Modeling of the flow around permeable surfaces

The paper presents the method of calculation the flow around a porous (permeable) surface by use of a set of bodies, modeling permeable part of the surface. A finite, relatively small number of elements, due to the computer processing capabilities, models the porous (permeable) surface. The geometric similarity of the shapes of surface elements and equal value of the permeability ratio provides the similarity between the aerodynamic surface properties in the mathematical model and the real surface. Comparison of calculation results with the experimental data shows a capability to reasonably predict the aerodynamic properties of the permeable surfaces. The computational feasibility in a large variation range of the permeability ratio is shown by the example of the flow calculation of torus with various geometric forms of section. The flow modeling possibility around complex configurations is demonstrated by the example of the flow calculations around permeable cone and cylinder. The set of programs for modeling two-dimensional plane and axisymmetric flows around the permeable surfaces is implemented.