Abstract
Abrasive flow machining technology is a new type of precision machining technology. Due to its unique rheological properties, it can process any complex structure and size parts to meet the requirements that conventional machining cannot meet. Combined with the turbulent flow characteristics of the abrasive flow, the large eddy simulation numerical method is used to simulate the machining process of the abrasive flow. The influence of different sub-grid scale models on the simulation results is discussed. Taking curved tube as the research object, the static pressure, dynamic pressure and velocity of different sub-grid models are analyzed to find the best sub-grid scale model. Large eddy simulation method is used to simulate the complex flow channel parts, and the best sub-grid scale model suitable for complex flow channels is determined, which reveals the grinding and polishing rule of abrasive flow and provides academic support for future research. Therefore, it has frontier and important research value.
Highlights
The core of the abrasive flow machining technology is the abrasive
By using the knowledge of fluid mechanics, an appropriate turbulence model is selected, and the processing effect of abrasive particle flow is predicted by analyzing the flow field state and numerical value during the processing of abrasive particle flow
The Smagorinsky model [1] is a pure dissipative model, and the Algebraic Wall-Modeled LES [6] uses Reynolds average method to simulate the flow field in the inner region of the boundary layer, while the large eddy simulation method is used outside the near wall region
Summary
The core of the abrasive flow machining technology is the abrasive. The abrasive is mainly a solid-liquid two-phase flow composed of hard particles and liquid carriers. Under the influence of external conditions, the particles follow the flow of the carrier to rub and shear the machined surface, thereby removing the burrs and obtaining a desired uniform surface. The abrasive flow is a solid-liquid two-phase fluid. Its motion state is in the form of turbulent flow. By using the knowledge of fluid mechanics, an appropriate turbulence model is selected, and the processing effect of abrasive particle flow is predicted by analyzing the flow field state and numerical value during the processing of abrasive particle flow. OPTIMIZATION OF SUB-GRID SCALE MODEL FOR ABRASIVE FLOW MACHINING CURVED TUBE BASED ON LARGE EDDY SIMULATION.
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