BASIC VALIDATION OF LES METHOD FOR PRACTICAL ANALYSIS OF OPEN-CHANNEL TURBULENT FLOWS
開水路乱流実用解析のためのLES法の基礎的検証

Nobuyuki HISASUE, Akihiko NAKAYAMA, Satoshi YOKOJIMA
2014 Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering)  
久末信幸 1 ・中山昭彦 2 ・横嶋哲 3 Nobuyuki HISASUE, Akihiko NAKAYAMA and Satoshi YOKOJIMA 1 正生員 博士(工学) 関西電力株式会社電力技術研究所(〒661-0974 尼崎市若王寺 3-11-20) Elements of a Large Eddy Simulation (LES) method are examined emphasizing application to practical real-scale open-channel flows. Though LES methods have been validated by developers as specific methods and models are proposed or applied, most of these validations are not intended for hydraulic applications. We validate a LES method for analyzing open-channel
more » ... g open-channel flows in real applications such as design of hydraulic structures. It is shown that proper treatment of wall boundary condition is necessary and a simple but practical wall stress model is sufficient to obtain accurate mean-flow and the instantaneous large-scale turbulence structure with moderate grid resolution. It is suggested that the turbulent stresses are determined more by shear-stress carrying large motions than by energy-dissipating small scale motions. Specific examples include very high Reynolds number flows in smooth and rough surface channels with three-dimensional mean flow and large changes with separation and recirculation.
doi:10.2208/jscejhe.70.i_841 fatcat:tq5o2puwc5bqzecniwbwmlffdu