本文選題：光滑粒子流體動(dòng)力學(xué) + 動(dòng)床�。� 參考：《中國(guó)科學(xué)院大學(xué)學(xué)報(bào)》2017年05期

【摘要】：光滑粒子流體動(dòng)力學(xué)(SPH)方法采用離散分布的粒子作為離散工具,借助粒子和核函數(shù)將場(chǎng)變量及其導(dǎo)數(shù)以某種加權(quán)求和的方式進(jìn)行計(jì)算,使得該方法更適于處理包含大位移、動(dòng)邊界和自由表面的問題。本文在分析動(dòng)床條件下的潰壩問題時(shí),以Drunker-Prager準(zhǔn)則作為底床顆粒物的侵蝕啟動(dòng)判斷條件。滿足該條件而發(fā)生啟動(dòng)的顆粒物將以非牛頓流體的特征發(fā)生運(yùn)動(dòng),即以Herschel-Bulkley-Papanastasiou模型來描述;否則,認(rèn)為底床顆粒物未啟動(dòng)而保持靜止?fàn)顟B(tài)。為進(jìn)一步改進(jìn)計(jì)算結(jié)果,采用基于體積比的兩相SPH方法描述固液混合體的動(dòng)力學(xué)特征,并基于固液混合顆粒流的動(dòng)力學(xué)特征對(duì)混合黏度的計(jì)算進(jìn)行改進(jìn)�；谏鲜鲈�,分析動(dòng)床條件下的潰壩問題,并將數(shù)值計(jì)算結(jié)果與已有的實(shí)驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比,證明本文提出的混合黏度計(jì)算公式改進(jìn)了數(shù)值計(jì)算結(jié)果。
[Abstract]:The smooth particle hydrodynamics (SPH) method uses discrete particles as a discrete tool and computes field variables and their derivatives in a weighted summation way by means of particles and kernel functions, which makes the method more suitable for dealing with large displacements. The problem of moving boundary and free surface. In this paper, the Drunker-Prager criterion is used as the criterion for judging the erosion start of particulate matter in the bottom bed when analyzing the dam-break problem under moving bed conditions. The particles that meet this condition will move in the form of non-Newtonian fluid, that is, the Herschel-Bulkley-Papanastasiou model, otherwise, it is considered that the particles in the bottom bed remain at rest without starting. In order to further improve the calculation results, the two-phase SPH method based on volume ratio is used to describe the dynamic characteristics of solid-liquid mixture, and the calculation of mixing viscosity is improved based on the kinetic characteristics of solid-liquid mixed particle flow. Based on the above principle, the dam-break problem under moving bed condition is analyzed, and the numerical results are compared with the existing experimental data. It is proved that the mixed viscosity calculation formula proposed in this paper improves the numerical results.
【作者單位】： 中國(guó)科學(xué)院水利部成都山地災(zāi)害與環(huán)境研究所中國(guó)科學(xué)院山地災(zāi)害與地表過程重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);安徽理工大學(xué)土木建筑學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(41372331,41672318) 中國(guó)科學(xué)院西部之光人才培養(yǎng)計(jì)劃在職博士研究生資助項(xiàng)目資助
【分類號(hào)】：O35
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本文編號(hào)：2027706