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首页> 外文期刊>Journal of visualization >Characterization of a diffuser flow by time-resolved PIV
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Characterization of a diffuser flow by time-resolved PIV

机译：通过时间分辨PIV表征扩散器流量

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Computational fluid dynamics is extensively used in the design methodology of medical devices. However, for such applications, the predictive capabilities of CFD codes are highly dependent upon geometry, which most of the time is extremely complex, and flow conditions. The study concerns a ventricular assist device (VAD) where the exit flow, generated through a diffuser, is of particular importance for blood damage predictions. The difficulty to predict the flow lies in the fact that the Reynolds number range includes the transition Reynolds number of the separated diffuser flow as well as the critical Reynolds number of pipe flows. In order to choose the appropriate CFD methodology in terms of flow hypothesis and turbulence model, an experimental setup of the diffuser was built to run PIV velocity measurements and to analyze the flow pattern with the influence of Reynolds number. The flow is described with mean and variance values of the in-plane velocity components and time-resolved results are used to visualize the development of unsteady phenomena introduced in the diffuser separated region. An optimal filter is also used to remove noise in measured velocity vector fields.
机译：计算流体动力学被广泛应用于医疗设备的设计方法中。但是，对于此类应用，CFD代码的预测能力高度依赖于几何形状（大多数情况下极为复杂）以及流动条件。该研究涉及一种心室辅助设备（VAD），其中通过扩散器产生的出口流量对于血液损害的预测尤为重要。预测流量的困难在于，雷诺数范围包括分离的扩散器流的过渡雷诺数以及管道流量的临界雷诺数。为了根据流动假设和湍流模型选择适当的CFD方法，建立了扩散器的实验装置，以运行PIV速度测量并在雷诺数的影响下分析流动模式。用平面内速度分量的均值和方差值描述流，并使用时间分辨的结果来可视化引入扩散器分隔区域中的不稳定现象的发展。最佳滤波器还用于消除测得的速度矢量场中的噪声。

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