The simulation has been performed using the CFD package SWIFT. In the first phase, meanflow and thermal comfort parameters of the integral living room of the modern family househave been calculated. In the second phase the effect of turbulence was the subject of interest.Two turbulence models, the k-e and the HTM (Hybrid Turbulence Model), were applied.HTM already showed good results in other application areas, e.g. aerodynamics of cars. Thepresent study demonstrates the new approach in modelling and calculating air conditioning ofthe rooms.
The validation and development of turbulence models are still important issues related to Computational Fluid Dynamics for ventilation purposes. The present work continues the work initiated by (Voigt, 2002). Four turbulence models are reviewed, the k-e model, the k-w model and two blending models combining the k-e and the k-w model. The reason for testing the blending
The paper presents a numerical study on the airflow within a single-sided heated room with a large vertical opening, with and without interaction of an air curtain. The influence of temperature differences between the heated wall and the exterior on the inflow has been investigated. Also how an air curtain, with different inlet velocities and widths, affect the flow and thermal patterns in the room have been examined. The RNG k-e turbulence model is used for capturing the fluid flow and heat transfer in the building and through the opening.
This paper defines a new parameter : the equivalent frequency used for the description of the frequency characteristics of air velocity in turbulent flows.Analyses were performed to identify how much the accuracy of determination of the equivalent frequency depends on the characteristics of the velocity. Results of the analyses identified that the equivalent frequency of the velocity fluctuations in rooms is between 0.1 et 1 Hz, and 90 % of those records were between 0.2 and 0.6 Hz which is the frequency range identified to have most significant impact on people's draught sensation.
The aim of this work is to investigate turbulent air flows, through measurements inside railway coaches employed for the transport of sick persons. In this kind of environment, assuring occupant comfort and eliminating potentially annoying draught is necessary for safeguarding patients inside the train. As it is known, air velocity is not uniform but, instead, it fluctuates. It is these fluctuations that are the origin of local discomfort. This can result in a draught, which is defined as a local undesired cooling of the body.