Direct Numerical Simulation of a Fluid-Structure Interaction in a Turbulent Channel over a Finite-thickness Hyper-elastic Wall at Re_τ=180

This study is concerned with the simulation of a Re_τ=180 turbulent flow in a channel interacting with a nonlinear compliant wall via Direct Numerical Simulations. The simulation is performed using high-order spectral-element solver Nek5000 with explicit partitioned fluid-structure interaction (FSI) coupling based on Robin-Neumann boundary conditions via Arbitrary Lagrangian-Eulerian Method. The study is focused on analyzing surface drag, surface motion,  turbulent mixing, and turbulent statistics. Strong FSI interactions and active interface motions are observed when the stiffness of the solid material is relatively low. Turbulence statistics, such as mean stream-wise velocity, turbulent kinetic energy, Reynolds stress, and other statistical quantities, are altered dramatically by such compliant surface under selected material properties.