Meshless methods have attracted a lot of attention in flow simulations by eliminating the reliance on high-quality grids. This paper presents a novel meshless level set method that integrates a particle migration scheme with an RBF-based surface reconstruction technique to simulate free-surface flows. Utilizing a hybrid particle framework, this method leverages a semi-Lagrangian scheme for control particles (level set carriers) to prioritize robustness, and a fully Lagrangian approach for interface particles to maximize tracking precision. The RBF-FD method is applied to approximate the level set function and its gradient with interface particles, boundary nodes, and control particles. A regularization term is introduced to enhance the stability and smoothness of the RBF interpolation. This method is validated through a series of benchmarks, including Zalesak's disk rotation test and vortex deformation test, demonstrating reliable interface preservation and mass conservation. Further numerical tests on dam-break flows, water entry and sinking cylinder problems confirm its robustness and accuracy. The proposed method offers a flexible, accurate, and efficient alternative for meshless simulation of free-surface flows.
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