Implementation and assessment of a low Reynolds number k-e turbulence model for natural convection flow.

The purpose of this study is to test the Launder-Sharma low Reynolds number k-e model. This model is intended to improve the forecasting of aerothermal behaviour in air conditioned rooms. The model is based on the high Reynolds number k-e mode

An invariant of the age of air: proof and applications.

After a short introduction of the "age of air" concept in ventilation, a theorem of conservation for the age of air at the outlet is presented. Restrictions to validity and two applications (to measurements and numerical simulation) are described. A rigorous analytic proof is shown based on field theory.