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SIMULATION OF INCOMPRESSIBLE MULTIPHASE FLOWS USING THE ARTIFICIAL COMPRESSIBILITY METHOD

机译:用人工压缩方法模拟不可压缩的多相流

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The Eulerian methods are susceptible to generate the nonphysical spurious currents in the multiphase flow simulations near the interfaces. This paper presents a new Eulerian method to accurately simulate the velocity fields, especially near the multiphase flow interfaces and prevents the numerical results from generating the nonphysical currents. A Eulerian central difference finite-volume scheme equipped with the suitable numerical dissipation terms is used to simulate incompressible multiphase flows. The interface is captured by Flux Corrected Transport-Volume of Fluid method (FCT-VOF). Increasing the accuracy near the sharp gradients, such as interface, the conservative form of incompressible Navier-Stokes equations is solved to locally conserve the properties. The main feature of this algorithm is its ability to control the pressure gradient oscillation and also spurious currents near the interface; two common problems in multiphase flow simulations, and as a result improves the accuracy of the simulation by artificial numerical dissipations. The results show the FCT-VOF is able to precisely calculate the interface, and the numerical dissipation terms are the powerful device to prevent the spurious currents.
机译:欧拉方法易于在界面附近的多相流模拟中生成非物理杂散电流。本文提出了一种新的欧拉方法,可以准确地模拟速度场,尤其是在多相流界面附近,并防止数值结果产生非物理电流。配备适当数值耗散项的欧拉中心差分有限体积方案用于模拟不可压缩的多相流。该接口通过“流量校正的流体输送量”方法(FCT-VOF)捕获。为了提高接近陡峭梯度(例如界面)的精度,解决了不可压缩的Navier-Stokes方程的保守形式,以局部保存属性。该算法的主要特点是它能够控制压力梯度振荡以及界面附近的杂散电流。多相流模拟中存在两个常见问题,因此通过人工数值耗散提高了模拟的准确性。结果表明,FCT-VOF能够精确计算界面,数值耗散项是防止杂散电流的有力工具。

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