Fluid-structure interaction of a viscoelastic compliant wall in turbulent channel flow*

Fluid-structure interaction of a viscoelastic wall in an incompressible turbulent channel is performed using Direct Numerical Simulation (DNS). The simulations include boundary condition effects by clamping the wall on the four sides. For this fluid-solid coupling problem, we cannot arbitrarily set the average fluid pressure, as it would lead to a non-physical wall deformation. Certain modifications to the sequential fixed-point iteration necessary to compute the average fluid pressure are discussed. Using the DNS wall-pressure fluctuations computed on a rigid wall at friction Reynolds numbers 180 and 400, we propose modifications to wall-pressure models to account for the low-Reynolds number effect. Furthermore, model-based predictions of plate excitation and radiated sound are compared to one-way coupled DNS-based predictions for an elastic plate.