Coercivity and stability results for an extended Navier-Stokes system

Iyer, Gautam, Pego, Robert L and Zarnescu, Arghir (2012) Coercivity and stability results for an extended Navier-Stokes system. Journal of Mathematical Physics, 53. p. 115605. ISSN 0022-2488

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In this paper, we study a system of equations that is known to extend Navier-Stokes dynamics in a well-posed manner to velocity fields that are not necessarily divergence-free. Our aim is to contribute to an understanding of the role of divergence and pressure in developing energy estimates capable of both controlling the nonlinear terms, and being useful at the time-discrete level. We address questions of global existence and stability in bounded domains with no-slip boundary conditions. Through use of new H^1 coercivity estimates for the linear equations, we establish a number of global existence and stability results, including results for small divergence and a time-discrete scheme. We also prove global existence in 2D for any initial data, provided sufficient divergence damping is included.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Mathematics
Subjects: Q Science > QA Mathematics > QA0299 Analysis. Including analytical methods connected with physical problems
Depositing User: Arghir Zarnescu
Date Deposited: 07 Aug 2014 13:08
Last Modified: 07 Aug 2014 13:08
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