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Dive into the research topics where Alessandro Franci is active.

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Featured researches published by Alessandro Franci.


Numerical Simulations of Coupled problems in Engineering | 2014

A particle finite element method (PFEM) for coupled thermal analysis of quasi and fully incompressible flows and fluid-structure interaction problems

Eugenio Oñate; Alessandro Franci; Josep Maria Carbonell

We present a Lagrangian formulation for coupled thermal analysis of quasi and fully incompressible flows and fluid-structure interaction (FSI) problems that has excellent mass preservation features. The success of the formulation lays on a residual-based stabilized expression of the mass balance equation obtained using the Finite Calculus (FIC) method. The governing equations are discretized with the FEM using simplicial elements with equal linear interpolation for the velocities, the pressure and the temperature. The merits of the formulation in terms of reduced mass loss and overall accuracy are verified in the solution of 2D and 3D adiabatic and thermally-coupled quasi-incompressible free-surface flows and FSI problems using the Particle Finite Element Method (PFEM). Examples include the sloshing of water in a tank and the falling of a water sphere and a cylinder into a tank containing water.


Archive | 2017

Unified Stabilized Formulation for Quasi-incompressible Materials

Alessandro Franci

This chapter is devoted to the derivation and validation of the unified stabilized formulation for nearly-incompressible materials. Namely, the cases of quasi-incompressible Newtonian fluids and quasi-incompressible hypoelastic solids will be analyzed.


Archive | 2017

Coupled Thermal–Mechanical Formulation

Alessandro Franci

This chapter is devoted to the coupling of the Unified formulation with the heat transfer problem. The objective is to solve general problems involving fluids, solids or both of them which behavior is temperature-dependent and where the phase change of the materials is allowed.


Archive | 2017

Conclusions and Future Lines of Research

Alessandro Franci

The aim of this chapter is to summarize all the thesis’s work done highlighting its innovative points and main contributions. The thesis outcomes leave many open lines of research and future developments. The future lines of work are given in the last section of this chapter.


Archive | 2017

Velocity-Based Formulations for Compressible Materials

Alessandro Franci

In this chapter two velocity-based finite element formulations for compressible materials are presented, namely the Velocity (V) and the mixed Velocity–Pressure (VP) formulations. For both schemes the linear momentum equations are solved iteratively for the velocity increments. The linearization of the governing equations is performed without specifying any constitutive law. The aim of this chapter is to maintain as much as possible the generality of the algorithms, leaving the formulations open to different material models. It will be shown that the only requirement demanded to the constitutive laws is that the rate of stress must be linearly related with the rate of deformation.


Archive | 2017

Industrial Application: PFEM Analysis Model of NPP Severe Accident

Alessandro Franci

In this chapter the analysis of an industrial problem solved using the Unified formulation is presented. The project required the modeling of the damages in a pressure vessel structure caused by the dropping of a volume of corium at high temperature.


Archive | 2017

Unified Formulation for FSI Problems

Alessandro Franci

In the previous chapters the Unified formulation was used for solving the mechanics of fluids and solids separately. In this chapter it will be shown that the method is also suitable for solving fluid–structure interaction (FSI) problems. The algorithm for coupling the three solid formulations (the V, the VP and the VPS elements) with the mixed Velocity–Pressure FIC-stabilized formulation for Newtonian fluids is described. It will be shown that the proposed method gives the possibility to select the formulation for the solid depending on the problem to solve. The numerical results will be validated by comparing the solution of benchmark FSI problems with the results of the literature.


International Journal for Numerical Methods in Fluids | 2014

Lagrangian formulation for finite element analysis of quasi-incompressible fluids with reduced mass losses

Eugenio Oñate; Alessandro Franci; Josep Maria Carbonell


Computational Mechanics | 2014

A particle finite element method for analysis of industrial forming processes

Eugenio Oñate; Alessandro Franci; Josep Maria Carbonell


Computer Methods in Applied Mechanics and Engineering | 2016

Unified Lagrangian formulation for solid and fluid mechanics and FSI problems

Alessandro Franci; Eugenio Oñate; Josep Maria Carbonell

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Eugenio Oñate

Polytechnic University of Catalonia

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Josep Maria Carbonell

Polytechnic University of Catalonia

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M. Chiumenti

Polytechnic University of Catalonia

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Xue Zhang

University of Newcastle

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