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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。
Stratification of temperature / density in the ocean is a common phenomenon. Based on the N-S equation and the combination of Airy wave theory and VOF two-phase flow model, this paper numerically simulates the wave characteristics in stratified ocean. The validity of the numerical model is verified by comparison with theoretical solutions. The fluctuation characteristics of sea surface under wave action, the propagation process of fluctuation under temperature / density stratification and the influence of density stratification on fluctuation suppression are studied. The study found that at the sea surface and in the lower seawater, the temperature fluctuations do not accord with the obvious sine characteristics, and there exists the phenomenon of “clipping” which is closer to the “square wave” Suppression effect caused by density change. The conclusion of this paper can be used for reference to study the heat exchange on the surface of the ocean, the transport of nutrients, the navigation of ships and the propagation of waves.