温度分层海洋表面的波动特性

Wave characters on the temperature-stratified ocean surface

海洋中的温度/密度分层是一种普遍现象。该文基于N-S方程,结合Airy波浪理论和VOF两相流模型,数值模拟了分层海洋中的波动特性。通过与理论解的对比验证了数值模型的有效性。研究了波浪作用下的海面波动特征、温度/密度分层情况下波动的传播过程以及密度分层对波动抑制的影响。研究发现,在海面处、下层海水处,温度波动并不符合明显的正弦特性,存在着"削峰"现象,更接近于"方波"的特性,体现了由温度分层导致密度变化所引起的抑制效应。该文的结论对研究海洋表面热量交换、营养物质的输运、船舶航行和波浪的传播等具有借鉴意义。

Temperature/density stratification is the common phenomenon in the ocean. Based on N-S equations, Airy wave theory and VOF two-phase model, the wave characters in the stratified ocean are simulated numerically. The validity of the numerical model is validated by comparing with the theoretical value. The wave characters, propagation of the wave and the restraining to the wave of the stratification are analyzed. At the interface of the water stratification, the wave property is inclined to ＂square wave＂ instead of ＂ sine wave＂. This indicates the depression effect of the density stratification. The results in this paper can be helpful in studying the heat exchange of the ocean surface, transport of the nutrient substance and the wave＇s propagation.