论文标题
有效的四向耦合晶格玻尔兹曼 - 离散元素方法，用于完全分辨颗粒的流量的模拟
An efficient four-way coupled lattice Boltzmann - discrete element method for fully resolved simulations of particle-laden flows
论文作者
论文摘要
开发和分析了用于直接数值模拟的四向耦合方案。它采用了一种新型的自适应多释放时间晶格玻尔兹曼方法来有效模拟流体相。动量交换方法用于将流体和颗粒相。使用线性接触力通过离散元素方法来解释正常和切向方向的粒子相互作用。对方案的所有参数进行了详细研究和评估，并为其选择的精确准则进行了评估。该开发是基于几个精心选择的校准和提高身体复杂性的验证测试。发现良好的润滑模型对于获得粘性流体中平面壁碰撞的球体的正确轨迹至关重要。为了充分解决碰撞动力学，发现碰撞时间必须适当拉长。完整的测试集建立了一条验证管道，可以普遍应用于其他流体粒子耦合方案，该方案提供了一种可以指导未来发展的系统方法论。
A four-way coupling scheme for the direct numerical simulation of particle-laden flows is developed and analyzed. It employs a novel adaptive multi-relaxation time lattice Boltzmann method to simulate the fluid phase efficiently. The momentum exchange method is used to couple the fluid and the particulate phase. The particle interactions in normal and tangential direction are accounted for by a discrete element method using linear contact forces. All parameters of the scheme are studied and evaluated in detail and precise guidelines for their choice are developed. The development is based on several carefully selected calibration and validation tests of increasing physical complexity. It is found that a well-calibrated lubrication model is crucial to obtain the correct trajectories of a sphere colliding with a plane wall in a viscous fluid. For adequately resolving the collision dynamics it is found that the collision time must be stretched appropriately. The complete set of tests establishes a validation pipeline that can be universally applied to other fluid-particle coupling schemes providing a systematic methodology that can guide future developments.
