An investigation of fluid motion inside shock absorbers by numerical simulation.

摘要

Fluid behavior inside a shock absorber under various conditions is investigated using commercially available CFD code, STAR-CD. Incompressible laminar and turbulent models are used with two forcing functions (constant speed and sinusoidal). Moving boundaries are specified based on the mass conservation. Newtonian and a combination of Newtonian and Non-Newtonian (Power law and modified Bingham plastic) models are considered.; The effects of the geometry and the forcing conditions on flow velocity and pressure fields are investigated. The results of the flow field visualization are presented in terms of velocity vector and pressure contour plots. Damping force on the piston is calculated and presented as functions of piston displacement and piston speed. The results agree quantitatively with that of experiments for Newtonian, incompressible, laminar and turbulent flows.