Analysis of a simplification strategy in a nonhydrostatic model for surface and internal wave problems

作     者：Jinghua Zhang Wensheng Jiang Xueqing Zhang Jinghua Zhang;Wensheng Jiang;Xueqing Zhang

作者机构：Key Laboratory of Marine Environment and Ecology of Ministry of EducationOcean University of ChinaQingdao266100China Tianjin Research Institute for Water Transport EngineeringMinistry of TransportTianjin300456China Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and TechnologyOcean University of ChinaQingdao266100China Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2023年第42卷第2期

页      面：29-43页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：The National Natural Science Foundation of China under contract No.41676003 

主　　题：simplification of nonhydrostatic model submesoscale wave internal lee wave 

摘      要：This paper examines the simplification strategy of retaining only the nonhydrostatic effect of local acceleration in a three-dimensional fully nonhydrostatic model regarding the submesoscale wave phenomenon in the *** scale analysis of the vertical component of the Reynold-averaged Navier-Stokes(RANS)equation was performed,confirming the rationalization of this ***,the simplification was implemented in a RANS equation-based nonhydrostatic model NHWAVE(nonhydrostatic WAVE)to make a simplified nonhydrostatic *** examples were taken to test its performance,including surface sinusoidal waves propagating on an idealized East China Sea topography,tidally induced internal lee waves and small-scale solitary *** results show that in a considerably wide range of nonlinear strengths,the simplified nonhydrostatic model can obtain similar results as those in the fully nonhydrostatic model,even for smaller-scale solitary *** influences the applicability of the *** stronger the nonlinearity is,the worse the simplified model describes the nonhydrostatic *** general,the simplified nonhydrostatic model can simulate surface waves better than internal *** of computational efficiency in the simplified nonhydrostatic model is reasonable,reducing the central processing unit time duration in the fully nonhydrostatic model by 16.4%–20.6%.The specially designed algorithm based on the simplified nonhydrostatic equation can remarkably reduce the computational time.