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mathematical modelling

Local comfort and air quality quantification via integrated building simulation

This paper describes the CFD model implemented within a building simulation program (ESP-r). It gives results examples to demonstrate the application potential of the model to calculate local comfort conditions and air quality.

Numerical prediction of natural ventilation by means of CFD

This paper intends to find a simplified method for the prediction of natural ventilation in a cross ventilated room . This method is based on the use of pressure boundaries instead of the modelling of a larger domain.

Design of low-energy cooling systems by using coupled energy simulation and computational fluid dynamics

This paper demonstrates the importance of the combined use of an energy simulation program and a CFD program for an accurate design of two low energy cooling systems : displacement ventilation and a combined chilled ceiling with displacement ventilation.

The simulation of ventilation of entrance atrium in the Moravian library

In the paper, based on MS Thesis by Julinek, 2001, the authors describe CFD modelling of the natural and mixed convection of air inside the entrance atrium of the Moravian library in Brno, Czech Republic. The eight-floor high atrium is formed with eight galleries, which are linked together with staircase, on one side and with glass wall on the other side. Inside the atrium, combination of natural and forced ventilation is used.

Influence of non-uniform airflow from different directions in the thermal comfort level in seated persons

For that study , an heated manikin, in a seated position, is exposed to a local thermo ventilator that promotes a non-uniform horizontal flow ( front , behind and right side) ; an interior climate analyser measures the environmental variables around the manikin. Those data are used as inputs of the numerical program.
A numerical model simulates the human and clothing thermal systems and evaluates the thermal comfort level. Verification was made that when the ventilator is places in front of the manikin, acceptable thermal comfort conditions are fullfilled.

A single tool to assess the heat and airflows within an enclosure : preliminary test

The results of a study testing the possibility of using Dynamical Thermal Modelling (DTM) techniques within CFD are reported in this paper. Two test procedures (an extensive one and a simplified one) were conducted for the modelling of an enclosure, to model heat exchanges through building materials and effects on internal temperatures and air flows.

Thermal comfort assessments of indoor environments by means of CFD

The paper deals with the CFD analysis performed for a family house residence, which is in the design phase : the aim was to test several concepts for heating ( floor heating, floor convectors, both systems) in terms of thermal comfort.

Macroscopic airflow analysis and the conservation of kinetic energy

This paper deals with an approach to a multizone airflow analysis that can account for mechanical energy conservation. It is shown that the resistance (dissipation) provided by zones in a multizone analysis should not be ignored.

Predictions of turbulence behaviour using k-epsilon model in operating theatres

This work concerns turbulence levels in a practical operating theatre of a 1200 beds Egyptian modern teaching hospital. The turbulence characteristics were represented by a modified k - epsilon model. Then a series of experimental investigations were preformed in the operating room to investigate the flow and temperature patterns and to assess the validity of the numerical model to be used.

Evaluation of ventilation system efficiency using CFD analysis

This paper deals with the development of 2 approaches for the modelling of the transport of gaseous pollutant with CFD code Fluent. The pollutant is either considered as a scalar and modelled with a transport equation, or it is described through species transported modelling. The 2 methods are presented and the results compared to those obtained from an experiment made in a test cell with tracer gas SF6.

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