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Human induced flow field and resultant particle resuspension and transport during gait cycle

机译：步态周期中人为引起的流场以及由此产生的颗粒重悬和运输

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Particle resuspension from flooring is believed to be an important source of paniculate matter (PM) in the indoor environment. It is hypothesized that the high speed airflow generated between the flooring and the foot during the gait cycle is the main cause of particle resuspension. The simulation results show that particles are detached from the substrate during the downward motion of the foot. Furthermore, during the upward motion of the foot, additional particles may also be resuspended because of the suction flow generated by lifting the foot. These resuspended particles are then dispersed in the room by the airflow turbulence. In this study a combined experimental and computational studies were performed to shed light on the mechanisms of particle resuspension from flooring during the gait cycle. A mechanical foot experimental setup which mimics the human walking was developed and used to measure the rate of resuspension. In addition, to investigate the airflow field during walking, a three dimensional numerical model of a moving shoe during the gait cycle was generated using the ANSYS-FLUENT™ CFD package. A RANS approach with the RNG k-epsilon turbulence model was used for simulating the unsteady airflow field around and under the shoe. To include the shoe motion in the analysis, a user defined function (UDF) was developed and the dynamic mesh technique was used. A resuspension model was applied for the resuspension of pre-deposited particles from the flooring. The predicted particle resuspension were compared with the corresponding experimental results and good agreement was found.
机译：地板上的颗粒重悬浮被认为是室内环境中颗粒物（PM）的重要来源。假设在步态周期中在地板和脚之间产生的高速气流是颗粒重新悬浮的主要原因。仿真结果表明，在脚的向下运动过程中，粒子从基材上脱落。此外，在脚的向上运动过程中，由于抬起脚而产生的抽吸流也可能使其他颗粒重新悬浮。然后，这些重新悬浮的颗粒由于气流的湍流而散布在室内。在这项研究中，进行了组合的实验和计算研究，以阐明步态周期中地板重悬颗粒的机制。开发了模仿人类步行的机械脚实验装置，并用于测量重悬速度。另外，为了研究步行过程中的气流场，使用ANSYS-FLUENT™CFD软件包生成了一个步行鞋在步态周期中的三维数值模型。使用带有RNGk-ε湍流模型的RANS方法来模拟鞋子周围和下方的不稳定气流场。为了在分析中包括鞋的运动，开发了用户定义的函数（UDF），并使用了动态网格技术。将重悬模型用于从地板重悬预沉积的颗粒。将预测的颗粒重悬与相应的实验结果进行了比较，发现了很好的一致性。

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