Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1034-1042.doi: 10.13229/j.cnki.jdxbgxb20180369

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Investigation of vortical structures in wake of Ahmed body by delayed detached⁃eddy simulation turbulence model using immersed boundary method

Xin CHEN(),Ming LI,Xin⁃jian RUAN,Ning WANG,Jia⁃ning WANG   

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
  • Received:2018-04-18 Online:2019-07-01 Published:2019-07-16

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Abstract:

A new solver is implemented based on immersed boundary method (IBM) and pressure implicit with splitting of operators (PISO) algorithm. By this IBM-PISO solver, the external flow of Ahmed body is simulated using the delayed detached-eddy (DDES) turbulence model. First, the time-averaged features and shedding frequency of 2D cylinder cases are used for the verification of the IBM module and IBM-PISO solver. Then the instantaneous flow field, time-averaged features, and vortical flow structures of Ahmed body are investigated. The effect of slant angle and the transport of vortical structures are compared. The results show that the IBM-PISO solver produces accurate results at separation zone and main vortical flow structures including recirculation vortices, horse-shoe vortices at the upper surface and at the foot of the front surface, C-pillar vortices, and lateral vortices. The transport in the wake enhances the turbulence of C-pillar vortices and renders their domination over the far-wake flow field. The effect of slant angle is based on controlling the flow separation at the slant and confined to the near-wake region.

Key words: vehicle engineering, immersed boundary method(IBM), delayed detached?eddy simulation (DDES) turbulence model, Ahmed body, vortical structures

CLC Number: 

  • U461.1

Fig.1

Time?averaged flow structure of cylinder at ReD = 30"

Table 1

Comparison of wake parameters at ReD =30"

L/D Lx/D Ly/D φ/(°)
当前算例 1.56 0.53 0.52 48.00
实验[13] 1.55 0.54 0.54 50.00
IBM仿真[14] 1.70 0.56 0.52 48.05

Fig.2

Instantaneous streamline pattern and vorticity contour in wake of cylinder at ReD = 185"

Fig.3

Ahmed vehicle model"

Fig.4

Computational domain for external flow field of Ahmed vehicle model"

Fig.5

Profiles for streamwise component of velocity(θ = 25°）"

Fig.6

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Fig.7

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Fig.8

Streamline patterns in YZ plane at rear of Ahmed body (θ = 25°)"

Fig.9

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