Bluff-body simulation by SPH method with relatively high Reynolds number in laminar flow regime
Résumé
In this work, we present solutions for flow over an airfoil and square obstacle using Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) method. For the solution of these two problems, we present an improved WCSPH algorithm that can handle complex geometries with the usage of multiple tangent solid boundary method, and eliminate particle clustering induced instabilities with the implementation of particle fracture repair procedure as well as the corrected SPH discretization scheme. We have shown that the improved WCSPH method can be effectively used for flow simulations over bluff-bodies with Reynolds numbers as high as 1400, which is not achievable with standard WCSPH formulations. Our simulation results are validated with a Finite Element mesh-dependent Method (FEM), and excellent agreements among the results were observed. We illustrated that the improved WCSPH method is able to capture the complex physics of bluff-body flows naturally such as flow separation, detachment of separated flow, wake formation at the trailing edge, and vortex shedding without any extra effort to increase the particle resolution in some specific areas of interest. Copyright © 2010 by ASME.
Mots clés
Bluff body
Bluff body flows
Bluff-bodies
Complex geometries
Discretization scheme
Finite Element
High Reynolds number
Laminar flow regimes
Particle clustering
Particle fracture
Separated flows
Simulation result
Smoothed particle hydrodynamics
Solid boundaries
Specific areas
SPH methods
Trailing edges
Wake formation
Acoustic noise
Airfoils
Finite element method
Fluid structure interaction
Fluids
Laminar flow
Reynolds number
Vibrations (mechanical)
Wakes
Flow simulation