Numerical Study on Topographic Effects in Stably-Stratified Fluids : Case of a Steep Isolated-Hill

DOI HANDLE Web Site Open Access
  • UCHIDA Takanori
    Research Institute for Applied Mechanics Kyushu University : Associate Professor
  • OHYA Yuji
    Research Institute for Applied Mechanics Kyushu University : Professor

Bibliographic Information

Other Title
  • 安定成層流体中の地形効果に関する数値的研究 : 急峻な孤立峰の場合
  • アンテイ セイソウ リュウタイ チュウ ノ チケイ コウカ ニ カンスル スウチテキ ケンキュウ キュウシュン ナ コリツホウ ノ バアイ

Search this article

Abstract

Stably-stratified flows past a three-dimensional steep isolated-hill were investigated numerically by using a large-eddy simulation (LES) technique based on a finite-difference method (FDM). In order to simulate the flows around the hill with high accuracy, a generalized curvilinear collocated grid is employed. All the calculations were performed with the Froude number Fr(=U/Nh) in the range 0.1 ≦Fr≦ ∞, where U, N and h are the uniform approaching flow, the buoyancy frequency and the hill height, respectively. The Reynolds number Re(=Uh/ v) is set at 3000, where v is the coefficient of the kinematic viscosity. Attention is focused on the occurrence of local severe winds, which are induced the lee side of the hill. For Fr=l and 0.5, a strong wind area with a wind speed greater than U is clearly caused by the downslope flow in the lee wave motion.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top