NUMERICAL STUDY OF FLOW STRUCTURES WITHIN DIFFERENT CAVITIES USING LARGE EDDY SIMULATION

Abstract

Large eddy simulation using a classic Smagorinsky sub-grid scale is applied for predicting the vortical flow structures within cavities. Here, flow within three different cavities such as rectangular, semi-circular, and triangular shapes are studied in order to examine the shape effects on the flow behavior. The ratio of cavity length per cavity depth is L/D=2.0 for all cavity shapes. On the other hand, simulations are carried out at three different Reynolds numbers such as 103, 104, and 105 in order to understand the effects of Reynolds number on the wake structures within cavities. It is found that flow structures change as a function of Reynolds number and geometry of cavities. In addition, numerical predictions revealed that the rectangular cavity imposes a higher drag to fluid flow at Re=103 and 104 in comparison to semi-circular and triangular cavities. A pressure jump or kinetic energy reduction is realized for semi-circular cavity at Re=105. The present numerical results are in good agreement with previous data available in the literature

Keywords

• Cavity,Finite Volume Method,Large Eddy Simulation,Turbulence

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