When we analyze non-isothermal turbulent flowfield, we have both cases of stable and unstable. The modified new k-ε model (MKCO k-ε) which can reproduce both damping and accelerating vertical turbulence flux by buoyancy has been devised. A 2-D simulation is conducted for non-isothermal room airflow using the modified model. The results are compared with those of the model experiment and those based on other k-ε models. The present model predicts it better than the existing models.
