In many cases sample coordinates are recorded on an orthogonal grid coordinate system . 在多數(shù)情況下,樣品坐標(biāo)記錄在正交網(wǎng)絡(luò)坐標(biāo)系。
For convenience of grid refinement implementation the nonstaggered grid system based on the structured orthogonal grid scheme is adopted . in order to eliminate the possible pressure wiggles when nonstaggered grid is used , except for the use of the momentum interpolation method ( small wiggles still appear when the method is adopted alone ) , a new method is proposed and applied in the same time . in the new method a pressure - gradient difference term is added to the flow velocity in each control volume interface when dealing with the pressure - correction equation 本文基于結(jié)構(gòu)化正交網(wǎng)格,為便于實(shí)施網(wǎng)格加密,采用了變量同位存儲(chǔ)的同位網(wǎng)格體系;為平抑該網(wǎng)格體系下的壓力振蕩問題,除采用動(dòng)量插值方法外(單純采用該方法不能完全平抑振蕩) ,首次提出了在壓力校正方程的界面流速中添加壓力梯度差值項(xiàng)的方法,從而完全解決了建筑風(fēng)場模擬中同位網(wǎng)格下可能出現(xiàn)的不合理壓力場的問題。
The expression of the improved boussinesq equations in curvilinear orthogonal coordinate system is derived . on the basis of poission equation conversion , the methods to generate curvilinear orthogonal grids are introduced , and then the two - dimensional numerical wave model under curvilinear orthogonal coordinate system is established 推導(dǎo)了正交曲線坐標(biāo)系下的改進(jìn)型boussinesq方程,以poission方程變換為基礎(chǔ),建立擬合正交曲線坐標(biāo)系下正交曲線網(wǎng)格的生成方法,進(jìn)而建立正交曲線坐標(biāo)系下的二維波浪模型,提高了模型對(duì)復(fù)雜地形的適用性。