Nonlinear dynamic analysis of natural ventilation in a two-zone building : Part A : Theoretical analysis

The first part of this paper is a presentation of a simple method using commercial CFD software to obtain the solution multiplicity characteristics of laminar and turbulent indoor airflows.A two-zone naturally ventilated building with four openings is considered in that study. Nonlinear dynamic behaviors are analyzed. Different flow modes were identified with the same physical and boundary conditions. A multi-zone airflow and thermal coupled program was also used to evaluate the results.That theroretical analysis can help to properly design natural ventilation in real buildings.