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- Moeyes, G. (author), Gerritsma, J. (author), Meijer, M.C. (author) conference paper 1971
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- Gerritsma, J. (author) conference paper 1974
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- Gerritsma, M.I. (author), Vos, P. (author), Van der Steen, J.B. (author) conference paper 2008
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- Gerritsma, J. (author), Keuning, J.A. (author) conference paper 1985
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Kwakkel, M. (author), Gerritsma, M.I. (author)In this work a new approach to time dependent problems in combination with the Least-Squares Spectral Element Method (LSQSEM) will be discussed. Various timestepping formulations will be presented. These time-stepping formulations will be compared to the full space-time formulation. It will be shown that time-stepping formulations give accurate...conference paper 2006
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Kwakkel, M. (author), Gerritsma, M.I. (author)In this work a new approach to time dependent problems in combination with the Least-Squares Spectral Element Method (LSQSEM) will be discussed. Various time-stepping formulations will be presented. These time-stepping formulations will be compared to the full space-time formulation. It will be shown that time-stepping formulations give accurate...conference paper 2006
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Kranenburg, W.M. (author), van Keulen, Daan (author), Gerritsma, A. (author), Huismans, Y. (author)We investigate the changes in surface water salinity intrusion lengths for estuaries around the world under influence of climate change. To do this, we make use of information from global data sets on present river geometry and present and predicted future river discharges, mean sea levels and tidal ranges, which we combine with various models...conference paper 2023
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Zhang, Y. (author), Jain, V. (author), Palha, A. (author), Gerritsma, M.I. (author)In this paper, we present a hybrid mimetic method which solves the mixed formulation of the Poisson problem on curvilinear quadrilateral meshes. The method is hybrid in the sense that the domain is decomposed into multiple disjoint elements and the interelement continuity is enforced using a Lagrange multiplier. The method is mimetic in the...conference paper 2020
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Zhang, Yi (author), Jain, V. (author), Palha, A. (author), Gerritsma, M.I. (author)In this paper, we will show that the equivalence of a div-grad Neumann problem and a grad-div Dirichlet problem can be preserved at the discrete level in 3-dimensional curvilinear domains if algebraic dual polynomial representations are employed. These representations will be introduced. Proof of the equivalence at the discrete level follows...conference paper 2020
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Jain, V. (author), Fisser, Joël (author), Palha, A. (author), Gerritsma, M.I. (author)We present a hybrid mimetic spectral element formulation for Darcy flow. The discrete representations for (1) conservation of mass, and (2) inter-element continuity, are topological relations that lead to sparse matrix systems. These constraints are independent of the element size and shape, and thus invariant under mesh transformations. The...conference paper 2020
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Gerritsma, M.I. (author), Palha, A. (author)In this paper the spectral mimetic least-squares method is applied to a two-dimensional div-curl system. A test problem is solved on orthogonal and curvilinear meshes and both h- and p-convergence results are presented. The resulting solutions will be pointwise divergence-free for these test problems. For N> 1 optimal convergence rates on...conference paper 2018
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- Gerritsma, J. (author) journal article 1977
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- Gerritsma, J. (author) journal article 1965
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- Gerritsma, J. (author), Keuning, J.A. (author) journal article 1985
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- Gerritsma, J. (author) journal article 1986
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- Gerritsma, J. (author) journal article 1982
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- Gerritsma, J. (author) journal article 1965
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- Gerritsma, J. (author) journal article 1978
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- Gerritsma, J. (author) journal article 1980
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- Gerritsma, J. (author), Beukelman, W. (author) journal article 1963