Numerical computations for moderate Reynolds number flows with a moving body
Date Issued
2009
Date
2009
Author(s)
Wu, Chia-Shan
Abstract
In this thesis, the numerical model which is the finite-difference model with hybrid Cartesian/immersed boundary method is applied for solving the 2D and 3D Navier-Stokes equations with immersed and moving boundary on a fixed Cartesian grid. There are two studies in 2D which are carried out to verify the robustness of the present model with reference data from uniform flow past a stationary circular cylinder, and in-line oscillating circular cylinder in a fluid at rest. However, the numerical model is applied to simulate a moving boundary problem which is dropping sphere with constant velocity in 3D flow field. Therefore, the flow field is asymmetric at Reynolds numbers above 500 from both experimental and numerical results. Moreover, the flow field after impact at Reynolds number equals to 800, the combined vortex ring rolls upward to contact the primary vortex ring and acts as a 3D motion in all directions. Therefore, the numerical simulations can fill up the lack of the results in experiment within 3D visualization.
Subjects
Moving boundary
finite-difference method
immersed boundary technique
Navier-Stokes equations
Reynolds number
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96521314-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):0daa365decf375b02b87c43c2db262ea