References of "Barbason, Mathieu"
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See detailCoupling building energy simulation and computational fluid dynamics: Application to a two-storey house in a temperate climate
Barbason, Mathieu ULg; Reiter, Sigrid ULg

in Building & Environment (2014), 75

This article reports the coupling of a building energy simulation (BES) made with TRNSYS with a computational fluid dynamics (CFD) simulation made with ANSYS FLUENT and its application to a typical ... [more ▼]

This article reports the coupling of a building energy simulation (BES) made with TRNSYS with a computational fluid dynamics (CFD) simulation made with ANSYS FLUENT and its application to a typical Belgian two-storey house. The coupling scheme developed in this study aims to improve the overheating prediction for buildings. This phenomenon is becoming increasingly frequent in Northern Europe due to increased insulation and a lack of sun protection and natural cooling strategies. Complementary contributions of the two numerical approaches are underlined and used to obtain accurate results in an acceptable computing time, even in a thermally stratified room. The space and time coupling is discussed to obtain an optimised tool in which BES is in charge of the primary portion of the effort, while CFD intervenes punctually on one room of interest. The numerical results are compared both qualitatively and quantitatively to the experimental results, and the improved accuracy of the coupled tool compared with a standalone BES is underlined. [less ▲]

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See detailA validation process for CFD use in building physics – study of contaminant dispersion.
Barbason, Mathieu ULg; Reiter, Sigrid ULg

in Proceedings of the 5th international conference on advanced computational methods in engineering (2011, November)

Growing interests in environmental concerns oblige building engineers to develop new approaches and to get used to new skills. Among them, Computational Fluid Dynamics (CFD) holds more and more importance ... [more ▼]

Growing interests in environmental concerns oblige building engineers to develop new approaches and to get used to new skills. Among them, Computational Fluid Dynamics (CFD) holds more and more importance. This technique can help to improve the comfort of the occupants but also to predict very early building energy performance. Moreover, it is possible to study the quality of the air. This last point will greatly help building engineers to improve sanitary conditions in various cases such as hospitals, clean rooms or even in classical buildings. However, this approach is still new and need to be validated. Indeed, CFD is still new in the frame of building physics. This paper aims to prove the ability of CFD to predict accurately contaminant dispersion and to demonstrate the breakthroughs that CFD can bring in the near future. [less ▲]

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See detailCoupling approach in building physics.
Barbason, Mathieu ULg; Reiter, Sigrid ULg

Conference (2011, November)

CFD and Multizone Simulations can be coupled to improve their performance. This presentation tackles the possibilities of this technique and its difficulties.

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See detailA method to compare computational fluid dynamics (CFD) and multizonal dynamics simulations in buildings physics
Deltour, Jade; Van Moeseke, Geoffrey; Barbason, Mathieu ULg et al

in Proceedings of the International Conference CISBAT 2011 - Clean Tech for sustainable buildings - From Nano to Urban scale (2011, September 15)

This paper focuses on the development of a new evaluation method that combines data obtained by two different approaches: “multizonal dynamics” and “computational fluid dynamics (CFD)”. This research is a ... [more ▼]

This paper focuses on the development of a new evaluation method that combines data obtained by two different approaches: “multizonal dynamics” and “computational fluid dynamics (CFD)”. This research is a part of a project whose the main objective is to define guidelines for architects and buildings engineers. This guidelines aims at determining the adequate approach needed to evaluate the occupant thermal comfort and the building energy consumption for cooling and heating. [less ▲]

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See detailA validation process for CFD use in building physics – Study of the different length scales
Barbason, Mathieu ULg; Reiter, Sigrid ULg

in Proceedings of ROOMVENT 2011 (2011, June)

Due to growing environmental concerns, Computational Fluid Dynamics (CFD) is more and more used in building physics. Until today, the research community has validated separately several cases but there is ... [more ▼]

Due to growing environmental concerns, Computational Fluid Dynamics (CFD) is more and more used in building physics. Until today, the research community has validated separately several cases but there is no global validation process for this method. The aim of this paper is to provide a way for new users to develop and improve their CFD skills. This paper deals with the different geometry scales involved in building physics. Experimental results are available and will assess the ability of CFD to predict accurately the thermal behaviour of buildings. Thanks to this validation process, building engineers and architects can improve their simulations results and their understanding of the physical phenomena in building physics. [less ▲]

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See detailValidation of the Large Eddy Simulation model in building
Barbason, Mathieu ULg; Reiter, Sigrid ULg

in Proceedings of the 8th Conference on System Simulation in Buildings (2010, December)

Environmental concerns and growing computer resources have promoted the emergence of new simulation tools and especially Computational Fluid Dynamics (CFD). Turbulence modelling is a key for a good ... [more ▼]

Environmental concerns and growing computer resources have promoted the emergence of new simulation tools and especially Computational Fluid Dynamics (CFD). Turbulence modelling is a key for a good simulation. Unfortunately, models are numerous: Reynolds-Averaged Navier-Stokes (RANS), Detached Eddy Simulation (DES), Large Eddy Simulation (LES), etc. Moreover, there are lots of physical phenomena involved in building physics. Consequently, it is often difficult for a non-expert user to choose efficiently their models. This paper describes results obtained with LES for three different cases. These cases were retained to represent the most common situations encounter in building physics. Results are good and so the use of LES is validated for building physics simulations. RANS and DES results are also introduced to have a global view of the capacity of CFD simulations. RANS results are sufficient for the most current applications in building physics. But LES and DES can improve the results and give complementary data. [less ▲]

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See detailA validation process for CFD use in building physics.
Barbason, Mathieu ULg; van Moeseke, Geoffrey; Reiter, Sigrid ULg

in Proceedings of the 7th conference on Indoor Air Quality, Ventilation and Energy Conservation in buildings (2010)

Due to growing interests in environmental and building energy performance concerns, building physics simulations - and especially Computational Fluid Dynamics (CFD) – are more and more used. Unfortunately ... [more ▼]

Due to growing interests in environmental and building energy performance concerns, building physics simulations - and especially Computational Fluid Dynamics (CFD) – are more and more used. Unfortunately, until now, there is no clearly defined method to validate the use of these models by building engineers. This paper describes a validation process of CFD tools dealing with physical phenomena occurring in building physics. The comparison between experimental data and numerical results proves the validity of CFD use and its specific contribution to building physics modelling in comparison with thermal multizonal models. Thanks to this validation process, building engineers can improve their CFD simulations performance and their comprehension of building physics. [less ▲]

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See detailAbout the choice of a turbulence model in building physics simulations
Barbason, Mathieu ULg; Reiter, Sigrid ULg

in Proceedings of the 7th conference on Indoor Air Quality, Ventilation and Energy Conservation in buildings (2010)

Environmental concerns and growing computer resources have promoted the emergence of new simulation tools and especially Computational Fluid Dynamics (CFD). A lot of academic studies have proved the ... [more ▼]

Environmental concerns and growing computer resources have promoted the emergence of new simulation tools and especially Computational Fluid Dynamics (CFD). A lot of academic studies have proved the interest of this approach. Unfortunately, for non-expert users, it is sometimes difficult to deal with turbulence modelling. Indeed, in this area, conclusions of previous studies are very fickle and sometimes contradictory. This paper aims to evaluate the impact of the turbulence modelling with different Reynolds-Average Navier-Stokes (RANS) techniques applied to airflows inside buildings. It appears that differences are often very small and completely insignificant at the design stage. However, when numerical resources requirements and computing time are considered, important differences appear in favour of the simplest model. [less ▲]

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See detailAnalysis of dynamic response of a very flexible Delta wing model in a wind tunnel
Barbason, Mathieu ULg; Andrianne, Thomas ULg; Hickey, Daryl ULg et al

in Proceedings of the 2009 International Forum on Aeroelasticity and Structural Dynamics (2009, July)

Limit cycle oscillations involving Delta wings are an important area of research in modern aeroelasticity. Such phenomena can be the result of geometric nonlin- earity, aerodynamic nonlinearity or under ... [more ▼]

Limit cycle oscillations involving Delta wings are an important area of research in modern aeroelasticity. Such phenomena can be the result of geometric nonlin- earity, aerodynamic nonlinearity or under-wing store nonlinearity. In this paper, a flexible half-Delta wing without stores is tested in a low speed wind tunnel in order to investigate its dynamic response. It is found that, at several combinations of airspeed and angle of attack, the wing undergoes high amplitude limit cycle oscillations. Three types of such oscillations are observed. Type 1 oscillations occur only at low angles of attack and are the result of a Hopf-type bifurcation. Type 2 limit cycle oscillations occur at intermedi- ate angles of attack and are the result of an atypical bifurcation. In other words, these oscillations appear as the airspeed is increased but disappear at even higher airspeeds. Type 3 oscillations occur at even higher angles of attack. A bispectrum analysis shows that type 3 limit cycle oscillations feature quadratic phase coupling. No such coupling was measured for type 2 oscillations, leading to the conclusion that the nonlinearity must be of higher order. [less ▲]

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