Dynamic Mode Decomposition of Horseshoe Vortex Flow Structures Around Square PrismPlate Junctions

WANG Jianming; MING Xiaojie; WANG Han; MA Yang; WANG Chengjun

doi:10.21656/1000-0887.380125

Volume 39 Issue 1

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WANG Jianming, MING Xiaojie, WANG Han, MA Yang, WANG Chengjun. Dynamic Mode Decomposition of Horseshoe Vortex Flow Structures Around Square PrismPlate Junctions[J]. Applied Mathematics and Mechanics, 2018, 39(1): 64-76. doi: 10.21656/1000-0887.380125

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Dynamic Mode Decomposition of Horseshoe Vortex Flow Structures Around Square PrismPlate Junctions

doi: 10.21656/1000-0887.380125

Liaoning Key Lab of Advanced Measurement and Test Technology for Aircraft Propulsion Systems, Faculty of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, P.R.China

Funds: The National Natural Science Foundation of China（51476106）

Received Date: 2017-05-08
Rev Recd Date: 2017-05-15
Publish Date: 2018-01-15

Abstract

Abstract

The multi-frequency phenomenon exists with the horseshoe vortex flow structure in junction flow. In order to demonstrate the oscillatory characteristics and the basic dynamics, the periodical oscillatory horseshoe vortex system was simulated near the square prism-plate junction. The periodical oscillatory flow of the horseshoe vortex makes a multi-frequency phenomenon. Then the velocity field in the plane of symmetry was decomposed with the dynamic mode decomposition (DMD) method. The 1st 3 modes were reconstructed and superposed on the mean flow mode respectively, and their progressive evolutions were analyzed. The results show that all the modes reveal the merging of horseshoe vortices in different sizes, and develop in different styles.
- square prismplate junction,
- horseshoe vortex,
- periodical oscillatory flow,
- dynamic mode decomposition (DMD)

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References(23)

References

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