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首页> 外文期刊>Chemical Engineering Science >Direct numerical simulation of complex multi-fluid flows using a combined front tracking and immersed boundary method
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Direct numerical simulation of complex multi-fluid flows using a combined front tracking and immersed boundary method

机译：复杂的多流体流动的直接数值模拟，采用前跟踪和沉浸边界相结合的方法

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In this paper a simulation model is presented for the Direct Numerical Simulation (DNS) of complex multi-fluid flows in which simultaneously (moving) deformable (drops or bubbles) and non-deformable (moving) elements (particles) are present, possibly with the additional presence of free surfaces. Our model combines a Front Tracking (Fr) model developed by van Sint Annaland et al. (2008. Numerical simulation of dense gas-solid fluidized beds: a multiscale modeling strategy. Ann. Rev. Fluid Mech. 40, 47-70.) and an Immersed Boundary (1B) model developed by van der Hoef et al. (2008. Numerical simulation of dense gas-solid fluidized beds: a multiscale modeling strategy. Ann. Rev. Fluid Mech. 40, 47-70.) The FT part circumvents the explicit computation of the interface curvature. The IB part incorporates both particle-fluid and particle-particle interaction via a direct forcing method and a hard sphere Discrete Particle (DP) approach. In our model a fixed (Eulerian) grid is utilised to solve the Navier-Stokes equations for the entire computational domain. The no-slip condition at the surface of the moving particles is enforced via a momentum source term that only acts in the vicinity of the particle surface. For the enforcement of the no-slip condition Lagrangian force points are used, which are distributed evenly over the surface of the particle. Dissipative particle-particle and/or particle-wall collisions are accounted via a hard sphere DP approach using a three-parameter particle-particle interaction model accounting for normal and tangential restitution and tangential friction. The capabilities of the hybrid FT-IB model are demonstrated with a number of examples in which complex topological changes in the interface are encountered.
机译：本文为复杂的多流体流的直接数值模拟（DNS）提出了一种仿真模型，其中同时存在（移动）可变形（滴或气泡）和不可变形（移动）元素（粒子），可能存在自由表面的额外存在。我们的模型结合了van Sint Annaland等人开发的Front Tracking（Fr）模型。 （2008年。致密气固流化床的数值模拟：多尺度建模策略。AnnRev. Fluid Mech。40，47-70。）和van der Hoef等人开发的浸入边界（1B）模型。 （2008.致密气固流化床的数值模拟：多尺度建模策略。AnnRev. Fluid Mech。40，47-70。）FT部分规避了界面曲率的显式计算。 IB部分通过直接强迫方法和硬球离散粒子（DP）方法结合了粒子-流体和粒子-粒子的相互作用。在我们的模型中，使用固定（欧拉）网格来求解整个计算域的Navier-Stokes方程。通过仅作用于粒子表面附近的动量源项来增强运动粒子表面的防滑条件。为了实施防滑条件，使用了拉格朗日力点，这些力点均匀地分布在粒子表面上。耗散的粒子间和/或壁间的碰撞是通过硬球体DP方法解决的，该方法使用三参数粒子间相互作用模型解决了法向和切向复原以及切向摩擦问题。混合FT-IB模型的功能通过许多示例进行了演示，这些示例在界面中遇到了复杂的拓扑变化。

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