Computation of the Flow Over a Sphere at Re = 3700: A Comparison of Uniform and Turbulent Inflow Conditions
Computation of the Flow Over a Sphere at Re = 3700: A Comparison of Uniform and Turbulent Inflow Conditions
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Re = 3700 时球体上的流动计算：均匀和湍流流入条件的比较
DOI：
10.1115/1.4028754
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Sarkar
中科院分区：
文献类型：
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作者：
Y. Bazilevs;Jinhui Yan;M. Stadler;S. Sarkar
采用基于有限元法（FEM）的残差变分多尺度（RBVMS）公式，对雷诺数Re 1/4 3700时绕球流动进行了高分辨率计算。均匀和湍流入流条件被认为是与均匀流的情况下，对以前的直接数值模拟（DNS）的研究进行了验证。我们发现，作为一个结果，增加自由流湍流的中等强度，球体上的阻力增加，回流气泡的长度显着减少，近尾流湍流是显着更有活力的情况下，均匀的流入。在均匀流入的情况下，我们发现，该解决方案具有低的时间频率模式，这需要长时间的模拟，以获得高保真的统计平均值。使球体经受湍流流入，从解决方案中去除低频模式，并使较短时间的模拟能够实现收敛的流量统计。[DOI电话：10.1115/1.4028754]
A highly resolved computation of the flow past a sphere at Reynolds number Re1⁄4 3700 using a finite element method (FEM)-based residual-based variational multiscale (RBVMS) formulation is performed. Both uniform and turbulent inflow conditions are considered with the uniform flow case validated against a previous direct numerical simulation (DNS) study. We find that, as a result of adding free-stream turbulence of moderate intensity, the drag force on the sphere is increased, the length of the recirculation bubble is reduced dramatically, and the near-wake turbulence is significantly more energetic than in case of uniform inflow. In the case of uniform inflow, we find that the solution exhibits low temporal frequency modes, which necessitate long-time simulations to obtain high-fidelity statistical averages. Subjecting the sphere to turbulent inflow removes the low-frequency modes from the solution and enables shorter-time simulations to achieve converged flow statistics. [DOI: 10.1115/1.4028754]