本文選題：Lagrangian粒子法　切入點(diǎn)：有限點(diǎn)法　出處：《天津大學(xué)學(xué)報(自然科學(xué)與工程技術(shù)版)》2016年10期 　論文類型：期刊論文

【摘要】：Lagrangian粒子法是近年來新興的一類無網(wǎng)格方法.基于該廣義理論下的有限點(diǎn)法,將問題求解域離散為有限個空間粒子點(diǎn),借助移動最小二乘法獲得粒子的物理場函數(shù),利用投影法分步求解拉格朗日形式下的不可壓縮Navier-Stokes方程,最后數(shù)值模擬得到S60船模各二維橫剖面在橫搖時的渦模式,有效地捕捉到船體周圍流場的非線性特征,如流體分離、漩渦泄出等.計算結(jié)果表明:船舯附近的剖面在橫搖時,在其舭部周圍將會產(chǎn)生兩個渦,故舭部表面壓力呈正負(fù)交錯變化;當(dāng)剖面位置逐漸靠近船艏或船艉時,其舭部渦縮減為一個,此時舭部附近壓力符號無變化.將該數(shù)值計算結(jié)果與試驗(yàn)進(jìn)行對比驗(yàn)證,二者吻合較好,說明Lagrangian觀點(diǎn)下的有限點(diǎn)法針對船體各橫剖面的橫搖阻尼渦模式均給出了較為準(zhǔn)確的數(shù)值模擬結(jié)果,有效驗(yàn)證了本文計算方法的可靠性.
[Abstract]:Lagrangian particle method is a new kind of meshless method in recent years. Based on the finite point method under the generalized theory, the solution domain of the problem is discrete into finite space particle points, and the physical field function of the particle is obtained by moving least square method. The incompressible Navier-Stokes equation in Lagrangian form is solved step by step by the projection method. Finally, the vortex modes of each 2-D transverse section of S60 ship model are obtained by numerical simulation, which effectively capture the nonlinear characteristics of the flow field around the hull, such as fluid separation. The calculated results show that when the profile near amidships is rolling, two vortices will be produced around the bilge, so the surface pressure of bilge shows a positive or negative staggered change, and when the profile is close to the bow or stern of the ship, The bilge vortex is reduced to one, and there is no change in the pressure symbol near the bilge. The numerical results are compared with the experimental results and the results are in good agreement with each other. It is shown that the finite point method based on Lagrangian's viewpoint gives more accurate numerical simulation results for the rolling damping vortex models of the ship's cross sections, which effectively verifies the reliability of the proposed method.
【作者單位】： 哈爾濱工程大學(xué)船舶工程學(xué)院;中集船舶海洋工程設(shè)計研究院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51379040)
【分類號】：U661.321
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本文編號：1603700