Unsteady hydrodynamic forces on spheroidal bodies

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Unsteady hydrodynamic forces on spheroidal bodies "
R. S. AlAssar

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112858
Doc. No	:	TLpq304335312
Main Entry	:	R. S. AlAssar
Title & Author	:	Unsteady hydrodynamic forces on spheroidal bodies\ R. S. AlAssar
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1996
student score	:	1996
Degree	:	Ph.D.
Page No	:	196
Abstract	:	The problem of incompressible axisymmetric flow over spheroidal bodies is considered. The analysis covers steady and unsteady flows of inviscid and viscous fluids. The spheroidal bodies may take the shape of spheres, oblate or prolate spheroids. The study is based on analytical and numerical solutions of the mass and momentum conservation equations. Euler's equations are solved analytically for the case of inviscid flow while the full Navier-Stokes equations are solved numerically for the case of viscous flow. The study focuses on the time variation of the velocity field as well as the hydrodynamic forces due to free-stream oscillations. The method of solution of the full Navier-Stokes equations combines analytical and numerical techniques where the stream function and vorticity are approximated using Legendre functions whereas the resulting differential equations are solved numerically. The parameters involved in the viscous flow problem are the Reynolds number, Strouhal number, and the spheroidal body geometry. The study covers Reynolds numbers in the range from 0.1 to 200 and Strouhal numbers in the range from usd\pi /4usd to usd2\pi .usd Results are presented in terms of the drag coefficient, surface vorticity and surface pressure distributions, and streamline and equi-vorticity patterns. Detailed analysis of the velocity field including the wake length and angle of separation is also presented.
Subject	:	Applied sciences
	:	axisymmetric
	:	Civil engineering
	:	computational fluid dynamics
	:	Mechanical engineering