompressible NavierStokes equations with some artificial dissipation added in the form of either a turbulence model or some numerical stabilization term. We will then review some results on interior penalty stabilized finite element methods for incompressible flow. These results depend on the regularity of the solution and are typically relevant only when the mesh parameter h is sufficiently small. In the case of high Reynolds number flow in three space dimensions it is unrealistic in most cases of industrial importance to resolve all scales and hence the computation must aim at the resolution only of the large eddies. In this case we propose to monitor the relative artificial dissipation and relate it to the power spectrum in the inertial range as a means of validation of large eddy simulations. Finally a numerical example is given on a two dimensional test case as an illustration to the discussion.6interior penalty; stabilization; finite element method)uuid:2f79e842a961416ca2b93e775fd1d37fDhttp://resolver.tudelft.nl/uuid:2f79e842a961416ca2b93e775fd1d37fSOn finite element variational multiscale methods for incompressible turbulent flowsJohn, V.; Tambulea, A.Two realizations of finite element variational multiscale (VMS) methods for the simulation of incompressible turbulent flows are studied. The difference between the two approaches consists in the way the spaces for the large scales and the resolved small scales are chosen. The paper addresses issues of the implementation of these methods, the treatment of the additional terms and equations in the temporal discretization, and the additional costs of these methods.lNavierStokes equations; incompressible turbulent flow; variational multiscale method; finite element method)uuid:671c38caa8a2432785ea64553d1527ceDhttp://resolver.tudelft.nl/uuid:671c38caa8a2432785ea64553d1527ceE3D lid driven cavity flow by mixed boundary and finite element method1Zunic, Z.; Hribersek, M.; Skerget, L.; Ravnik, J.:A numerical algorithm for the solution of the velocityvorticity formulation of NavierStokes equations is presented. This formulation results in splitting of fluid flow into its kinematic and kinetic aspect. The Boundary Element Method (BEM) used for the solution of flow kinematics results in an implicit calculation of vorticity values at the boundary, whereas all transport equations are solved using Finite Element Method (FEM). The combination of both numerical techniques is proposed in order to increase the accuracy of computation of boundary vorticities, a weak point for a majority of numerical methods when dealing with velocityvorticity formulation. Since the application of BEM results in fully populated system matrices, also the flow kinematics computation is done by combining BEM and FEM, the latter for computation of internal velocities, keeping the CPU time and computer storage requirements at the level close to Finite Element Method. To speed up the computation process and to distribute storage of integrals over several processors the algebraic parallelization of kinematics was performed. Lid driven flow in a cubic cavity was computed to show the robustness and versatility of the proposed numerical formulation. Results fo<r Reynolds number value Re=100 and Re=1000 show good agreement with benchmark results.~incompressible viscous fluid flow; boundary element method; finite element method; parallel computation; 3D lid driven cavity)uuid:f518a5c08f1943529bf06bf57d561295Dhttp://resolver.tudelft.nl/uuid:f518a5c08f1943529bf06bf57d561295LA (dis)continuous finite element model for generalized 2D vorticity dynamics.Bernsen, E.; Bokhove, O.; Van der Vegt, J.J.W.TA mixed continuous and discontinuous Galerkin finite element discretization has been constructed for a generalized vorticitystreamfunction formulation in two spatial dimensions. This formulation consists of a hyperbolic (potential) vorticity equation and a linear elliptic equation for a (transport) streamfunction. The advantages of this finiteelement model are the allowance of complex shaped domains and (fixed) mesh refinement, and a (spatial) discretization preserving energy and vorticity, while the discrete enstrophy is L2stable. Verification examples support our error estimates. The method is fully described in Bernsen et al. (2005, 2006). To illustrate our method, we therefore focus here on finiteelement simulations of curved critical layers in two dimensional vortical flows using our (dis)continuous Galerkin finite element method.Ifinite element method; (dis)continuous Galerkin; streamfuncion; vorticity)uuid:4a0e9107374a4491954f8f2ee24c9c4aDhttp://resolver.tudelft.nl/uuid:4a0e9107374a4491954f8f2ee24c9c4aVEnergy stable finite element schemes and their applications to twofluid flow problems
Tabata, M.~We present energy stable finite element schemes for twofluid problems with interfacial tension. The interface is captured by solving numerically ordinary differential equations and the interface tension is brought in into the weak formulation of the finite element scheme. Some numerical results of rising bubble problems show the robustness and the applicability of these schemes.}energy stable scheme; finite element method; twofluid flow problems; interfacial tension; NavierStokes equations; curvature)uuid:498a90f9dc5c4b65a0c8a83f86559b56Dhttp://resolver.tudelft.nl/uuid:498a90f9dc5c4b65a0c8a83f86559b56TA numerical investigation of the boundary commutation error in large eddy simulationBorggaard, J.; Iliescu, T.;The boundary commutation error in large eddy simulation is studied numerically. It is shown that an accurate representation of the boundary commutation error has an important role in a reliable large eddy simulation of wall bounded flows. The numerical experiments in this paper are conducted for a 2D channel flow.xlarge eddy simulation; boundary conditions; boundary commutation error; approximate deconvolution; finite element method
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