SPH方法氣-液界面邊界條件研究
[Abstract]:To solve the problem of truncation of particle smooth function and non-physical penetration near the interface, a method for dealing with the boundary conditions of gas-liquid interface is proposed. When different material particles appear in the support region near the interface, virtual particles can be set up in each step in the support domain, the physical quantities of the virtual particles can be assigned according to the density distribution method, and the gas-liquid two-phase resistance is introduced to the particles near the interface. The SPH method and the Level-Set method are used to calculate the interaction of moving shock waves on the gas-liquid interface. The results are in agreement with each other, which preliminarily verifies the applicability of the treatment of the gas-liquid interface boundary conditions. The SPH method is used to calculate the flow and fall of circular cross section liquid column in supersonic airflow respectively. The particle pressure and normal velocity on both sides of the interface are continuous. The qualitative and reasonable results of bow shock wave, reflux region and downstream reflux zone are given. It is shown that the proposed method can avoid the phenomena of smooth truncation of fluid particles near the interface and non-physical particle penetration and numerical oscillation of the flow field near the interface.
【作者單位】: 清華大學(xué)航天航空學(xué)院;
【基金】:博士后基金(2015M581081) 中國(guó)運(yùn)載火箭技術(shù)研究院基金(CALT201601) 清華大學(xué)自主課題(20161080102)資助項(xiàng)目
【分類(lèi)號(hào)】:O35
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