arXiv subjects

Ángel Giménez

Publications and source records attributed to Ángel Giménez.

5 recordsLinked to original sources

arXiv2026

On the Kneser property of the three-dimensional Navier-Stokes equations with damping

In this paper, we study the connectedness and compactness of the attainability set of weak solutions to the three-dimensional Navier--Stokes equations with damping. Depending on the value of the parameter \b{eta}, which controls the damping term, we establish these results with respect to either the weak or the strong topology of the phase space. In the latter case, we also prove that the global attractor is connected. Additionally, we establish results concerning the regularity of the global attractor and provide a new proof of its existence for strong solutions.

math.AP↗

arXiv2025

Attractors for weak and strong solutions of the three-dimensional Navier-Stokes equations with damping

In this paper we obtain the existence of global attractors for the dynamical systems generated by weak solution of the three-dimensional Navier-Stokes equations with damping. We consider two cases, depending on the values of the parameters \b{eta},α controlling the damping term and the viscosity μ. First, for \b{eta} we define a multivalued dynamical systems and prove the existence of the global attractor as well. Second, for either \b{eta}>3 or \b{eta}=3, 4αμ>1 the weak solutions are unique and we prove that the global attractor for the corresponding semigroup is more regular. Also, we prove in this case that it is the global attractor for the semigroup generated by the strong solutions. Finally, some numerical simulations are performed.

math.AP↗

arXiv2016

Integrability aspects of the vortex filament equation for pseudo-null curves

An algebraic background in order to study the integrability properties of pseudo-null curve motions in a $3$-dimensional Lorentzian space form is developed. As an application we delve into the relationship between the Burgers' equation and the pseudo-null vortex filament equation. A recursion operator for the pseudo-null vortex filament equation is also provided.

math-ph↗

arXiv2016

Null curve evolution in four-dimensional pseudo-Euclidean spaces

We define a Lie bracket on a certain set of local vector fields along a null curve in a 4-dimensional semi-Riemannian space form. This Lie bracket will be employed to study integrability properties of evolution equations for null curves in a pseudo-Euclidean space. In particular, a geometric recursion operator generating infinite many local symmetries for the null localized induction equation is provided.

math-ph↗

arXiv2014

A Lie algebra structure on variation vector fields along curves in $2$-dimensional space forms

A Lie algebra structure on variation vector fields along an immersed curve in a $2$-dimensional real space form is investigated. This Lie algebra particularized to plane curves is the cornerstone in order to define a Hamiltonian structure for plane curve motions. The Hamiltonian form and the integrability of the planar filament equation is finally discussed from this point of view.

math.DG↗