AN ADAPTIVE WAVELET COLLOCATION METHOD FOR FLUID-STRUCTURE INTERACTION AT HIGH REYNOLDS NUMBERS

Abstract

Two mathematical approaches are combined to calculate high Reynolds number in- compressible fluid-structure interaction: a wavelet method to dynamically adapt the computational grid to flow intermittency and obstacle motion, and Brinkman penalization to enforce solid bound- aries of arbitrary complexity. We also implement a wavelet-based multilevel solver for the Poisson problem for the pressure at each time step. The method is applied to two-dimensional flow around fixed and moving cylinders for Reynolds numbers in the range 3 × 101 ≤ Re ≤ 105 . The compression ratios of up to 1000 are achieved. For the first time it is demonstrated in actual dynamic simulations that the compression scales like Re1/2 over five orders of magnitude, while computational complexity scales like Re. This represents a significant improvement over the classical complexity estimate of Re9/4 for two-dimensional turbulence.