排序方式： 共有9条查询结果，搜索用时 15 毫秒
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孔隙率与渗透率是多孔介质非常重要的属性参数,采用MRT LBM研究孔隙率损失与渗透率损失相关性以及同孔隙率异构孔隙对渗透率特性的影响。结果表明：当存在使孔隙率均匀变小的沉积、沉降或结焦等因素时,渗透率损失率是孔隙率损失率的2倍左右;同孔隙率异构多孔体中,渗透率有巨大差异;同孔隙率异构多孔体中最大孔喉最小孔喉比越大渗透率越小;同孔隙率多孔体中迂曲度越大渗透率越小。 相似文献
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Modified surface tension model for free surface flow with single-phase lattice Boltzmann method 总被引：1，自引：0，他引：1
A single-phase lattice Boltzmann model with modified surface tension is developed in this paper to solve the problem of high-density-ratio free surface flow.The computational efficiency and accuracy are both enhanced.The restriction to the relaxation factor （which needs to be smaller than 1） is circumvented by the new surface tension algebra,due to its rational physical nature compared with the treatment of Xing,Buther and Yang in their paper （Comp.Mater.Sci.,2007,39（2）：282-290）.The proposed stable surface tension scheme is applied to simulate the free deformation of a square droplet with surface tension effect and the process of a droplet impinging on a liquid film.The numerical solution for free deformation of a droplet agrees well with thermodynamic principles,and also achieves high accuracy in comparison with Xing,et al.＇s model.Three typical impinging modes are successfully obtained with the new scheme,and another particular mode found by Wang and Chen is also successfully simulated.The evolutions of liquid crown agree well with the power law related to time. 相似文献
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大学生身体成分特征与运动能力及体质健康的关系 总被引：22，自引：3，他引：19
18～ 2 3岁男、女大学生随年龄、体重的增长体脂缓慢增长 ,而去脂体重即瘦体重 (LBM)却呈下降趋势 ;18～ 2 3岁各年龄组大学生中 ,男生 18、19岁年龄组的无氧工作能力及 18岁年龄组的有氧工作能力明显好于其他各年龄组 (P <0 .0 5) ;女生 18、19岁年龄组的无氧及有氧工作能力均明显好于其他各年龄组 (P <0 .0 1) ;18～ 2 3岁各年龄组男、女大学生中 ,体脂高的学生的坐位体前屈、肺活量体重指数、立定跳远、10 0 0m跑 (男子 )及 80 0m跑 (女子 )、握力体重指数等 5项体质指标与体脂正常学生比较 ,有显著或非常显著差异 (P<0 .0 5或P <0 .0 1)。建议采取适当手段对大学生特别是体脂高的学生进行必要的体质健康干预 ,以增强其体质健康水平 相似文献
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采用近几年发展起来的一种新方法——格子波尔兹曼方法(Lattice Boltzmann Method,LBM),对井下热流进行了仿真模拟,从而得到了热流流动的规律。建立了LBM模型,对结果进行分析,并得出仿真效果。 相似文献
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大学生身体成分特征与运动能力及体质健康关系的研究 总被引：12，自引：1，他引：11
赵燕 《沈阳体育学院学报》2004,23(3):437-439
为探讨现阶段我国大学生身体成分特征与运动能力及体质健康的关系,采用实验研究法,查阅文献资料法,数理统计法等。结果表明,18～23岁男、女大学生随年龄、体重的增长体脂缓慢增长,而去脂体重即瘦体重(LBM)却呈下降趋势。18～23岁各年龄组大学生中,男子18、19岁年龄组的无氧工作能力及18岁年龄组的有氧工作能力明显好于其他各年龄组(P<0 05);女子18、19岁年龄组的无氧及有氧工作能力均明显好于其他各年龄组(P<0 01)。18～23岁各年龄组男、女大学生中,体脂高学生的坐位体前屈、肺活量体重指数、立定跳远、1000m跑(男子)及800m跑(女子)、握力体重指数等5项体质指标与体脂正常学生比较,有显著或非常显著差异(P<0 05或P<0 01)。建议采取适当手段对大学生特别是体脂高的学生进行必要的体质健康干预,以增强其体质健康水平。 相似文献
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Simulation of two-phase flows of a droplet impacting on a liquid film with an improved lattice Boltzmann model 总被引：1，自引：0，他引：1
Based on the lattice Boltzmann method (LBM), an improved pseudo-potential model, combined with a method of adding force term,
is used to simulate the two-phase flows caused by a liquid droplet impacting on a liquid film. In this model, the different
phases are treated as one fluid, and the interfaces between the vapor and liquid phases can be obtained by density value of
the fluid. This variant of the LBM allows one to obtain the densities of vapor and liquid with high accuracy. The model is
validated by an example of phase separation. The early stage of the impact of droplet on liquid film is simulated, and the
results are qualitatively consistent with physical phenomena. 相似文献
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Efficient communication is important to every parallel algorithm. A parallel communication optimization is introduced into
lattice Boltzmann method (LBM). It relies on a simplified communication strategy which is implemented by least square method.
After testing the improved algorithm on parallel platform, the experimental results show that compared with normal parallel
lattice Boltzmann algorithm, it provides better stability, higher performance while maintaining the same accuracy. 相似文献
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A finite difference lattice Boltzmann method of second-order accuracy in time is developed based on non-oscillatory scheme with no-free-parameter dissipation (NND) difference scheme in this paper. The NND lattice Boltzmann method is used to simulate high-speed flows by constructing a new equilibrium distribution function of the lattice Boltzmann method.Compared with a variation of lattice Boltzmann method developed by Qu, et al., the present method can capture shock waves and handle oscillations of high velocity flows accurately in larger time steps and in shorter computing time. Numerical results indicate the correctness and capability of simulating shock wave interactions of the NND lattice Boltzmann method. 相似文献
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