2-D NUMERICAL STUDY OF PASSIVE SCALAR DIFFUSION FIELD AND NON-ISOTHERMAL FLOW FIELD : Room Airflow Analysis by Means of Algebraic Stress Model (Part 2)

Abstract

In this paper, two-dimensional passive scalar diffusion field and non-isothermal flow field are studied by using the algebraic stress model (hereafter abbreviated as ASM). In ASM, Reynolds stress (-<u_iu_j>^^^-) and scalar flux (u_iθ) are evaluated by the algebraic expression representation of transport equation for <u_iu_j>^^^- and <u_iθ>^^^-. Therefore the results of the distribution of <u_iu_j>^^^- and <u_iθ>^^^- in ASM are physically more reasonable than those given by the κ-ε EVM. The differences of the distributions of velocity and scalar (temperature) between ASM and κ-ε are attributed to the differences of the evaluation <u_iu_j>^^^- and <u_iθ>^^^-.