实验验证大型模拟作为雷诺兹-平均纳维尔-斯托克斯流量建模在磁悬浮血中的基准
Jonas Abeken1, Utku Gülan2, Kai von Petersdorff-Campen3
1Interface Group, Department of Physiology, University of Zurich, Zurich, Switzerland.
Annals of biomedical engineering
|December 9, 2025
概括
大模拟 (LES) 准确验证了雷诺兹-平均纳维埃-斯托克斯 (RANS) 模型的血液流量. LES提供了可靠的基准,减少了在计算流体动力学 (CFD) 中进行广泛实验验证的需要.
科学领域:
- 计算流体动力学 (CFD) 是一种计算流体动力学.
- 生物医学工程 生物医学工程
- 血液动力学 血液动力学
背景情况:
- 精确的血建模对于设备开发至关重要.
- 雷诺兹-平均纳维尔-斯托克斯 (RANS) 模型被广泛使用,但需要验证.
- 大模拟 (LES) 为高保真度模拟提供了一个潜在的替代方案.
研究的目的:
- 评估大型模拟 (LES) 作为验证雷诺兹-平均纳维尔-斯托克斯 (RANS) 模型的基准. 在CentriMag离心血中.
- 将LES和RANS速度场预测与粒子图像速度测量 (PIV) 数据进行比较.
- 量化非旋转螺旋的运动,并评估其对流动力学的影响.
主要方法:
- 在光学可访问的复制品上进行粒子图像速度测量 (PIV).
- 比较了PIV的相位平均速度场与LES和三个不稳定的RANS模型的计算流体动力学 (CFD) 预测.
- 使用定制光学追踪器量化了三维螺旋运动,并将其纳入模拟中.
主要成果:
- 莱斯的预测显示出与PIV数据的良好一致 (约. 3%的RMS速度误差).
- RANS模型显示出更大的局部偏差,特别是在出口地区.
- 量化的非旋转螺旋运动对整体流量场的影响微不足道.
结论:
- 在血模拟中,LES是验证RANS模型的可靠基准.
- 从volute到outlet的过渡仍然是RANS建模的一个敏感区域.
- 理想化的旋转机运动适用于类似的磁悬浮装置的CFD建模.
关键词:
计算流体动力学的流体动力学.没有了,没有了,没有了.马格莱夫 (MagLev) 是一个非常重要的法律法规.在 PIVIV 中.在RANS RANS中使用.速度测量仪使用速度测量仪.腹腔室辅助器件设备可以帮助.更多相关视频
11:00Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
Published on: July 19, 2016
11.9K
07:30In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling
Published on: November 3, 2015
10.0K
相关概念视频
Typical Model Studies
603
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
603
Navier–Stokes Equations
2.0K
For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...
2.0K
Steady, Laminar Flow Between Parallel Plates
755
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
755
Steady, Laminar Flow in Circular Tubes
988
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
988
Laminar and Turbulent Flow
10.5K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
10.5K
Couette Flow
873
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
873
