标题： 人体鼻腔计算流体动力学中数值格式的重要性 显示英文标题

标题： Importance of the numerical schemes in the CFD of the human nose

摘要： 计算流体动力学中，从患者特定的计算机断层扫描（CT）图像开始研究人体鼻腔内的气流，是诊断和手术规划的重要工具。 然而，对主要建模假设影响的全面而系统的评估仍然缺乏。 在设计此类模拟时，选择离散化方案是一个常常被忽视但至关重要的决定，这是本文的主要研究内容。 我们使用一个比较框架来量化主要设计选择对结果的影响。 使用健康代表性成年患者的重建气道来建立计算研究，系统地测量这些影响。 发现数值方案的选择是最重要的方面，尽管所有变化的参数都会显著影响解。 对于生理上有意义的流量，观察到全局压力降的变化超过50%；局部上，速度差异可能变得非常显著。 我们的结果呼吁改进此类数值研究的描述标准，其中往往很少提及数值方案的精度等级。 显示英文摘要

摘要： Computational fluid dynamics of the air flow in the human nasal cavities, starting from patient-specific Computer Tomography (CT) scans, is an important tool for diagnostics and surgery planning. However, a complete and systematic assessment of the influence of the main modeling assumptions is still lacking. In designing such simulations, choosing the discretization scheme, which is the main subject of the present work, is an often overlooked decision of primary importance. We use a comparison framework to quantify the effects of the major design choices on the results. The reconstructed airways of a healthy, representative adult patient are used to set up a computational study where such effects are systematically measured. It is found that the choice of the numerical scheme is the most important aspect, although all varied parameters impact the solution noticeably. For a physiologically meaningful flow rate, changes of the global pressure drop up to more than 50\% are observed; locally, velocity differences can become extremely significant. Our results call for an improved standard in the description of this type of numerical studies, where way too often the order of accuracy of the numerical scheme is not mentioned.