Finite element methods in wind engineering

Hughes, Thomas J.R.; Jansen, Kenneth E.

doi:10.1016/0167-6105(93)90296-z

Cited by 7 publications

(2 citation statements)

References 85 publications

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“…In particular, the partial differential equations ruling the system were discretised in terms of finite differences and solved in a given number of points of a grid overlapped to the geometrical domain. The discretisation approach adopted for the air distribution analysis was that of the finite element method [56].…”

Section: Computational Modelsmentioning

confidence: 99%

Ancient Use of Natural Geothermal Resources: Analysis of Natural Cooling of 16th Century Villas in Costozza (Italy) as a Reference for Modern Buildings

Ferrucci

Peron

2018

Sustainability

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The geothermal cooling system of six 16th century villas in Costozza (Vicenza, Italy) is analysed and modelled using computational fluid dynamics and referring to in-field monitoring data. The system passively cools the villas in summertime by means of underground ducts connected to the caves present in the nearby hills. It still perfectly works in Villa Aeolia, which is analysed here in more detail. The outcomes permit us to better understand the functioning conditions and to improve the conservation of the villas as a whole. Furthermore, the ancient cooling system can be used as a reference for how geothermal renewable resources can be used to improve indoor comfort and limit energy consumption in modern buildings in a temperate climate. A macroscopic analysis of the global airflow system as well as a detailed analysis of Villa Aeolia are developed. All results are validated with analytical methods, numerical methods, and with past experimental records. The system can provide fresh airflow rates that cool the walls of the room and maintain the temperature below 20 ° C even on hot summer days. An advantage is that the system works in a self-adaptive way, the airflow increases when the outdoor temperature increases. This self-adjustment allows us to compare the cooling system to a modern environmental control system.

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Section: Computational Modelsmentioning

confidence: 99%

Ancient Use of Natural Geothermal Resources: Analysis of Natural Cooling of 16th Century Villas in Costozza (Italy) as a Reference for Modern Buildings

Ferrucci

Peron

2018

Sustainability

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“…Theoretically, these damper can be chosen and the method is very effective for both acoustic-and elastic-wave modelling. physical quantities can be calculated via the Green's function by implementing simple multiplication in the frequency Considering the merits of the damping method and the finite-element method (Marfurt 1984;Hughes 1987; Seró n et al domain. Thus, the Green's function is a basic and important quantity for seismic modelling and inversion.…”

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confidence: 99%

A damping method for the computation of the 2.5-D Green's function for arbitrary acoustic media

Zhou

Greenhalgh

1998

Geophys. J. Int.

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SUMMARYIn acoustic wavefield modelling, the 2.5-D approximation, in which the model parameter is considered to be invariant in the strike direction and the source is assumed to be a point excitation so that the wavefield has 3-D features, is an economical and realistic scheme for seismic full-waveform inversion. On the other hand, according to Parseval's theorem, the least-squares inversion of time-domain seismic data is equivalent to that carried out with frequency-domain data, but the latter has some advantages such as its efficiency and flexibility in non-linear waveform (or diffraction) inversion with singleor multiple-frequency crosshole data. These inverse techniques require the computation of the response of a specified source and the Fréchet derivatives in the frequency domain, both of which can be calculated via the Green's function.In this paper, a damping method was applied to the computation of the 2.5-D Green's function for arbitrary acoustic media in the wavenumber-frequency domain. The 2.5-D acoustic and time-damped wave equation was solved with the finite-element method (FEM). The computations for homogeneous and heterogeneous media were performed in the frequency range 100-300 Hz. It was found that the time damper is important to the solution. A linear damper, as in time-domain modelling, can be chosen, but it depends on the frequency, the wavenumber and the width of the absorbing zone in the wavenumber-frequency-domain modelling. An appropriate time damper and a reasonable number of k y samples can be determined in terms of the range of frequency and the critical values of the wavenumber of the media. By comparing the numerical solutions with the exact analytic solution for the homogeneous case and the semi-analytic solution for two semi-infinite media in contact, it is shown that the method can yield satisfactory solutions in the frequency domain and the time domain. Finally, a synthetic experiment of crosshole seismic full-waveform inversion is used to illustrate the method.

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A two-step computational method for the analysis of vortex-induced oscillation of the bridge

Lee

2000

KSCE Journal of Civil Engineering

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Finite element methods in wind engineering

Cited by 7 publications

References 85 publications

Ancient Use of Natural Geothermal Resources: Analysis of Natural Cooling of 16th Century Villas in Costozza (Italy) as a Reference for Modern Buildings

Ancient Use of Natural Geothermal Resources: Analysis of Natural Cooling of 16th Century Villas in Costozza (Italy) as a Reference for Modern Buildings

A damping method for the computation of the 2.5-D Green's function for arbitrary acoustic media

A two-step computational method for the analysis of vortex-induced oscillation of the bridge

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