A Computational Study of a Data Assimilation Algorithm for the Two-dimensional Navier-Stokes Equations. (12th April 2016)

• Record Type: Journal Article
• Authors: Gesho, Masakazu; Olson, Eric; Titi, Edriss S.
• Is Part Of: Communications in computational physics. Volume 19:Number 4(2016:Apr.)
• Page Start: 1094
• Page End: 1110
• Publication Date: 2016-04-12
• Subjects: 35Q30, -- 93C20, -- 37C50, -- 76B75, -- 34D06; Continuous data assimilation, -- determining nodes, -- signal synchronization, -- two-dimensional Navier-Stokes equations, -- downscaling; Mathematical physics -- Data processing -- Periodicals; Physics -- Data processing -- Periodicals; 530.150285
• DOI: 10.4208/cicp.060515.161115a
• Languages: English
• ISSNs: 1815-2406

Abstract

Abstract: We study the numerical performance of a continuous data assimilation (downscaling) algorithm, based on ideas from feedback control theory, in the context of the two-dimensional incompressible Navier-Stokes equations. Our model problem is to recover an unknown reference solution, asymptotically in time, by using continuous-in-time coarse-mesh nodal-point observational measurements of the velocity field of this reference solution (subsampling), as might be measured by an array of weather vane anemometers. Our calculations show that the required nodal observation density is remarkably less than what is suggested by the analytical study; and is in fact comparable to the number of numerically determining Fourier modes, which was reported in an earlier computational study by the authors. Thus, this method is computationally efficient and performs far better than the analytical estimates suggest.