New SFB 1313 publication, published in Transport in Porous Media:
- Xu Chu (SFB 1313 research project A02)
- Wenkang Wang (SFB 1313 research project A02)
- Guang Yang (SFB 1313 research project A02)
- Alexandros Terzis (Technion – Israel Institute of Technology)
- Rainer Helmig (SFB 1313 spokesman, research projects A02 and C02)
- Bernhard Weigand (SFB 1313 research project A02)
Turbulence transportation across permeable interfaces is investigated using direct numerical simulation, and the connection between the turbulent surface flow and the pore flow is explored. The porous media domain is constructed with an in-line arranged circular cylinder array. The effects of Reynolds number and porosity are also investigated by comparing cases with two Reynolds numbers (Re≈3000,6000) and two porosities (φ=0.5,0.8). It was found that the change of porosity leads to the variation of flow motions near the interface region, which further affect turbulence transportation below the interface. The turbulent kinetic energy (TKE) budget shows that turbulent diffusion and pressure transportation work as energy sink and source alternatively, which suggests a possible route for turbulence transferring into porous region. Further analysis on the spectral TKE budget reveals the role of modes of different wavelengths. A major finding is that mean convection not only affects the distribution of TKE in spatial space, but also in scale space. The permeability of the wall also have an major impact on the occurrence ratio between blow and suction events as well as their corresponding flow structures, which can be related to the change of the Kármán constant of the mean velocity profile.