Numerically modelling blockage effects on the flow between flat plates
Numerically modelling blockage effects on the flow between flat plates
复制标题
对平板间流动的阻塞效应进行数值模拟
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
M. Thompson
中科院分区：
文献类型：
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作者：
M. Griffith;K. Hourigan;M. Thompson
结果报告为两个板之间的层流的各种半圆形堵塞的效果的二维数值调查，雷诺数在50和3000之间，堵塞比范围从0.05到0.9。这项研究的目的是提供一个基本的了解阻塞效应的动脉收缩，或狭窄。阻塞比为0.5的结果与以前的工作相比，有利的流动后向台阶。绘制了雷诺数和阻塞比的二维参数空间。分析表明，三维流动的开始很可能与先前建立的向后台阶流动密切匹配。流量现象与堵塞率以上和以下的习惯半堵塞的总结，包括小于预期的流动分离长度较低的堵塞，和涡流脱落和不寻常的结构内的回流区较高的堵塞。
Results are reported for a two-dimensional numerical investigation of the effect of various semi-circular blockages on the laminar flow between two plates, for Reynolds number between 50 and 3000, and blockage ratio ranging from 0.05 to 0.9. The study is undertaken with the intention of providing a fundamental understanding of blockage effects in arterial constrictions, or stenoses. The results with blockage ratio of 0.5 compare favourably with previous work on the flow over a backwardfacing step. The two-dimensional parameter space for Reynolds number and blockage ratio is also mapped out. The analysis suggests that the onset of three-dimensionality of the flow is likely to be closely matched with that previously established for backward-facing step flow. Flow phenomena associated with blockage ratios above and below the customary half-blockage are summarised, including smaller-than-expected flow separation lengths for lower blockages, and vortex shedding and unusual structures within the recirculation zones for higher blockages.