Efficient dynamic mode decomposition on moving mesh

​Amith Basavapatna Shesh and Hari Abram present a 15 credit project work titled "Efficient dynamic mode decomposition on moving mesh".
Students: Amith Basavapatna Shesh and Hari Abram

Supervisor: Saeed Salehi

Examiner: Håkan Nilsson
​The presentation online in Zoom.

Abstract​

Dynamic Mode Decomposition (DMD) is applied on a two-dimensional setup, for a transversely oscillating cylinder moving perpendicular to the free stream. The results obtained from the vortex shedding simulations of a stationary and transversely oscillating cylinder are benchmarked against literature [1][3], the simulation on which DMD is preformed is simulated at Reynolds number Re = 200, the cylinder is oscillating at frequency f = 0.14 and Amplitude A = 0.5. DMD is used to capture the coherent modes and their corresponding frequencies present in the flow. The DMD code developed is validated with literature [2]. The results from the moving mesh are interpolated to a background mesh that is stationary, DMD is performed on the data that is interpolated onto the background mesh at every time-step. After the application of DMD, it is observed that the dominant frequencies present in the flow are captured. This study serves as a proof-of-concept study for application of DMD on a non-stationary mesh.

References
1. Wake state and energy transitions of an oscillating cylinder at low Reynolds number - J. S. Leontini, B. E. Stewart, M. C. Thompson, K. Hourigan, et al.
2. The identification of coherent structures using proper orthogonal decomposition and dynamic mode decomposition - Qingshan Zhang, Yingzheng Liu, Shaofei Wang
3. Numerical predictions of low Reynolds number flows over two tandem circular cylinders - B. Sharman, F. S. Lien, L. Davidson and C. Norberg
4. Dynamic mode decomposition based analysis of flow past a transversely oscillating cylinder - Huan Ping, Hongbo Zhu, Kai Zhang, Dai Zhou, Yan Bao, Yuwang Xu, Zhaolong Han​
Category Student project presentation
Location: Navier, meeting room, Hörsalsvägen 7A, M-huset. Or online in Zoom.
Starts: 17 January, 2022, 13:00
Ends: 17 January, 2022, 14:00

Page manager Published: Mon 03 Jan 2022.