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- W2738133079 abstract "Most wind engineering problems deal with large bluff bodies that are located within the atmospheric boundary layer. For the cross section of large suspension bridges the relevant Reynolds number ranges from O(105) to O(108) with a typical turbulence intensity around 5-10% in the oncoming flow. In bridge aerodynamics, vortex methods are used extensively to calculate the aerodynamic forces and flow field around bridge cross sections due to its efficiency and inherent physical similarity, which is maintained even at large Reynolds numbers. So far the applied vortex methods have modelled the flow without employing an explicit model for unresolved turbulence scales. The hybrid vortex-in-cell (VIC) method offers a highly efficient particle-mesh algorithm that combines Lagrangian and Eulerian schemes to discretize different parts of the governing equation and thereby exploits the strength of each scheme. One of the benefits of the VIC method is its ability to efficiently solve transport equations. This is used in the present study to implement the transport based Spalart-Allmaras (SA) turbulence model [1] in the VIC method by an unsteady RANS approach. The two-dimensional VIC method, first presented in [2], uses a high order Poisson solver based on fast Fourier transforms subject to free space boundary conditions. By exploiting the linearity of the Poisson equation, high grid resolution is achieved using particle and mesh patches of different resolution. The final solution to the Poisson equation is given by the superposed solution of each patch subject to a free stream velocity U . Solid boundaries are implemented by a Brinkman penalization using an explicit split-step algorithm. The Spalart-Allmaras turbulence model is implemented by solving the eddy viscosity transport equation similarly to the vorticity equation by convecting the eddy viscosity along with the particles. Figure 1: The simulated flow around a square cylinder using the Spalart-Allmaras turbulence model with an inflow condition of the eddy viscosity. Left: vorticity field. Right: modelled eddy viscosity. -0.50 -0.25 0.00 0.25 0.50 0.75 1.00" @default.
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- W2738133079 date "2012-01-01" @default.
- W2738133079 modified "2023-09-26" @default.
- W2738133079 title "Implementation of the Spalart-Allmaras turbulence model in the two-dimensional vortex-in-cell method" @default.
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