Fluid Dynamics - understanding fluid dynamics to improve our lives

本项目旨在通过研究非牛顿流体在打印过程中的流体动力学来提高3D打印对象的质量。通过研究这些材料的性质、屈服应力、触变性和剪切稀化行为，我们的目标是提高印刷物体的质量。例如，具有高屈服应力的浆料将防止从喷嘴滴落，并允许在坍塌发生之前建造高大的物体。剪切稀化行为使材料能够更有效地挤压，而触变性帮助材料迅速恢复高粘度，防止立即坍塌并保持其形状。该项目将把本构关系的理论模型整合到开源软件OpenFOAM中来模拟流动。最初，模拟将在2D中实施，以研究复杂的流体是如何从喷嘴挤出的。然后，这项研究将扩展到3D模拟，以模拟这种材料的坍塌效应。对材料流变学的详细了解将允许开发特定于材料的方案，以实现更高质量的最终产品。

This project aims to enhance the quality of 3D-printed objects by investigating the fluid dynamics of non-Newtonian fluids during the printing process. The properties of these fluids change throughout the printing process due to their transient non-linear rheology.By studying the properties of these materials, yield stress, thixotropy, and shear thinning behaviour, we aim to improve the quality of printed objects.For example, a paste with high-yield stress will prevent dripping from the nozzle and allow for the construction of tall objects before slumping occurs. Shear thinning behaviour enables the material to be extruded more efficiently, while thixotropy helps the material quickly regain high viscosity, preventing immediate slumping and maintaining its shape.This project will integrate theoretical models of constitutive laws into the open-source software OpenFOAM to simulate the flow. Initially, the simulations will be implemented in 2D to study how the complex fluid is extruded from the nozzle. The study will then extend to 3D simulations to model the slumping effects of the material. A detailed understanding of material rheology will allow for the development of material-specific protocols to achieve higher-quality final products.