An Erosion Technique for Assessing Ground Level Winds

Borges, A.R. Janeiro; Saraiva, J. A. Gil

doi:10.1016/b978-1-4832-8367-8.50028-0

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…is the resuspension flux, u* is the shear velocity, and u* cr is the critical value above which resuspension occurs. The critical value was obtained from the studies of[4], who suggested, based on experimental studies: shows the balance of mass for the cell just above the bed, in a 3-D situation, used to calculate resuspension and deposition. a represents advectives fluxes a u c i ( ) = ⋅ , d represents diffusive fluxes f ress represents the resuspension flux, given by equation 13.…”

mentioning

confidence: 99%

Moving beds represented by immersed boundaries: numerical experiments using large eddy simulation

Filho

Schulz

Simões³

2012

Ingeniare. Rev. chil. ing.

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Se utilizó el método de fronteras inmersas para evaluar el transporte de sedimentos en lechos deformables. Los procedimientos de la simulacion de gran escalas fueron utilizados para el tratamiento matemático de la turbulencia, y se utilizó la ecuación de advección-difusión para calcular la concentración de sedimentos. Se aplicó el método de diferencias finitas con malla desplazada para la solución numérica de las ecuaciones básicas (Navier-Stokes filtrado, continuidad y las ecuaciones de advección-difusión). Las derivadas espaciales fueron discretizadas mediante diferencias de segundo orden centrado. Se utilizó un esquema explícito de Adams-Bashforth de segundo orden para la evolución del tiempo en la ecuación de adveccióndifusión, mientras que un esquema Adams-Bashforth de cuarto orden fue utilizado para las ecuaciones de Navier-Stokes filtrado. La simulación numérica reproduce estructuras de flujo, como los remolinos grandes después de las crestas de las dunas y los vórtices contrarrotativos, que son importantes en el transporte de sedimentos. Los flujos de resuspensión y sedimentación (dependientes de la concentración de partículas) se calcularon utilizando las ecuaciones propuestas en este estudio. Las deformaciones del lecho por la erosión y la deposición pueden ser bien seguidas a través de los procedimientos aqui presentados, que muestran que esta metodología es adecuada para evaluar las modificaciones del lecho y el transporte de sedimentos en los flujos aluviales. Palabras clave: Mecánica de fluidos computacional, método de fronteras inmersas, simulaciones de gran escala, transporte de sedimentos, lechos deformables.

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mentioning

confidence: 99%

Moving beds represented by immersed boundaries: numerical experiments using large eddy simulation

Filho

Schulz

Simões³

2012

Ingeniare. Rev. chil. ing.

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“…However, the viscosity of the incoming flow was increased by using an effective term in the numerical modelling. Since the study was concerned with the reverse-vortex flow which could aevelop between parallel buildings, only wind velocities were computed and compared with another study (Borges and Saraiva 1979) which measured the reverse wind velocity using sand erosion techniques. The wind speed ratios computed was also compared with the result of a wind-tunnel study (Penwarden and Wise 1973).…”

Section: Three-dimensional Workmentioning

confidence: 99%

Prediction of wind effects on buildings using computational methods — review of the state of the art

Baskaran¹,

Stathopoulos²

1994

Can. J. Civ. Eng.

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Engineering, 21, 5, pp. 805-822, 1994-10-01 Prediction of wind effects on buildings using computational methods : review of the state of the art Baskaran, B. A.; Stathopoulos, T. Advancements in computer software and hardware technology provide a new direction for analyzing engineering problems. Recently the field of wind engineering has gained significant momentum in the computer modelling process. This paper reviews the state of the art in computational wind engineering, including the finite element method, finite difference method, and control volume technique. A portion of this paper summarizes the research in this area carried out by the authors. Computations have been made for a variety of building configurations, including normal wind flow conditions for a building with different aspect ratios, and modelling wind environmental conditions around groups of buildings. The computer modelling technique may eventually enhance the design of buildings and structures against wind loading and supplement the current design practice of using building codes and standards or performing experiments in wind tunnels. Canadian Journal of CivilKey words: buildings, computer modelling, pressure, velocity, wind engineering, wind tunnels.Des progrks importants dans le dkveloppement des ordinateurs et des logiciels de modClisation ont Cte observCs dans le domaine de I'aCrodynamique et permettent de donner une nouvelle orientation a I'analyse des problkmes techniques. Cet article examine I'Ctat actuel de la technologie informatique dans ce domaine, y compris la mCthode des Clements finis, la methode des diffkrences finies et la technique du volume de contrble. Une partie de cet article rCsume la recherche effectuCe dans ce domaine par les auteurs. Des calculs ont Ct C effectuks pour une variCtC de configurations de biitiment, y compris des conditions normales d'Ccoulement du vent pour un biitiment ayant divers rapports de forme, et une modClisation des conditions environnementales autour de groupes de bgtiments a Cte rCaIisCe. La technique de modClisation informatique permettra eventuellement d'amCliorer la conception des biitiments et des structures en ce qui concerne les surcharges dues au vent. Elle constitue un complCment aux exigences contenues dans les codes et les normes du biitiment et aux essais en soufflerie.Mots cle's : b2timents, modClisation informatique, pression, vitesse, akrodynamique, souffleries.[Traduit par la rCdaction]Ca...

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“…As figuras de erosão são utilizadas para a visualização do campo de velocidade no nível do solo (JANEIRO BORGES et al, 1979;BERANEK, 1979).…”

Section: Prata Alessandra Rodriguesunclassified

“…Os ensaios experimentais foram realizados utilizando-se grãos de areia de 0.6mm e com granulometrias diferentes espalhadas em baixa concentração numa superfície de madeira compensada (JANEIRO BORGES, et al, 1979 A pressão medida na entrada frontal do tubo é designada pressão total (Pt) e a pressão medida nos orifícios laterais, chama-se pressão estática (Ps). Da diferença entre uma e outra, obtém-se a pressão dinâmica (Pd).…”

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Impacto da altura de edifícios nas condições de ventilação natural do meio urbano

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An Erosion Technique for Assessing Ground Level Winds

Cited by 9 publications

References 5 publications

Moving beds represented by immersed boundaries: numerical experiments using large eddy simulation

Moving beds represented by immersed boundaries: numerical experiments using large eddy simulation

Prediction of wind effects on buildings using computational methods — review of the state of the art

Impacto da altura de edifícios nas condições de ventilação natural do meio urbano

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