阶段场格子博尔兹曼模型具有可调整的散装粘度,用于准不可压缩的两相流
Jin Bao1, Long Ju2, Zhaoli Guo3
1Huazhong University of Science and Technology, State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Wuhan 430074, China.
Physical review. E
|November 18, 2025
概括
一个新的格子博尔兹曼模型增强了高雷诺兹数二相流的数值稳定性. 通过调整散装粘度,它可以抑制振荡,改善复杂流体动态的模拟.
科学领域:
- 计算流体动力学的流体动力学.
- 流体力学 流体力学 流体力学
- 阶段场理论 阶段场理论
背景情况:
- 在高雷诺兹数下模拟双相流动会给数值稳定性带来挑战.
- 现有的格子博尔兹曼模型经常在速度和压力场的振荡中扎.
- 几乎不可压缩的相场理论为建模这种流提供了一个框架.
研究的目的:
- 为高雷诺斯数的二相流提供一种新的格子博尔兹曼模型.
- 通过引入可调整的散装粘度来增强数值稳定性.
- 通过各种数值测试来验证模型的准确性和稳定性.
主要方法:
- 开发了一个使用两个合方程的格子博尔兹曼模型:一个用于卡恩-希利亚德方程,另一个用于准不可压缩的纳维埃-斯托克斯方程.
- 纳维尔-斯托克斯溶解器包含一个平衡分布函数,有一个自由参数来控制流的压缩性和调整散装粘度.
- 在格子博尔兹曼框架内使用单个放松时间碰撞操作员.
主要成果:
- 拟议的模型成功模拟了各种两相流动场景,包括剪切层,静态滴,雷利-泰勒不稳定性和上升的泡.
- 增强的批量粘度有效地抑制了速度和压力场中的高频振荡.
- 证明了在高雷诺兹数下模拟两相流量的数值稳定性.
结论:
- 开发的格子博尔茨曼模型为模拟高雷诺兹数二相流提供了准确而稳定的方法.
- 可调整的散装粘度是缓解这些模拟中的数值不稳定性的关键因素.
- 该模型显示了复杂流体动力学研究中应用的巨大潜力.
更多相关视频
10:36Author Spotlight: Optimization of Airflow Velocities in Battery Cooling Systems for Enhanced Thermal Performance and Reduced Energy Consumption
Published on: November 3, 2023
2.1K
10:58Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
Published on: July 22, 2025
582
相关概念视频
01:17Steady, Laminar Flow Between Parallel Plates
771
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.
771
01:22Couette Flow
890
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...
890
01:23Steady, Laminar Flow in Circular Tubes
999
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,...
999
01:30Typical Model Studies
607
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.
607
01:34The Fluid Mosaic Model
176.4K
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
176.4K
01:27Distribution of Molecular Speeds
5.3K
The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
5.3K