An Analysis of Transient Flow in a Clean Room by a Modified GSMAC Finite Element Method

Abstract

Clean room facilities have recently become indispensable to various kinds of industries. In order to design a clean room, it is important to consider the improvement of the working environment as well as energy conservation. The air flow in a clean room is very complex. It consists of recirculation flows, and the direction of mean air flow is changed locally. A method of numerical simulation has been developed to delineate guidelines for the ventilation design of a clean room. This paper presents a modified finite element analysis for solving unsteady incompressible Navier-Stokes equations. This scheme is based on the algorithm of the HSMAC (highly simplified marker and cell) method in SOLA and the general idea of orthogonal decomposition. It has actually been applied to the case of the lid-driven square cavity flow at Reynolds number 10000, and to air flow in a conventional clean room. Unsteady flow simulations in terms of stream lines, equipressure lines and equivorticity lines are obtained on a color graphic display.