Title: CLIP: A CUDA-Accelerated Lattice Boltzmann Framework for Interfacial Phenomena with Application to Liquid Jet Simulations Show Chinese title

Title: CLIP：一种用于界面现象的CUDA加速格子玻尔兹曼框架及其在液体射流模拟中的应用

Abstract: This work introduces CLIP, a CUDA-accelerated phase-field lattice Boltzmann framework for simulating immiscible two-phase flows with high density and viscosity ratios in both two- and three-dimensional domains. By leveraging GPU parallelism, the framework delivers substantial computational speedups, enabling large-scale simulations to be performed efficiently on standard desktop hardware without the need for high-performance computing clusters. It employs the Weighted Multi-Relaxation Time (WMRT) collision operator to enhance numerical stability and improve interface tracking under challenging multiphase conditions. The model is validated through a series of benchmark cases, including capillary wave dynamics, stationary drop tests, two-phase Poiseuille flow, shear-driven interface deformation, and Rayleigh-Taylor instability. It is further applied to simulate liquid jet breakup, capturing the transition from dripping to jetting regimes and identifying a critical Weber number of approximately 2.2. The results closely match experimental observations, offering detailed insights into breakup length, drop size distributions, and flow regime transitions. With its efficiency, accuracy, and scalability, the proposed framework serves as a powerful and accessible tool for investigating complex interfacial phenomena in multiphase flow physics. Show Chinese abstract

Abstract: 本文介绍了一个名为CLIP的CUDA加速相场格子玻尔兹曼框架，用于模拟在二维和三维域内具有高密度和粘度比的不混溶两相流。通过利用GPU并行性，该框架提供了显著的计算加速，使得在标准台式硬件上高效地进行大规模模拟成为可能，而无需高性能计算集群。它采用加权多松弛时间（WMRT）碰撞算子来增强数值稳定性，并在复杂的多相条件下改进界面追踪。该模型通过一系列基准案例进行了验证，包括毛细波动力学、静止液滴测试、两相泊谡流、剪切驱动界面变形以及瑞利-泰勒不稳定性。此外，该模型还被应用于模拟液体射流破裂，捕捉从滴落向喷射状态的转变，并确定临界韦伯数约为2.2。结果与实验观察高度吻合，提供了关于破裂长度、液滴尺寸分布和流动状态转换的详细见解。凭借其效率、准确性和可扩展性，所提出的框架为研究多相流物理学中的复杂界面现象提供了一个强大且易于访问的工具。