Modelling the horizontal flow of the atmosphere using finite elements
by N. Ichikawa, T. Shigeta, K. Shirota
International Journal of Computer Applications in Technology (IJCAT), Vol. 11, No. 3/4/5, 1998

Abstract: The purpose of this study is to present a new numerical treatment of the boundary conditions on the open boundary, which removes the non-physical reflection of the wave. In order to describe the motion of air in the earth's atmosphere, a numerical solution of the averaged primitive flow equations is considered in this paper. Appropriate initial and boundary conditions should be imposed on the equations for the solution to be uniquely determined. Our particular interest is the boundary conditions on an open boundary where the flow comes in or out. It is known that conventional treatment of the boundary conditions causes non-physical reflection. To determine suitable boundary conditions for primitive equations, the theory of characteristics provides guidance on the number and form of the boundary conditions. We determined the boundary conditions by the theory of characteristics. The primitive equations are discretised using the second-order Taylor-Galerkin method with linear finite elements, and boundary values are computed by the method of characteristics. We consider simple numerical experiments of one- and two-dimensional problems. As a result, it is concluded that spurious oscillation is eliminated.

Online publication date: Sun, 01-Jun-2014

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Computer Applications in Technology (IJCAT):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com