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排序方式: 共有155条查询结果,搜索用时 31 毫秒
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Thibaut Lery CÉline Combet Gareth Murphy Luke O. C. Drury 《Astrophysics and Space Science》2005,298(1-2):375-378
As network performance has outpaced computational power and storage capacity, a new paradigm has evolved to enable the sharing
of geographically distributed resources. This paradigm is known as Grid computing and aims to offer access to distributed
resource irrespective of their physical location. Many national, European and international projects have been launched during
the last years trying to explore the Grid and to change the way we are doing our everyday work. In Ireland, we have started
the CosmoGrid project that is a collaborative project aimed to provide high performance super-computing environments. This
will help to address complex problems such as magnetohydrodynamic outflows and jets in order to model and numerically simulate
them. Indeed, the numerical modeling of plasma jets requires massive computations, due to the wide range of spatial-temporal
scales involved. We present here the first jet simulations and their corresponding models that could help to understand results
from laboratory experiments. 相似文献
45.
Sub-grid scale parameterisation of 2D hydrodynamic models of inundation in the urban area 总被引:1,自引:0,他引:1
This paper presents preliminary results from a study considering the parameterisation of coarse-grid 2D flood models to take
into account sub-grid scale flow patterns occurring in the urban area. A simulation of a severe flood in an urbanized coastal
floodplain is first run using a fine grid that can resolve the flow around and between buildings. Next, the same model is
run again using the same underlying topography, although stripped from any buildings, and a set of 7 values of the roughness
parameter (Manning’s n), all larger than (or equal to) the value used in the original run. A further set of simulations is carried out using a five-fold
increased grid cell size. It is found that while it may be possible to model the overall effects of the buildings using strongly
increased roughness parameter values, using a coarse grid otherwise has implications related to the loss of information about
the site topography that results in flood flow routes being incorrectly modelled. 相似文献
46.
Gareth S. Jones Jonathan M. Gregory Peter A. Stott Simon F. B. Tett Robert B. Thorpe 《Climate Dynamics》2005,25(7-8):725-738
Volcanic ‘super-eruptions’ have been suggested to have significantly influenced the Earth’s climate, perhaps causing glaciations
and impacting on the human population. Climatic changes following a hypothetical ‘super-eruption’ are simulated using a coupled
atmosphere ocean general circulation model, incorporating scaled volcanic stratospheric aerosols. Assumptions are made about
the stratospheric sulphate aerosol loading, size distribution, lifetime, chemical make up and spatial distribution. As this
study is concentrating on the physical climatological impacts over long timescales, microphysics and chemical interactive
processes are not simulated. Near-surface temperatures fall by as much as 10 K globally for a few months and a considerable
deviation from normal temperatures continues for several decades. A warming pattern is evident over northern land masses during
the winter due to increased longwave forcing and a positive AO mode. The overturning rate of the North Atlantic thermohaline
circulation doubles in intensity. Snow and ice increases in extent to a maximum coverage of 35% of the Earth. Despite these
and other impacts longer term climatic changes that could lead to a transition to a glaciation do not occur, for present day
boundary conditions and one possible plausible aerosol loading. 相似文献
47.
This paper presents the current progress of the River Level Monitoring using GPS Heighting (RiGHt) project. The aim of the
project is to develop an integrated system to allow the continuous monitoring of river heights using a buoy equipped with
Global Positioning System (GPS) and satellite communications and using Geographical Information System (GIS) techniques. ?
2000 John Wiley & Sons, Inc. 相似文献
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49.
Thomas M. Davison Fred J. Ciesla Gareth S. Collins Dirk Elbeshausen 《Meteoritics & planetary science》2014,49(12):2252-2265
Collisions between planetesimals in the early solar system were a common and fundamental process. Most collisions occurred at an oblique incidence angle, yet the influence of impact angle on heating in collisions is not fully understood. We have conducted a series of shock physics simulations to quantify oblique heating processes, and find that both impact angle and target curvature are important in quantifying the amount of heating in a collision. We find an expression to estimate the heating in an oblique collision compared to that in a vertical incidence collision. We have used this expression to quantify heating in the Rhealsilvia‐forming impact on Vesta, and find that there is slightly more heating in a 45° impact than in a vertical impact. Finally, we apply these results to Monte Carlo simulations of collisional processes in the early solar system, and determine the overall effect of impact obliquity from the range of impacts that occurred on a meteorite parent body. For those bodies that survived 100 Myr without disruption, it is not necessary to account for the natural variation in impact angle, as the amount of heating was well approximated by a fixed impact angle of 45°. However, for disruptive impacts, this natural variation in impact angle should be accounted for, as around a quarter of bodies were globally heated by at least 100 K in a variable‐angle model, an order of magnitude higher than under an assumption of a fixed angle of 45°. 相似文献
50.
Tamara J. Goldin Kai Wünnemann H. Jay Melosh Gareth S. Collins 《Meteoritics & planetary science》2006,41(12):1947-1958
Abstract— We present the first hydrocode simulations of the formation of the Sierra Madera structure (west Texas, USA), which was caused by an impact into a thick sedimentary target sequence. We modeled Sierra Madera using the iSALE hydrocode, and here we present two best‐fit models: 1) a crater with a rim (final crater) diameter of ?12 km, in agreement with previous authors' interpretations of the original structure, and 2) a crater ?16 km in diameter with increased postimpact erosion. Both models fit some of the geologic observational data, but discrepancies with estimates of peak shock pressure, extent of deformation, and stratigraphic displacement remain. This study suggests that Sierra Madera may be a larger crater than previously reported and illustrates some of the challenges in simulating impact deformation of sedimentary lithologies. As many terrestrial craters possess some amount of sedimentary rocks in the target sequence, numerical models of impacts into sedimentary targets are essential to our understanding of target rock deformation and the mechanics of crater formation. 相似文献