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document
Wells, G.N. (author), Sluys, L.J. (author)
Embedded discontinuity formulations have been recently presented as a method of incorporating displacement discontinuities in standard finite elements. These elements allow inelastic deformations to be modelled using discrete constitutive models at an internal interface. However, the actual formulation of these models is identical in concept to...
journal article 2001
document
De Proft, K. (author), Wells, G.N. (author), Sluys, L.J. (author), De Wilde, H.P. (author)
In this paper, a combined experimental-computational study of a double-edge notched specimen subjected to tensile loading is presented. In the experimental part, the loaddeformation response and the displacement field around the crack tip are recorded. An Electronic Speckle Pattern Interferometer (ESPI) is used to obtain the local displacement...
journal article 2002
document
Holmen, J. (author), Hughes, T.J.R. (author), Oberai, A.A. (author), Wells, G.N. (author)
The variational multiscale method has been shown to perform well for large-eddy simulation (LES) of turbulent flows. The method relies upon a partition of the resolved velocity field into large- and small-scale components. The subgrid model then acts only on the small scales of motion, unlike conventional LES models which act on all scales of...
journal article 2004
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Hughes, T.J.R. (author), Wells, G.N. (author), Wray, A.A. (author)
Energy transfers within large-eddy simulation (LES) and direct numerical simulation (DNS) grids are studied. The spectral eddy viscosity for conventional dynamic Smagorinsky and variational multiscale LES methods are compared with DNS results. Both models underestimate the DNS results for a very coarse LES, but the dynamic Smagorinsky model is...
journal article 2004
document
Kim, T.K. (author), Wells, J. (author), Kirkegaard, C. (author), Li, Z. (author), Hoffmann, S.V. (author), Gayone, J.E. (author), Fernandez-Torrente, I. (author), Häberle, P. (author), Pascual, J.I. (author), Moore, K.T. (author), Schwartz, A.J. (author), He, H. (author), Spence, J.C.H. (author), Downing, K.H. (author), Lazar, S. (author), Tichelaar, F.D. (author), Borisenko, S.V. (author), Knupfer, M. (author), Hofmann, Ph. (author)
journal article 2005
document
Nikbakht, M. (author), Wells, G.N. (author)
The automated approximation of solutions to differential equations which involve discontinuities across evolving surfaces is addressed. Finite element technology has developed to the point where it is now possible to model evolving discontinuities independently of the underlying mesh, which is particularly useful in simulating failure of solids....
journal article 2009
document
Labeur, R.J. (author), Wells, G.N. (author)
A hybrid method for the incompressible Navier–Stokes equations is presented. The ethod inherits the attractive stabilizing mechanism of upwinded discontinuous Galerkin methods hen momentum advection becomes significant, equal-order interpolations can be used for the velocity nd pressure fields, and mass can be conserved locally. Using continuous...
journal article 2012
document
Pickering, M.D. (author), Horsburgh, K.J. (author), Blundell, J.R. (author), Hirschi, J.J.-M. (author), Nicholls, Robert J. (author), Verlaan, M. (author), Wells, N.C. (author)
Tides are a key component in coastal extreme water levels. Possible changes in the tides caused by mean sea-level rise (SLR) are therefore of importance in the analysis of coastal flooding, as well as many other applications. We investigate the effect of future SLR on the tides globally using a fully global forward tidal model: OTISmpi....
journal article 2017
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Fumasoli, Alexandra (author), Bürgmann, Helmut (author), Weissbrodt, D.G. (author), Wells, G.N. (author), Beck, Karin (author), Mohn, Joachim (author), Morgenroth, Eberhard (author), Udert, Kai M. (author)
Ammonia oxidation decreases the pH in wastewaters where alkalinity is limited relative to total ammonia. The activity of ammonia oxidizing bacteria (AOB), however, typically decreases with pH and often ceases completely in slightly acidic wastewaters. Nevertheless, nitrification at low pH has been reported in reactors treating human urine,...
journal article 2017
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Laureni, M. (author), Weissbrodt, D.G. (author), Villez, Kris (author), Robin, Orlane (author), de Jonge, Nadieh (author), Rosenthal, Alex (author), Wells, GN (author), Nielsen, Jeppe Lund (author), Morgenroth, Eberhard (author), Joss, Adriano (author)
The control of nitrite-oxidizing bacteria (NOB) challenges the implementation of partial nitritation and anammox (PN/A) processes under mainstream conditions. The aim of the present study was to understand how operating conditions impact microbial competition and the control of NOB in hybrid PN/A systems, where biofilm and flocs coexist. A...
journal article 2019
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