Searched for: author:"Akkerman, I."
(1 - 13 of 13)
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ten Eikelder, M.F.P. (author), Akkerman, I. (author)
This paper presents the notion of a variation entropy. This concept is an entropy framework for the gradient of the solution of a conservation law instead of on the solution itself. It appears that all semi-norms are admissible variation entropies. This provides insight into the total variation diminishing property and justifies it from...
journal article 2019
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Helgedagsrud, Tore (author), Akkerman, I. (author), Bazilevs, Yuri (author), Mathisen, Kjell (author), Øiseth, Ole (author)
Computational fluid dynamics (CFD) and fluid–structure interaction (FSI) are growing disciplines in the aeroelastic analysis and design of long-span bridges, which, with their bluff body characteristics, offer major challenges to efficient simulation. In this paper, we employ isogeometric analysis (IGA) based on nonuniform rational B-splines ...
journal article 2019
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Akkerman, I. (author), ten Eikelder, M.F.P. (author)
This paper presents a new monolithic free-surface formulation that exhibits correct kinetic and potential energy behavior. We focus in particular on the temporal energy behavior of two-fluids flow with varying densities. Correct energy behavior here means that the actual energy evolution of the numerical solution matches the evolution as...
journal article 2019
document
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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Gadi, Ratnakar (author), Huijsmans, R.H.M. (author), Akkerman, I. (author), van 't Veer, A.P. (author)
conference paper 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
document
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, 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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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
document
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
document
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
document
Akkerman, I. (author), Hulshoff, S.J. (author)
report 2005
Searched for: author:"Akkerman, I."
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