Aerodynamic Effects of Knitted Wire Meshes—CFD Simulations of the Flow Field and Influence on the Flow Separation of a Backward-Facing Ramp

Abstract

Passive flow control techniques are needed to reduce flow separation and enhance aerodynamic performance. In this work, the effect of a knitted wire mesh on the flow separation of a backward-facing ramp was numerically investigated for a Reynolds number of 3000. A grid independence study and a RANS turbulence model sensitivity analysis were conducted. The CFD simulations exhibited counter-rotating streamwise vortices emerging from the knitted wire mesh, and the reattachment length was significantly reduced. A variation of the knitted wire rows revealed a maximum reduction of the reattachment length of 25.7% for the case of four rows. A comparison with a different knitted wire mesh geometry yielded a decreased reattachment length reduction.

Several different ways to increase the accuracy of the numerical solution of the first order wave equation

“…As one of the most popular methods of numerical solution for partial differential equations, the finite-difference method (FDM) has been widely utilized in seismic modeling [15][16][17][18] and migration [19][20][21]. To improve the accuracy and stability of a FDM in numerical modeling, many methods have been developed, including difference schemes of variable grid [22,23], irregular grid [24,25], standard staggered grid [26,27], rotated staggered grid [28], variable time step [29], and implicit methods [30].…”