Near-wall anisotropy under round and planar jet impingement

Abstract

Anisotropic invariant mapping (AIM) is used to explain the nature of turbulence in the near-wall region of impinging jets. AIM is plotted to gain an understanding of the turbulent stress tensor under round and planar jet impingement. For a fixed jet Reynolds number of 23,000, results of our computational studies (Large Eddy Simulations) show that round jets exhibit isotropic turbulence in the stagnation region that undergoes eddy contraction and stretching as it moves into the wall-jet region. In contrast, planar jets do not exhibit any isotropic turbulence and remain largely dominated by two-component turbulence.