低马赫数下微超临界范德华流体的湍流混合

超临界流体中的微观尺度物理与宏观尺度对流传热

Microscale physics and macroscale convective heat transfer in supercritical fluids

本文从微观物性与宏观输运两个尺度综述超临界流体的流动与传热特性，重点讨论拟沸腾、无表面张力界面、传热恶化与再层流化的关联，并总结湍流建模和机器学习方法的最新进展。

超临界流体涡柱在拟沸腾线附近的动力学

Dynamics of a vortex column of supercritical fluid across the pseudo-boiling line

通过低马赫数数值模拟，研究超临界CO₂涡柱在拟沸腾线附近的热分层演化，发现粘性效应主导涡量变化，并识别出三种额外粘性机制，其中涡旋与粘性/密度梯度相互作用可产生反向涡量。

超临界流体平板边界层中K型转捩的直接数值模拟

Direct Numerical Simulations of K-type transition in a flat-plate boundary layer with supercritical fluids

本文通过直接数值模拟研究超临界流体平板边界层的K型转捩，发现亚临界和跨临界温度剖面下转捩均被延迟，且跨临界条件下壁面超伪沸腾温度会诱发额外发卡涡与近壁条纹结构。

超临界压力流体非绝热边界层中的瞬态增长

Transient growth in diabatic boundary layers with fluids at supercritical pressure

本文研究超临界压力流体边界层中跨越 Widom 线的温度剖面对非模态扰动增长的影响，发现跨临界状态下 Orr 机制导致短距离内强烈次优增长，且非模态 N-factor 与理想气体逆压梯度情形相似，加热跨越 Widom 线时最优增长可促进转捩。

Direct Numerical Simulation of high Prandtl number fluids and supercritical carbon dioxide canonical flows using the spectral element method

The design of advanced nuclear reactors (Gen IV) involves an array of challenging fluid-flow issues that affect safety and performance. Currently, these problems are addressed in an ad-hoc manner at varying scales which are time-consuming and expensive. The creation of a high-resolution heat transfer numerical database has the potential to help develop to accurate and inexpensively reduced resolution heat transfer models. Such models can help address industrial-driven issues associated with the heat transfer behavior of advanced reactors. The models can be developed using the multiscale hierar…

Direct numerical simulation of high-pressure mixing in turbulent jets

Combustion in automotive and aerospace applications employing diesel, gas turbine and liquid rocket engines is preceded by injection and mixing of fuel and oxidizer at high pressures, often exceeding mixture critical values. Experimental observations indicate that the jets injected at supercritical pressures exhibit significantly different dynamics than the jets at subcritical conditions, owing to the lack of distinct liquid and gas phases in supercritical state. As a result, the averaged flow quantities such as the potential core length, jet spatial growth rate and velocity decay profiles dif…

Liquid-jet instability at high pressures with real-fluid interface thermodynamics

The injection of liquid fuel at supercritical pressures is a relevant topic in combustion, but usually overlooked. In the past, the wrong assumption whereby the liquid experiments a fast transition to a supercritical state was made, thus neglecting any role of two-phase interface dynamics in the early stages of the atomization process. However, recent studies have shown that local thermodynamic phase equilibrium and mixing between the involved species allow the coexistence of both phases in this pressure range. In this work, a Volume-of-Fluid method adapted to variable-density real fluids is u…

快速旋转可压缩对流中隔音方法的有效性：边缘稳定性与Turbulence

Validity of Sound-Proof Approaches in Rapidly-Rotating Compressible Convection: Marginal Stability vs. Turbulence

滞弹性近似的有效性最近在低普朗特数流体中的快速旋转可压缩对流区域中受到质疑（Calkins等人，2015）。鉴于广泛的使用和高计算效率的隔音方法在这个天体物理学相关的制度，本文澄清了安全应用的条件。另一种伪不可压缩近似的潜力进行了研究，这在相反的滞弹性近似是从来没有预锻打破预测的边缘稳定点。然而，它的准确性，降低接近的参数对应的滞弹性方法，这是发生时，该域的声音穿越时间超过旋转时间尺度，即旋转马赫数大于1。关于超临界的情况下，这是自然的特点是较小的旋转马赫数，我们发现，滞弹性近似不显示非物理行为。随着瑞利数的增加，线性化滞弹性方程计算的增长率收敛于相应的完全可压缩值。同样，我们的完全非线性湍流模拟，与我们的完全可压缩和滞弹性模型，并在一个高度超临界，旋转，可压缩，低普朗特数制度进行了良好的协议。然而，该非线性测试示例仅针对0.14的中等低对流Rossby数。

关于低马赫数下可压缩气体流动力学机制的分子动力学假说

A molecular-kinetic hypothesis on the mechanics of compressible gas flow at low Mach numbers

本文从分子动理论角度，通过在BBGKY层级的配对相关函数中引入与气体宏观压缩率匹配的修正，解释了低马赫数下可压缩流动的压力平衡行为，并揭示了由此产生的第二粘度如何控制湍流不稳定性及设定Reynolds数临界值。