Lattice Boltzmann method for Oldroyd-B fluids
Lattice Boltzmann method for Oldroyd-B fluids
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DOI：
10.1016/j.compfluid.2015.08.004
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发表时间：
2016-01
影响因子：
2.8
通讯作者：
F. Osmanlic;C. Körner
中科院分区：
文献类型：
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作者：
F. Osmanlic;C. Körner
模拟牛顿流体中哑铃解的格点方法，由Onishi等人介绍。（2005）[1]，在现有的晶格玻尔兹曼框架内实现（Körner等人）。（2005））[2]。将该数值格式与稳态、起动简单剪切流和匀速运动下振荡速度场的解析解进行了比较。此外，一个新的传输模型的介绍和验证的振荡速度场下匀速运动。这两个测试是在良好的协议与分析解决方案。此外，一个4比1的平面收缩进行了模拟，以测试该方法是否能够再现复杂的粘弹性流动。在入口角处观察到一个唇涡。第二个基准是四辊设置。总体结果与以前的研究结果一致。
A lattice method for modeling a solution of dumbbells in a Newtonian fluid, introduced by Onishi et al. (2005) [1], is implemented within an existing lattice Boltzmann framework (Körner et al. (2005)) [2]. The numerical scheme is compared with the analytical solution of steady state and start up simple shear flow and an oscillating velocity field under uniform motion. Furthermore, a new transport model is introduced and validated for an oscillating velocity field under uniform motion. Both tests are in good agreement with the analytical solution. Additionally, a 4 to 1 planar contraction is simulated to test if the method is capable of reproducing complex viscoelastic flows. A lip vortex at the entrance corner is observed. A second benchmark is the four-roller setup. The overall results are in good agreement with previous studies.