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Object oriented programming and applications of boundary element method in ground vehicle aerodynamics

Chiu T. W.

Computer Assisted Mechanics and Engineering Sciences

2000

Vol. 7, No. 2

185-193

The phenomenal development and popularisation of Object Oriented Programming (OOP) in recent years has created a new dimension in the innovation and implementation of powerful panel method techniques. Although many scientists and engineers are already employing OOP languages such as C++, some of them are still using the languages in a procedural and non-hierarchical manner, leaving a large proportion of these languages' capability unexplored. This paper presents the idea and implementation of OOP in the panel method, which is widely used in ground vehicle aerodynamics. Program examples will show that OOP enables the writing of highly modularised, reusable, readable and debuggable panel method programs. Keywords: object oriented programming, panel method, BEM, ground vehicle aerodynamics.

Absolute instabilities of a finite lenght vortex street with external axial velocities

Chiu T. W., Berney A. H.

Computer Assisted Mechanics and Engineering Sciences

1998

Vol. 5, nr 2

161-172

This paper presents a numerical algorithm for the study of the absolute instability of a vortex street with external axial velocities and finite length vortices. The aim is that this will be of relevance to the study of the flow over slender bodies at yaw. The algorithm is based on the vortex dynamics momentum equation. Special core treatments have been implemented to tackle the problem of infinite self-induced velocity. A small pertubation method is then used to formulate the eigenvalue problem.