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首頁> 外文學(xué)位 >Dynamic simulation of suspended particles and drops at finite Reynolds numbers by dissipative particle dynamics.
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Dynamic simulation of suspended particles and drops at finite Reynolds numbers by dissipative particle dynamics.

機(jī)譯：通過耗散粒子動力學(xué)動態(tài)模擬有限雷諾數(shù)下的懸浮粒子和液滴。

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Dissipative Particle Dynamics (DPD) is a recently developed method for simulating complex fluid flows and other colloidal phenomena. It is a mesoscopic method, in that it does not rely on a continuum-level description of matter, but nor does it completely capture molecular-level detail. In DPD a particle is a fluid packet that consists of a group of molecules, and each particle interacts with the other particles in ways that conserve both mass and momentum. In order to explore its potential as a method for studying suspensions and emulsions, we have used a novel implementation of DPD to calculate a variety of transport properties pertaining to two-phase systems. Fast DPD algorithm is devised to reduce the computational time to O(N) from conventional O( N2). For solid-liquid systems, these properties include the hydraulic permeability of fibrous porous media, and the drag on a sphere at low and moderate Reynolds numbers. Trajectories of a falling cylinder in a two-dimensional channel are calculated in an intermediate inertia regime as well as the rotational speed of circular and elliptical cylinders. We have also shown that, by including two populations of particles in the simulations, and having different levels of soft, repulsive interactions between them, two-phase liquid-liquid systems can be modeled. In particular, calculations of the surface tension and deformation of two- and three-dimensional liquid drops in shear flows show the expected behavior. The behavior of deformation parameter and oscillation in the aspect ratio of DPD drops also yields the correct behavior. Finally, in our liquid-liquid simulations we have constructed model surfactants comprised of two particles, one from each population. These amphiphilic particles reduce the surface tension at liquid-liquid interfaces, providing a basis for mesoscopic simulations of colloidal systems such as solutions of micelles and microemulsions.
機(jī)譯：耗散粒子動力學(xué)（DPD）是最近開發(fā)的用于模擬復(fù)雜流體流動和其他膠體現(xiàn)象的方法。它是介觀方法，因?yàn)樗灰蕾囉趯ξ镔|(zhì)的連續(xù)性級別的描述，但是也不能完全捕獲分子級的細(xì)節(jié)。在DPD中，粒子是由一組分子組成的流體包，每個(gè)粒子與其他粒子以既保持質(zhì)量又保持動量的方式相互作用。為了探索其作為研究懸浮液和乳液的方法的潛力，我們使用了DPD的新穎實(shí)現(xiàn)方式來計(jì)算與兩相系統(tǒng)有關(guān)的各種傳輸特性?？焖貲PD算法旨在將計(jì)算時(shí)間從傳統(tǒng)的 O （ N O （ N ） > 2 ）。對于固液系統(tǒng)，這些屬性包括纖維狀多孔介質(zhì)的水力滲透性，以及在低和中等雷諾數(shù)下在球體上的阻力。在中間慣性范圍以及圓柱和橢圓圓柱的旋轉(zhuǎn)速度下，計(jì)算二維通道中下降圓柱的軌跡。我們還表明，通過在模擬中包括兩個(gè)粒子群，并在它們之間具有不同程度的軟性，排斥性相互作用，可以對兩相液-液系統(tǒng)進(jìn)行建模。特別是，剪切流中二維和三維液滴的表面張力和變形的計(jì)算顯示了預(yù)期的行為。 DPD縱橫比的變形參數(shù)和振動行為也會產(chǎn)生正確的行為。最后，在我們的液-液模擬中，我們構(gòu)建了由兩個(gè)粒子組成的模型表面活性劑，每個(gè)粒子一個(gè)。這些兩親性顆粒降低了液-液界面處的表面張力，為膠體體系（如膠束和微乳液溶液）的介觀模擬提供了基礎(chǔ)。

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