首页|An experimental investigation into density field mixing caused by ship motion in a two-layer density-stratified environment
An experimental investigation into density field mixing caused by ship motion in a two-layer density-stratified environment
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Elsevier
The mixing mechanisms of density-stratified fluids in natural and engineered aquatic systems play critical roles in ecological and engineering management. This study investigated the mixing processes of the density fields induced by ship motion in a two-layer density-stratified environment through laboratory experiments. A controlled experimental setup comprising a plexiglass flume and a ship model system was employed, integrating particle image velocimetry and planar laser-induced fluorescence techniques to synchronously measure velocity and density fields and analyze the temporal evolution of mixing under varying ship speeds. Three distinct mixing stages were observed: pre-ship entry, dominated by molecular diffusion across a stable interface; ship passage, compressing the light fluid layer while preserving stratification; and post-ship wake, characterized by turbulent entrainment and mixing driven by wake disturbances. Results showed that higher ship speeds amplified the turbulence intensity and density change rate, prolonging fluid entrainment and mixing duration. Quantitative analysis demonstrated a linear increase in the peak density change rates and turbulence intensity with ship speed, with extended decay times, due to enhanced wake energy. Furthermore, the turbulence decay followed an exponential power law, reflecting energy dissipation modulated by stratification. These findings provide valuable theoretical insights for optimizing vessel operations and mitigation measures in stratified waterways.
NETL
NSTL
Elsevier
