Wyniki wyszukiwania - BazTech

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Investigation of edge fairing shaping effects on aerodynamic response of long-span bridge deck by unsteady RANS

Haque M. N., Katsuchi H., Yamada H., Nishio M.

Archives of Civil and Mechanical Engineering

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2016

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Vol. 16, no. 4

888--900

EN

Triangular edge fairings are widely used and attached to the edges of rectangular box girder bridge decks to improve their aerodynamic responses. Bridge deck with edge fairing should be shaped efficiently to obtain optimum aerodynamic responses. In this paper, the shaping effect of a triangular edge fairing on aerodynamic behaviour of a bridge deck is presented. A wide range of top and bottom plate slopes is utilized to change the shape of the fairing. The unsteady RANS simulation with the k–ω-SST turbulence model is used to simulate the flow. The flow is discretized by the finite volume method with second-order accuracy in space and time. The mean and rms values of the force coefficients are evaluated and the after-body velocity fluctuations are plotted. The aerodynamic responses are tried to explain by means of pressure and velocity distributions around the bridge deck. A relative comparison of the aerodynamic responses of perforated and solid handrails is also presented. It is found that a lower aerodynamic response can be obtained by properly shaping the triangular edge fairing.

2

Niestacjonarne modelowanie fluktuacji przepływu dwufazowego ciecz-ciecz w mieszalniku statycznym typu Kenics

Jaworski Z., Murasiewicz H.

Inżynieria i Aparatura Chemiczna

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2009

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Nr 1

98-100

PL

Przedstawiono wyniki modelowania numerycznego przepływu burzliwego dwufazowego w mieszalniku statycznym Kenics. W badaniach CFD wykorzystano dwa podejścia: symulacji wielkowirowych LES z modelem Smagorimiky'ego-Lilly oraz metodę symulacji niestacjonarnych URANS z modelem k-e. Symulacje numeryczne przeprowadzono dla dwóch niemieszających się wzajemnie cieczy: wody i oleju silikonowego oraz dla liczby Re —W 000.

EN

Results of numerical modeling of two-phase turbulent flow in a static Kenics mixer are presented. The CFD simulations were carried out using two approaches: 1) large eddy simulation with the Smago-rinsky-Lilly model and 2) unsteady RANS method with the fe-c model. Water was used as the continuous phase whereas silicon oil formed the dispersed phase. The Reynolds number value was equal to 10000.

3

Unsteady flow simulation in hydraulic machinery

Ruprecht A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2002

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Vol. 6, No 1

187-208

EN

In the field of hydraulic machinery Computational Fluid Dynamics (CFD) is routinely used today in research and development as well as in the daily design phase. Today in industry mostly steady state simulations are applied. In this paper, however, an overview of unsteady simulations is shown for different applications. The presented examples contain problems with self excited unsteadiness, vortex rope in the draft tube, as well as applications with externally forced unsteadiness by changing or moving geometries and rotor-stator interactions. For the shown applications the requirements, potential and limitations of unsteady flow analysis are assessed.