Hydrodynamic theory of wet particle systems - Modeling, simulation and validation based on microscopic and macroscopic descriptions

拟议的研究项目的目标是开发一个流体动力学描述的湿颗粒材料的流动，这是基于微观尺度和宏观尺度的材料参数之间的联系的详细知识。该项目的主要目标是：（i）为应力-应变关系制定合适的本构方程，特别是湿颗粒材料，（ii）从离散元模拟中推导本构方程中的参数，（iii）用湿颗粒材料的适当实验数据验证微观-宏观转变，以及（iv）开发新的，更有效的宏观模拟工具，以模拟逼真的大规模实验。作为主要的工作假设，假设本构应力-应变关系可以由广义流体动力学类模型来描述，其中本构模型的参数取决于局部流动参数，例如润湿液体和颗粒固相的密度、压力、剪切速率或体积分数。

The objective of the proposed research project is to develop a hydrodynamic description of the flow of wet granular materials, which is based on detailed knowledge of the links between micro-scale and macro-scale material parameters. The main targets of the project are (i) the formulation of suitable constitutive equations for the stress-strain relations, specifically for wet granular materials, (ii) the deduction of the parameters in the constitutive equations from discrete element simulations, (iii) the validation of the micro-macro transition with data from suitable experiments with wet granular materials and (iv) the development of new, more efficient macroscopic simulation tools to model realistic, large-scale experiments. As the main working hypothesis, it is assumed that the constitutive stress-strain relations can be described by generalized fluid dynamics-like models, where the parameters of the constitutive model depend on local flow parameters, like e.g. density, pressure, shear rate or volume fractions of the wetting liquid and of the particulate solid phase, respectively.