Persona: Español Garrigos, José
Cargando...
Dirección de correo electrónico
ORCID
0000-0001-5263-2817
Fecha de nacimiento
Proyectos de investigación
Unidades organizativas
Puesto de trabajo
Apellidos
Español Garrigos
Nombre de pila
José
Nombre
4 resultados
Resultados de la búsqueda
Mostrando 1 - 4 de 4
Publicación Microscopic Slip Boundary Conditions in Unsteady Fluid Flows(American Physical Society, 2019-12-31) Torre, J. A. de la; Duque Zumajo, Diego; Camargo-Trillos, Diego; Español Garrigos, JoséAn algebraic tail in the Green-Kubo integral for the solid-fluid friction coefficient hampers its use in the determination of the slip length. A simple theory for discrete nonlocal hydrodynamics near parallel solid walls with extended friction forces is given. We explain the origin of the algebraic tail and give a solution of the plateau problem in the Green-Kubo expressions. We derive the slip boundary condition with a microscopic expression for the slip length and the hydrodynamic wall position, and assess it through simulations of an unsteady plug flow.Publicación Solution to the plateau problem in the Green-Kubo formula(American Physical Society, 2019-02-19) Torre, J. A. de la; Duque Zumajo, Diego; Español Garrigos, JoséTransport coefficients appearing in Markovian dynamic equations for coarse-grained variables have microscopic expressions given by Green-Kubo formulas. These formulas may suffer from the well-known plateau problem. The problem arises because the Green-Kubo running integrals decay as the correlation of the coarse-grained variables themselves. The usual solution is to resort to an extreme timescale separation, for which the plateau problem is minor. Within the context of Mori projection operator formulation, we offer an alternative expression for the transport coefficients that is given by a corrected Green-Kubo expression that has no plateau problem by construction. The only assumption is that the Markovian approximation is valid in such a way that transport coefficients can be defined, even in the case that the separation of timescales is not extreme.Publicación Microscopic Slip Boundary Conditions in Unsteady Fluid Flows(American Physical Society, 2019-12-31) Torre, J. A. de la; Duque Zumajo, Diego; Camargo-Trillos, Diego; Español Garrigos, JoséAn algebraic tail in the Green-Kubo integral for the solid-fluid friction coefficient hampers its use in the determination of the slip length. A simple theory for discrete nonlocal hydrodynamics near parallel solid walls with extended friction forces is given. We explain the origin of the algebraic tail and give a solution of the plateau problem in the Green-Kubo expressions. We derive the slip boundary condition with a microscopic expression for the slip length and the hydrodynamic wall position, and assess it through simulations of an unsteady plug flow.Publicación Solution to the plateau problem in the Green-Kubo formula(American Physical Society, 2019-02-19) Torre, J. A. de la; Duque Zumajo, Diego; Español Garrigos, JoséTransport coefficients appearing in Markovian dynamic equations for coarse-grained variables have microscopic expressions given by Green-Kubo formulas. These formulas may suffer from the well-known plateau problem. The problem arises because the Green-Kubo running integrals decay as the correlation of the coarse-grained variables themselves. The usual solution is to resort to an extreme timescale separation, for which the plateau problem is minor. Within the context of Mori projection operator formulation, we offer an alternative expression for the transport coefficients that is given by a corrected Green-Kubo expression that has no plateau problem by construction. The only assumption is that the Markovian approximation is valid in such a way that transport coefficients can be defined, even in the case that the separation of timescales is not extreme.