1,731,261 research outputs found
Sound radiation from a generic bypass duct with bifurcations
No full textThe influence of bifurcations in an aero-engine bypass duct on noise radiation was investigated through high-order accurate three-dimensional numerical simulations. The physical process was described by a set of acoustic perturbation equations (APE), with a background mean flow. Four bifurcation arrangements, with an airfoil cross-section, were regularly placed in circumferential direction. Results of the simulations were compared with those of a clean duct case. A circumferential mode of m=12 with radial mode of n=1 and multi-n modes at a source frequency of 1547 Hz were set as acoustic inputs. Acoustic modes
interfered with the bifurcations resulting in a doubled circumferential mode pattern in the near field acoustic pressure distribution and slightly stronger sound
pressure level behind the bifurcations. Far field noise computations indicated 3.2 dB and 2.0 dB sound pressure level increases for radial mode of n=1 and multi-n
modes respectively. The bifurcations did not alter the radiation angle. A comparison was also made between APE and linearlised Euler equations (LEE). Results showed that the APE simulation produced almost identical far field sound
prediction to the LEE, with a small difference (< 0.8dB) at the main radiation peak angle
Stochastic simulation of non-stationary continuous multifractal time series
No full textIntermittency is an ubiquitous property of fully developed turbulence, for Eulerian and Lagrangian fields, and for velocity, passive and active scalars. Intermittency corresponds to multi-scale high fluctuations, with some underlying long-range correlations. Such property is usually characterized using scaling approaches, verified using experimental or numerical data. However there are only few studies devoted to the generation of continuous stochastic processes having non-stationary multifractal properties, able to mimic Eulerian or Lagrangian velocity or passive scalar time series. Here we review recent works on this topic, and we provide stochastic simulations in order to verify the theoretical predictions. In the lognormal framework we provide a plane expressing the scale invariant properties of these simulations
Automaton-Based Load Balancing Simulation in a Workstation Cluster
No full textHofestädt R, Huang X. Automaton-Based Load Balancing Simulation in a Workstation Cluster. In: Proceedings of APPT '95. Publishing House of Electronics Industry; 1995: 344-347
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dataset for the manuscript ''Potential influence of roadbed frost loading on water main failure''
No full textThis dataset includes input data for the thermal-hydraulic-mechanic model used in the manuscript entitled ''Potential influence of roadbed frost loading on water main failure'' by Huang, X., Rudolph, D., and Glass, B
A coupled thermal-hydraulic-mechanical approach to modeling roadbed frost loading on water main failure
No full textThis dataset includes input data for the thermal-hydraulic-mechanic model used in the manuscript entitled ''A coupled thermal-hydraulic-mechanical approach to modeling roadbed frost loading on water main failure'' by Huang, X., Rudolph, D., and Glass, B
Dataset for the manuscript "A coupled thermal-hydraulic-mechanical approach to modeling roadbed frost loading on water main failure"
No full textThis dataset includes input data for the thermal-hydraulic-mechanic model used in the manuscript entitled ''A coupled thermal-hydraulic-mechanical approach to modeling roadbed frost loading on water main failure'' by Huang, X., Rudolph, D., and Glass, B
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