Numerical simulation of steady flow fields in a model of abdominal aorta with its peripheral branches

In a previous study by the authors, steady flow fields in a model of abdominal aorta with its seven peripheral branches were reported. In the present study, the some aorta model was simulated numerically with a pulsatile inlet waves for both the resting and exercise conditions. The baseline pulsatile flow field was presented in terms of velocity vectors and iso-velocity contours as well as the wall shear stress (WSS) distribution and the recirculation zones. The time-averaged behavior of the flow field represented by the fluid dynamic factors was discussed. The results were consistent with those obtained experimentally and numerically by other investigators. It was also found that under the present conditions, the steady flow behavior could adequately describe the time-averaged behavior of its corresponding pulsatile case, particularly in the regions where convective flow dominated. The present computer code may provide a platform for clinical simulations.

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Numerical Simulation of Muzzle Flow Field of Gun Based on CFD

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.1981 ◽

2013 ◽

Vol 291-294 ◽

pp. 1981-1984

Author(s):

Zhang Xia Guo ◽

Yu Tian Pan ◽

Yong Cun Wang ◽

Hai Yan Zhang

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Stokes Equation ◽

Wave Structure ◽

Flow Fields ◽

Single Equation ◽

Navier Stokes ◽

Turbulent Model ◽

Navier Stokes Equation ◽

Numerical Simulation Result

Gunpowder was released in an instant when the pill fly out of the shell during the firing, and then formed a complicated flow fields about the muzzle when the gas expanded sharply. Using the 2 d axisymmetric Navier-Stokes equation combined with single equation turbulent model to conduct the numerical simulation of the process of gunpowder gass evacuating out of the shell without muzzle regardless of the pill’s movement. The numerical simulation result was identical with the experimental. Then simulated the evacuating process of gunpowder gass of an artillery with muzzle brake. The result showed complicated wave structure of the flow fields with the muzzle brake and analysed the influence of muzzle brake to the gass flow field distribution.

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A Numerical Investigation on the Volute/Diffuser Interaction due to the Axial Distortion at Impeller Exit

10.1115/imece2000-1673 ◽

2000 ◽

Author(s):

Fahua Gu ◽

Abraham Engeda ◽

Mike Cave ◽

Jean-Luc Di Liberti

Keyword(s):

Experimental Data ◽

Numerical Simulation ◽

Numerical Investigation ◽

Steady Flow ◽

Centrifugal Compressor ◽

Vortex Structure ◽

Flow Model ◽

Single Stage ◽

Mass Flows

Abstract A numerical simulation is performed on a single stage centrifugal compressor using the commercially available CFD software, CFX-TASCflow. The steady flow is obtained by circumferentially averaging the exit fluxes of the impeller. Three runs are made at design condition and off-design conditions. The predicted performance is in agreement with experimental data. The flow details inside the stationary components are investigated, resulting in a flow model describing the volute/diffuser interaction at design and off-design conditions. The recirculation and twin vortex structure are found to explain the volute loss increase at lower and higher mass flows, respectively.

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