Boundary Condition for Simulation of Flow Over Porous Surfaces

A new boundary condition is presented for simulating the flow over passively porous surfaces. The model eliminates the need for construction of a grid within an underlying plenum, thereby simplifying the numerical modeling of passively porous flow control systems and reducing computation cost. Two structured-grid flow solvers, TLNS3D and CFL3D, and one unstructured solver, USM3Dns, are used to develop and evaluate the model. Results presented for the three codes on a slender forebody with circumferential porosity and on a wing with leading edge porosity demonstrate good agreement with experimental data and a remarkable ability to predict the aggregate aerodynamic effects of surface porosity with a simple boundary condition.