Searched for:
(1 - 19 of 19)
document
Laureni, M. (author), Weissbrodt, D.G. (author), Villez, Kris (author), Robin, Orlane (author), de Jonge, Nadieh (author), Rosenthal, Alex (author), Wells, George (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
document
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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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
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
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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
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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
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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
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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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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
Wells, G.N. (author)
doctoral thesis 2001
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
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Walsh, K.M. (author), Wells, N.A.J. (author)
other 1990
document
Brown, D.K. (author), Eng, C. (author), Wells, G. (author)
report 1986
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Wells, E.W. (author)
A number of flights have been made over set tracks and heights to measure clear air turbulence in the vicinity of the Flinders Ranges in South Australia. Details of the meteorological observations and flight paths, and measurements of wind, temperature and turbulence obtained from the aircraft instrumentation are presented. Wind and temperature...
report 1966
document
Wells, D.R. (author)
In this dissertation some characteristics of the horizontal water velocity for single, multiple, and random gravity wave trains are studied. This work consists of two parts, an analogue study and hydraulic measurements. An important aspect in this work is to suggest the horizontal water velocity asymmetry as a criterion for sand movement by...
doctoral thesis 1964
document
Wells, A. (author), Kennett, R.H. (author)
report 1964
document
Wells, A.A. (author)
This note describes investigations into the suitability of the MAZDA XE/D/27 xenon discharge lamp as a background source for temperature measurements on a plasma jet by the visual line reversal method. Brightness temperatures of the xenon discharge were measured at wavelength intervals of 100 Å throughout the visible spectrum. The...
report 1962
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Wells, E.W. (author)
A number of flights have been made at low altitude over three routes in the U.K. The routes were in Sussex, East Anglia and Wales. Measurements made with a counting accelerometer have been analysed to investigate the effect of variation in terrain and meteorologioal conditions on the intensity of turbulence. A comparison has also been made...
report 1962
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Aspden, J.A.T. (author), Wainer, I.J. (author), Wells, D.R. (author), Zwamborn, J.A. (author)
Tests have been done in a laboratory flume, to evaluate the influence of vertical rods of 3 mm dia on the hydraulic and sedimentological characteristics of the flow. The first two tests have been done with some 10 cm waterdepth. In both tests the s ame flow rate and sediment transport was used, the only difference between the tests being the...
report 1962
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