Turbulent-like hemodynamics with prominent cycle-to-cycle flow variations have received increased attention as a potential stimulus for cardiovascular diseases. These turbulent conditions are typically evaluated in a statistical sense from single scalars extracted from ensemble-averaged tensors (such as the Reynolds stress tensor), limiting the amount of information that can be used for physical interpretations and quality assessments of numerical models. In this study, barycentric anisotropy invariant mapping was used to demonstrate an efficient and comprehensive approach to characterize turbulence-related tensor fields in patient-specific cardiovascular flows, obtained from scale-resolving large eddy simulations. These techniques were also used to analyze some common modeling compromises as well as MRI turbulence measurements through an idealized constriction. The proposed method found explicit sites of elevated turbulence anisotropy, including a broad but time-varying spectrum of characteristics over the flow deceleration phase, which was different for both the steady inflow and Reynolds-averaged Navier–Stokes modeling assumptions. Qualitatively, the MRI results showed overall expected post-stenotic turbulence characteristics, however, also with apparent regions of unrealizable or conceivably physically unrealistic conditions, including the highest turbulence intensity ranges. These findings suggest that more detailed studies of MRI-measured turbulence fields are needed, which hopefully can be assisted by more comprehensive evaluation tools such as the once described herein.

具有显着循环到循环流量变化的湍流样血流动力学作为心血管疾病的潜在刺激受到越来越多的关注。这些湍流条件通常是从集合平均张量（例如雷诺应力张量）中提取的单个标量以统计意义进行评估的，这限制了可用于数值模型的物理解释和质量评估的信息量。在这项研究中，重心各向异性不变映射用于展示一种有效且全面的方法来表征患者特定心血管流中与湍流相关的张量场，该方法是从尺度解析大涡流模拟中获得的。这些技术还用于通过理想化的收缩来分析一些常见的建模折衷以及 MRI 湍流测量。所提出的方法发现了湍流各向异性升高的明确位点，包括流动减速阶段的广泛但随时间变化的特征谱，这对于稳定流入和雷诺平均 Navier-Stokes 建模假设来说是不同的。定性地，MRI 结果显示了总体预期的狭窄后湍流特征，然而，也具有无法实现或可想象的物理不现实条件的明显区域，包括最高湍流强度范围。这些发现表明需要对 MRI 测量的湍流场进行更详细的研究，