Interakce kapaliny a stěny potrubí při nestacionárním proudění

Abstract

This thesis deals with the experimental and numerical methods for determining the properties of hydraulic lines and hydraulic oil and their influence on the dynamics of the hydraulic circuit. Further it is aimed at modeling the interaction of liquid and solid components i.e. Fluid-Structure Interaction (FSI) analysis. The introductory section provides the aims of the thesis and overview of the current state of analysis of the FSI problem and research of hydraulic oil and hydraulic lines properties. There is a problem analysis of modulus of elasticity of the hydraulic lines, hydraulic oil including undissolved air. Then mathematical models for one-dimensional (1D) and three-dimensional (3D) flow simulations are created. The experimental section describes the measuring methodology and the evaluation of modulus of elasticity of the hydraulic oil and the hydraulic hoses. The results are used in the 1D mathematical models as boundary conditions. These models are then verified by experiments focused mainly on examining the dynamics of the hydraulic circuit. The final chapter describes the methodology of 3D modeling FSI analysis using Ansys APDL and Ansys Fluent programmes. In conclusion of this dissertation a summary of the achievements and lessons learned is provided.