替代多重放松时间格子 博尔茨曼方法模拟结合热传递的模拟方法
Yong Zhao1, Xinyue Liu2, Zhenyu Chen3
1Changsha University of Science and Technology, School of Mathematics and Statistics, Changsha 410114, Hunan, China.
Physical review. E
|June 19, 2025
概括
一个新的多重放松时间格子博尔兹曼 (LB) 方案准确地模拟了联合热传递. 这种LB方法为复杂的热应用提供了通用和准确的方法.
科学领域:
- 计算物理学的计算物理.
- 热力学是一种热力学.
- 流体动力学 流体动力学
背景情况:
- 对各种工程应用而言,精确模拟合热传递是至关重要的.
- 现有的方法经常面临着利略不变性和结合特定热容量效应的挑战.
研究的目的:
- 提出一个替代的多重放松时间格子博尔兹曼 (LB) 方案用于联合热传输.
- 通过正确推导能量控制方程和定义热边界条件来确保利略的不变性.
主要方法:
- 从热力学第一定律推导出控制能量方程.
- 修改了温度演变方程,以包括特定热容量.
- 将对流量项视为以瞬间空间计算的源项,避免有限差异方法.
- 通过使用基准问题和在随机多孔介质中模拟热传递来验证模型.
主要成果:
- 拟议的LB方案正确处理联热传递,确保利略不变.
- 数字模拟显示了令人满意的准确性和二次空间收.
- 该模型成功模拟了复杂的传热场景,包括多孔介质冷却.
结论:
- 开发的LB方案提供了一个强大的,准确的方法来模拟合热传递.
- 该模型的多功能性使其适用于各种复杂的热工程问题.
- 这种方法保留了LB方法的优势,同时增强了热模拟能力.
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
1.7K
10:52Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
13.0K
相关概念视频
01:20Maxwell-Boltzmann Distribution: Problem Solving
1.8K
Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
1.8K
01:20Mechanisms of Heat Transfer II
3.5K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.5K
01:14Mechanisms of Heat Transfer I
4.7K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.7K
01:14Mechanisms of Heat Transfer
584
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
584
01:28Atomic Nuclei: Types of Nuclear Relaxation
399
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
399
01:16Thermal Sigmatropic Reactions: Overview
2.2K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.2K