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Yuz Eissmann, Juan Ignacio
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Nombre
Yuz Eissmann, Juan Ignacio
Departamento
Campus / Sede
Campus Casa Central Valparaíso
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Scopus Author ID
6508368901
Now showing 1 - 4 of 4
- PublicationDissipative port-Hamiltonian Formulation of Maxwell Viscoelastic Fluids(2021-01-01)
;Mora, Luis A. ;Le Gorrec, Yann; ; Maschke, BernhardIn this paper we consider general port-Hamiltonian formulations of multidimensional Maxwell’s viscoelastic fluids. Two different cases are considered to describe the energy fluxes in isentropic compressible and incompressible fluids. In the compressible case, the viscoelastic effects of shear and dilatational strains on the stress tensor are described individually through the corresponding constitutive equations. In the incompressible case, an approach based on the bulk modulus definition is proposed in order to obtain an appropriate characterization, from the port-Hamiltonian point of view, of the pressure and nonlinear terms in the momentum equation, associated with both dynamic pressure and vorticity of the flow. - PublicationOn port-Hamiltonian formulations of 3-dimensional compressible Newtonian fluids(2021-11-01)
;Mora, Luis A. ;Le Gorrec, Yann ;Matignon, Denis; In-flame optical characterization of soot is of vital importance to understand soot formation mechanisms as well as to develop and validate accurate soot models. The present work introduces an unconventional methodology adapted to laminar axisymmetric flames that avoids the issue of variable measurement volume with varying scattering angle in the existing light scattering techniques and thus enables the determination of aggregate size with a higher spatial resolution. Coupled with multi-wavelength line-of-sight attenuation measurements, the proposed Horizontal Planar Angular Light Scattering at 532 nm was found able to provide radial profiles of aggregate size, number and diameter of primary spheres, soot volume fraction, and number density in a laminar axisymmetric coflow ethylene/air diffusion flame established over a Gülder burner. The spatial variation of soot optical properties associated with soot maturity was considered in data analysis. - PublicationAbout dissipative and pseudo port-Hamiltonian formulations of irreversible Newtonian compressible flows(2020-01-01)
;Mora, Luis A. ;Le Gorrec, Yann ;Matignon, Denis ;Ramirez, HectorIn this paper we consider the physical-based modeling of 3D and 2D Newtonian fluids including thermal effects in order to cope with the first and second principles of thermodynamics. To describe the energy fluxes of non-isentropic fluids we propose a pseudo port-Hamiltonian formulation, which includes the rate of irreversible entropy creation by heat flux. For isentropic fluids, the conversion of kinetic energy into heat by viscous friction is considered as an energy dissipation associated with the rotation and compression of the fluid. Then, a dissipative port-Hamiltonian formulation is derived for this class of fluids. In the 2D case we modify the vorticity operators in order to preserve the structure of the proposed models. Moreover, we show that a description for inviscid or irrotational fluids can be derived from the proposed models under the corresponding assumptions leading to a pseudo or dissipative port-Hamiltonian structures.Scopus© Citations 7 - PublicationFluid-Structure Port-Hamiltonian Model for Incompressible Flows in Tubes with Time Varying Geometries(2020-01-01)
;Mora, Luis A. ;Yann, Le Gorrec ;Ramirez, HectorA simple and scalable finite-dimensional model based on the port-Hamiltonian framework is proposed to describe the fluid–structure interaction in tubes with time-varying geometries. For this purpose, the moving tube wall is described by a set of mass-spring-damper systems while the fluid is considered as a one-dimensional incompressible flow described by the average momentum dynamics in a set of incompressible flow sections. To couple these flow sections small compressible volumes are defined to describe the pressure between two adjacent fluid sections. The fluid-structure coupling is done through a power-preserving interconnection between velocities and forces. The resultant model includes external inputs for the fluid and inputs for external forces over the mechanical part that can be used for control or interconnection purposes. Numerical examples show the accordance of this simplified model with finite-element models reported in the literature.Scopus© Citations 5