Selection of quasi-stationary states in the Navier-Stokes equation on the torus
MetadataShow full item record
Citation (published version)Margaret Beck, Eric Cooper, Konstantinos Spiliopoulos. 2018. "Selection of quasi-stationary states in the Navier-Stokes equation on the torus." Nonlinearity, Volume 32, https://doi.org/10.1088/1361-6544/aae936
The two dimensional incompressible Navier–Stokes equation on 𝘋𝛿 := [0,2𝜋𝛿] × [0,2𝜋] with 𝛿 ≈ 1, periodic boundary conditions, and viscosity 0 < 𝑣 ≪ 1 is considered. Bars and dipoles, two explicitly given quasi-stationary states of the system, evolve on the time scale 𝒪(e‾ᵛᵗ) and have been shown to play a key role in its long-time evolution. Of particular interest is the role that δ plays in selecting which of these two states is observed. Recent numerical studies suggest that, after a transient period of rapid decay of the high Fourier modes, the bar state will be selected if 𝛿 ≠ 1, while the dipole will be selected if 𝛿 = 1. Our results support this claim and seek to mathematically formalize it. We consider the system in Fourier space, project it onto a center manifold consisting of the lowest eight Fourier modes, and use this as a model to study the selection of bars and dipoles. It is shown for this ODE model that the value of δ controls the behavior of the asymptotic ratio of the low modes, thus determining the likelihood of observing a bar state or dipole after an initial transient period. Moreover, in our model, for all 𝛿 ≈ 1, there is an initial time period in which the high modes decay at the rapid rate 𝒪(e‾ᵗ⧸ᵛ), while the low modes evolve at the slower 𝒪(e‾ᵛᵗ) rate. The results for the ODE model are proven using energy estimates and invariant manifolds and further supported by formal asymptotic expansions and numerics.
First author draft
Showing items related by title, author, creator and subject.
Kenett, Dror Y.; Huang, Xuqing; Vodenska, Irena; Havlin, Shlomo; Stanley, H. Eugene (ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD, 2015-04-03)The presence of significant cross-correlations between the synchronous time evolution of a pair of equity returns is a well-known empirical fact. The Pearson correlation is commonly used to indicate the level of similarity ...
Reznik, Ed; Kaper, Tasso J.; Segre, Daniel (AMER INST PHYSICS, 2013-03-01)The synthetic construction of intracellular circuits is frequently hindered by a poor knowledge of appropriate kinetics and precise rate parameters. Here, we use generalized modeling (GM) to study the dynamical behavior ...
Cell volume regulation in the proximal tubule of rat kidney proximal tubule cell volume regulation Edwards, Aurelie; Layton, Anita T. (SPRINGER, 2017-11-01)We developed a dynamic model of a rat proximal convoluted tubule cell in order to investigate cell volume regulation mechanisms in this nephron segment. We examined whether regulatory volume decrease (RVD), which follows ...