期刊
COMPUTERS & FLUIDS
卷 190, 期 -, 页码 382-397出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2019.06.020
关键词
Adaptive strategy; Reduced basis methods; Proper orthogonal decomposition; Dynamic mode decomposition; Flow reconstruction; Impulsive start
资金
- EPSRC [EP/K000586/1]
- EPSRC [EP/K000586/1] Funding Source: UKRI
A local adaptive Reduced Basis approach is presented with a focus on the accuracy in reconstructing unsteady vortex-dominated flow fields generated by impulsively started lifting surfaces and bodies. The adaptive approach is built on the combination of methods based on Proper Orthogonal Decomposition, Spectral Orthogonal Decomposition, Dynamic Mode Decomposition and Recursive Dynamic Mode Decomposition and aims at making possible to explicitly take into account the temporal correlation between available snapshots of the problem. The latter has proven to be a critical element when building a Reduced Model for complex non-periodic and nonlinear unsteady flows. For a given instant of time in which the reconstruction is needed, the most accurate Reduced Model is automatically selected on the basis of an estimation of the error of the various methods in reconstructing the entire flow field. The impulsive start of a 2D symmetric airfoil, which evolves towards a periodic limit cycle, and the impulsive start of a three element airfoil and a 3D wing in high-lift configurations will be considered as demonstration cases. (C) 2019 Elsevier Ltd. All rights reserved.
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