Large eddy simulation of vertical turbulent jets under JONSWAP waves |
| |
Authors: | Jun Lu Ling-Ling Wang Hong-Wu Tang Hui-Chao Dai |
| |
Institution: | [1]College of Water Conservancy and Hydro-power Engineering, Hohai University, 210098 Nanjing, China [2]Binhu Water Resource Bureaus, 214011 Wuxi, China |
| |
Abstract: | The effect of random waves on vertical plane turbulent jets is studied numerically and the mechanism behind the interaction
of the jet and waves is analyzed. The large eddy simulation method is used and the σ-coordinate system is adopted. Turbulence is modeled by a dynamic coherent eddy model. The σ-coordinate transformation is introduced to map the irregular physical domain with a wavy free surface and an uneven bottom
onto a regular computational domain. The fractional step method is used to solve the filtered Navier-Stokes equations. Results
presented include the distribution of velocity, the decay law of the mean velocity along the jet axis, self-similar characteristics
and volume flux per unit width. In particular, the role of coherent structures on the momentum transfer along the jet centerline
and the jet instantaneous characteristics in JONSWAP waves are a special focus of this research. The numerical results obtained
are of great theoretical importance in understanding the behavior of turbulent jets in random wave environments. |
| |
Keywords: | Large eddy simulation · Dynamic coherent eddy model · σ-coordinate · Turbulent jet · JONSWAP wave |
本文献已被 CNKI 维普 SpringerLink 等数据库收录! |