Review of four turbulance models using topology

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

Performance of deterministic workplace exposure assessment models for various contaminant sources, air inlet and exhaust locations

This study compares the contaminant concentration obtained from simple models with contaminant concentration fields obtained from CFD simulations, for various rooms and source configurations. Airflow and contaminant distributions were simulated.

Comparing zonal and CFD model predictions of isothermal indoor airflows to experimental data

This paper is the investigation of two approaches for describing the details of air-flow in large indoor spaces. One approach is the zonal method, and the second one uses a CFD model.Results swow that when airflows details are necessary, coarse-grid CFD is a better method for predicting airflow in large indoor spaces than the zonal methods.

Thermal comfort study of an air-conditioned lecture theatre in the tropics

Objective measurement, CFD modelling and subjective assessment have been used in that study to evaluate the thermal comfort of an air-conditoned lecture theatre in the tropics. The simulated parameters are temperature, airflow rate and relative humidity.The parameters were found in the limits of the comfort standard. Occupants' vote show that they were uncomfotable and dissatisfied.

Measurements and computations of contaminant's distribution in an office environment

The dispersion of contaminants in an office environment has been investigated. The first experiment was made in a full-scale typical office equipped with two workstations located in the middle of the room and separated by a low-level partition, and the second experiment took place in a room separated in two halves with a low level partition, with one workstation at each corner. A constant injection of tracer gas allowed the measurement of the concentration of contaminant in the chamber for both the layouts.

Design analysis of single-sided natural ventilation

For the study of single-sided natural ventilation, a CFD model along with analytical and empirical models have been used, to determine the effects of buoyancy, wind, or their combination on ventilation rates and indoor conditions.

Toward external coupling of building energy and airflow modeling programs

This paper presents the objectives and results of the initial stage of an ongoing research project on coupling of building energy simulation (BES), airflow network (AFN), and computational fluid dynamics (CFD) programs. The objective of the research underlying this paper is to develop and verify a prototype cooperative BES, AFN, and CFD design environment for optimization of building energy performance and indoor environment.

An adaptive conflation between CFD and thermal simulation for modeling indoor airflow and convective heat transfer at internal building surfaces

A adaptive controller was devised and implemented within the ESP-r simulation program to support the conflation of CFD with dynamic whole building thermal simulation. This controller manages all interactions between the coupled thermal and CFD modeling domains. It employs a quasi-steadystate modeling approach, wherein the separate CFD and thermal modeling domains operate in tandem and exchange information at their model domain boundaries on a per-time-step basis. A double-pass modeling approach is employed.

CFD analysis of ventilation system performance for enclosed parking garages

In this paper, a CFD analysis of airflow and contaminant distribution within enclosed vehicular parking facilities is presented. First, the CFD simulation is validated using field data. Then, the results of a parametric CFD analysis are summarized. In particular, it was found that significant fan
energy savings can be obtained when simple on-off controls are properly implemented without affecting the indoor air quality within the garage. Moreover, it was found that the position

Experimental and theoretical analysis of natural ventilation by windows opening

After a review of CFD models and a simplified (zonal) models predictions, a simplified procedure, based on charts and non dimensional groups, is proposed in order to evaluate the ventilation rate through an open vertical window.