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Numerical Analyses for Low Reynolds Flow in a Ventricular Assist Device

机译：室内辅助装置中低雷诺流动的数值分析

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Scientific and technological advances in blood pump developments have been driven by their importance in cardiac patient treatments and in the expansion of life quality in assisted people. To improve and optimize the design and development, numerical tools were incorporated into the analyses of these mechanisms and have become indispensable in their advances. This study analyzes the flow behavior with low impeller Reynolds number, for which there is no consensus on the full development of turbulence in ventricular assist devices (VAD). For supporting analyses, computational numerical simulations were carried out in different scenarios with the same rotation speed. Two modeling approaches were applied: laminar flow and turbulent flow with the standard, RNG and realizable kappa - epsilon; the standard and SST kappa - omega models; and Spalart-Allmaras models. The results agree with the literature for VAD and the range for transient flows in stirred tanks with an impeller Reynolds number around 2800 for the tested scenarios. The turbulent models were compared, and it is suggested, based on the expected physical behavior, the use of kappa - epsilon RNG, standard and SST kappa - omega, and Spalart-Allmaras models to numerical analyses for low impeller Reynolds numbers according to the tested flow scenarios.
机译：血液泵开发的科技进步是由于心脏病患者治疗的重要性以及在辅助人士中的生活质量的扩大。为了改善和优化设计和开发，数值工具被纳入这些机制的分析中，并且在其进步方面变得不可或缺。本研究分析了低叶轮雷诺数的流动行为，对内，对心室辅助装置（VAD）的湍流完全发展没有共识。为了支持分析，在具有相同旋转速度的不同场景中进行计算数值模拟。采用了两种建模方法：具有标准，RNG和可实现的Kappa - epsilon的层流和湍流;标准和SST Kappa - Omega模型;和spalart-allmaras模型。结果同意VAD的文献，以及搅拌罐中的瞬态流量的范围，其中叶轮雷诺数约为2800，用于测试场景。比较湍流模型，建议根据预期的物理行为，使用Kappa - Epsilon RNG，标准和SST Kappa - Omega的使用，以及根据测试的低叶轮雷诺数的数值分析流程场景。

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