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31.
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The link-cell (LC) algorithm is widely used in discrete element method (DEM) simulation, in order to increase computational efficiency. The common way is to divide the entire computational domain into a series of square sub-cells. A huge index matrix, Ω, is required to store the information of particles located in each of these sub-cells. However, most of these sub-cells are always empty for some anomalistic computational domain, such as particulate flow in a pipeline. These empty sub-cells also consume the limited memory bandwidth and lower the computational power. In order to reduce the size of the index matrix, a body fitted link-cell (BFLC) algorithm is established to identify the neighbors quickly. Furthermore, a simplified algorithm for simulation of two dimensional particulate flow in curved pipelines is presented. Lastly, an example is presented to validate the BFLC algorithm. 相似文献
33.
Sergei V. Shirin 《Journal of Quantitative Spectroscopy & Radiative Transfer》2008,109(4):549-558
A line list for D2 16O isotopologue of water molecule was calculated in the region 0-16,000 cm−1 with energy levels up to J=30. Variational calculations are based on the semi-theoretical potential energy surface obtained by morphing ab initio potential using the experimental energy levels of D2 16O. For energy levels with J=0, 2, 5 and 10, the standard deviation of the fit is 0.023 cm−1. This line list should make an excellent starting point for spectroscopic modeling and analysis of D2O rovibrational spectra. 相似文献
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35.
This paper proves the following result. Assume is a triangle-free planar graph, is an independent set of . If is a list assignment of such that for each vertex and for each vertex , then is -colorable. 相似文献
36.
《Discrete Mathematics》2022,345(10):112999
Ryser proved that any two tournaments with the same score sequence are -equivalent while Beineke and Moon proved the -equivalence for any two bipartite tournaments with the same score lists. In this paper, we extend these results to orientations of G vertex-multiplications. We focus on two main areas, namely orientations with the same score list and with score-list parity. Our main tools are extensions of the refinement technique, directed difference graph and a reduction lemma. 相似文献
37.
In this paper, we present new structural results about the existence of a subgraph where the degrees of the vertices are pre-specified. Further, we use these results to prove a 16-edge-weighting version of a conjecture by Karoński, ?uczak and Thomason, an asymptotic 2-edge-weighting version of the same conjecture, and a version of Louigi's Conjecture. 相似文献
38.
Jan Hladký Daniel Kráal Jean‐Sébastien Sereni Michael Stiebitz 《Journal of Graph Theory》2008,59(3):229-238
The measurable list chromatic number of a graph G is the smallest number ξ such that if each vertex v of G is assigned a set L(v) of measure ξ in a fixed atomless measure space, then there exist sets such that each c(v) has measure one and for every pair of adjacent vertices v and v'. We provide a simpler proof of a measurable generalization of Hall's theorem due to Hilton and Johnson [J Graph Theory 54 (2007), 179–193] and show that the measurable list chromatic number of a finite graph G is equal to its fractional chromatic number. © 2008 Wiley Periodicals, Inc. J Graph Theory 59: 229–238, 2008 相似文献
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Gonnet P 《Journal of computational chemistry》2007,28(2):570-573
Cell lists are ubiquitous in molecular dynamics simulations--be it for the direct computation of short-range inter-atomic potentials, the short-range direct part of a long-range interaction or for the periodic construction of Verlet lists. The conventional approach to computing pairwise interactions using cell lists leads to a large number of unnecessary interparticle distance calculations. In this paper, an algorithm is presented which reduces the number of spurious distance calculations by first sorting the particles along the cell pair axis and then only interacting two particles if their distance along the axis is smaller than the cutoff distance of the interaction. This approach is shown to be more efficient than the conventional approach and similar approaches using smaller cells. 相似文献