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NUMERICAL　SIMULATION　OF　THE　EFFECT　OF　FILLET　FORMS　ON　APPENDAGE－BODY　junction　flow

Journal of Hydrodynamics 1994年第4期6卷 60-73页

作者： Li Ding Zhou Lian-di (China Ship Scientific Research Center P. O. Box 116, Wuxi Jiangsu 214082, P. R. China)

The possibility of using a fillet form to control the horseshoe vortex flow caused by the turbulent shear flow around wing-body junction has been investigated numerically. A numerical method for the solution of three dimensional incompressible, Reynolds-averaged Navier-Stokes equations with the two-equation (k, ε) turbulence model has been developed to evaluate the effect of fillet forms on appendage-body junction vortex flow. The wing investigated is NACA0020. The Reynolds number based on a chordlength is 1. 0 ×105. Three configurations including a baseline, a triangle fillet form, and a constant radius convex arc fillet form along the entire wing/flat-plate junction are presented. It is shown that a suitable convex filet form can significantly improve the stability of junction horseshoe vortex and reduce the strength of vortex and the non-uniformity in the wake velocity profile. It is also demonstrated the capability of the numerical approach in the design of vortex flow control devices.

关键词： fillet form junction flow horseshoe vortex numerical simulation.

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Numerical Simulation of Open-Channel flow in 90-Degree Combining junction

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Tsinghua Science and Technology 2003年第6期8卷 713-718页

作者：武蓉茅泽育 Department of Hydraulic and Hydropower Engineering Tsinghua University

Combining flows often occur in open channel networks of drainage systems and river engineering. Open-channel junction flows were analyzed by solving the depth-averaged two-dimensional, elliptic Reynolds-averaged Navier-Stokes equations with the Hanjalic-Launder (H-L) modification to the k-ε turbulence model without the free surface “rigid lid” approximation with an efficient finite-volume procedure. The model can also analyze flows with separation. The model was used to analyze the relative importance of various factors and was compared with laboratory measurements. The H-L modification produced much better simulations of the separation zone size with 20% better accuracy than the standard k-ε model. The H-L modification was then used to study the characteristic of junction flows and the separation zones with different discharge ratios. The simulational results show that separation zone size decreases as the discharge ratio of the upstream main channel to the downstream channel increases.

关键词： open-channel junction junction flow k-ε turbulence model Hanjalic-Launder (H-L) model

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