Numerical Simulation Model And Application Of Moving Grid For Adapting Typhoon Wave Forecast

The frequent typhoon waves generated in the Western Pacific and South China Sea are a serious threat to the exploitation and utilization of the South China Sea,especially when the typhoon waves spread to coastal areas,there is an immeasurable threat to the life and property safety of the people in the coastal cities of China.Therefore,accurate simulation and prediction of typhoon waves in the South China Sea is the key and difficult point to the study of ocean waves.Based on the SWAN model,this paper puts forward a set of scheme about numerical model for typhoon wave forecast in moving with the center of typhoon wave and locally refining using unstructured grid,and Analysis and research on the model of the south China sea wave simulation calculation.The paper Fistly make some improvements and optimizations on Easymesh source program,which can solve the incompatible problem of geometric and topology.the paper secondly base on the LOP algorithm and iterative Laplacian algorithm smoothing technique to optimizating and smoothing the generated mesh.meanwhile,A program is putted which is compiled and this program can automatically dispose and optimize coastline of regions which provide prepared file for Easymesh.Based on automatical unstructured grid procedure.the paper establish a numerical simulation model for adapting typhoon wave forecat on SWAN model.This model includes the dispose of the coastline?the automatic subdivision and optimization of the unstructured grid and the information topology of the different grid nodes.The grid system is updated once cvery 6 hours.At the same time,the model introduce the MPI parallel which greatly increase the efficiency on the topology of grid.At last,the paper apply this mobile model to the typhoon waves simulated,such as Kai-tak?Nalage and Doksuri.Compared with fixed model and the measured values,The result shows that the model can depict the growth proces of the wind waves.At the same time,the paper compare the influence of sea wave simulation,which apply different refining scale.It also provide reasonable suggestions of refining scale.The analysis between two models is applied on space and time contrast and it showed that the difference are manifested on regions which is as large as three times of the maximum wind speed radius.thus,it can provided a reference for the choice of grid refinement radius.