Piero Lanucara

Piero Lanucara
Cineca · Roma

About

32
Publications
4,129
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374
Citations

Publications

Publications (32)
Article
Full-text available
Tsunamis constitute a significant hazard for European coastal populations, and the impact of tsunami events worldwide can extend well beyond the coastal regions directly affected. Understanding the complex mechanisms of tsunami generation, propagation, and inundation, as well as managing the tsunami risk, requires multidisciplinary research and inf...
Article
Full-text available
In seismically active regions with variable dominant focal mechanisms, there is considerable tsunami inundation height uncertainty. Basic earthquake source parameters such as dip, strike, and rake affect significantly the tsunamigenic potential and the tsunami directivity. Tsunami inundation is also sensitive to other properties such as bottom fric...
Article
Full-text available
Probabilistic Tsunami Hazard Analysis (PTHA) quantifies the probability of exceeding a specified inundation intensity at a given location within a given time interval. PTHA provides scientific guidance for tsunami risk analysis and risk management, including coastal planning and early warning. Explicit computation of site-specific PTHA, with an ade...
Conference Paper
High-performance computing (HPC) is recognized as one of the pillars for further progress in science, industry, medicine, and education. Current HPC systems are being developed to overcome emerging architectural challenges in order to reach Exascale level of performance, projected for the year 2020. The much larger embedded and mobile market allows...
Article
Full-text available
The 2011 Tohoku earthquake (Mw = 9.1) highlighted previously unobserved features for megathrust events, such as the large slip in a relatively limited area and the shallow rupture propagation. We use a Finite Element Model (FEM), taking into account the 3D geometrical and structural complexities up to the trench zone, and perform a joint inversion...
Article
Full-text available
The coupling of a suite of meteorological limited area models with a wave prediction system based on the nesting of different wave models provides for medium-range sea state forecasts at the Mediterranean, regional and coastal scale. The new system has been operational at ISPRA since September 2012, after the upgrade of both the meteorological BOLA...
Article
Full-text available
El transformar un software secuencial en uno paralelo, es costoso y difícil, lo cual constituye solo dos de los muchos obstáculos técnicos y económicos que se tienen que enfrentar cuando se desea hacer uso de sistemas HPC. En este trabajo investigamos la posibilidad de mejorar de forma rápida y eficiente el desempeño de un código numérico secuencia...
Article
The expensive reengineering of the sequential software and the difficult parallel programming are two of the many technical and economic obstacles to the wide use of HPC. We investigate the chance to improve in a rapid way the performance of a numerical serial code for the simulation of the transport of a charged carriers in a Double-Gate MOSFET. W...
Article
AbstractIn this paper we show some applications of Advanced and Parallel Computing to the study of mathematical models in Systems Biology and in particular of the network of biochemical reactions occurring inside a cell. Due to their high complexity, the numerical study of these systems must be approached by means of sophisticated Advanced Computin...
Article
Forced and natural variability of modelled and observed Atlantic Ocean temperature and Atlantic Meridional Overturning Circulation (AMOC) is studied. In the observations and in a forced climate model run, we find increasing temperature at 1000 in in the Atlantic (20N). SVD analysis shows that;, for both model data and observations, a high index of...
Article
DOIT (Data Optimization Integrated Tool) is an ongoing project to develop a tool to perform inversions of deformation data by global optimization running on a commodity supercomputer. Its main task is to facilitate the user about the interpretation of deformation data (GPS, InSAR, leveling, etc.) due to different geophysical sources such as seismic...
Article
Monte Carlo as well as quasi-Monte Carlo methods are used to generate only few interfacial values in two-dimensional domains where boundary-value elliptic problems are formulated. This allows for a domain decomposition of the domain. A continuous approximation of the solution is obtained interpolating on such interfaces, and then used as boundary d...
Article
This paper deals with elastic wave propagation in 2D heterogeneous and dissipative media with complex layer interfaces and irregular topography. The initial boundary value problem which represents the elastic dynamics driving 2D elastic wave propagation is presented in displacement formulation. The discretization scheme is based on finite elements...
Article
Full-text available
A three-dimensional sigma coordinate free-surface high-performance model is used to investigate the flow regimes within the Strait of Gibraltar. High performances are achieved through a directive-based, MPI-like, parallelization of the code, obtained using SMS tool. The model makes use of a coastal-following, curvilinear orthogonal grid, that inclu...
Article
Full-text available
Domain decomposition of two-dimensional domains on which boundary-value elliptic problems are formulated is accomplished by probabilistic (Monte Carlo) as well as by quasi-Monte Carlo methods, generating only a few interfacial values and interpolating on them. Continuous approximations for the trace of solution are thus obtained, to be used as boun...
Article
We investigate a faster and easier way to parallelize seismological codes able to simulate the dynamical interaction between seismic radiation and near-surface geological structures. Shared and distributed memory techniques are investigated, results on speed-up and efficiency are shown and compared as well. We also show how a successful porting...
Article
We investigate a faster and easier way to parallelise seismological codes able to simulate the dynamical interaction between seismic radiation and near-surface geological structures. This is important in assessing strong ground motion, in the mitigation of seismic hazard and for studies concerning site effects. Our chosen case study is representati...
Article
We present a parallel implementation, on distributed shared memory architectures of two Conjugate--Gradients algorithms: the CGS and the BiCGSTAB methods associated with some algebraic preconditioners.
Article
Full-text available
A technique to make computer animations representing the propagation of antiplane shear waves in heterogeneous dissipative media is presented. The aim is to develop a useful tool to better investigate the physics of site effects in the 2D approximation. We apply this technique to real case studies that were the subject of previous papers. For each...
Article
Full-text available
We present a parallel implementation, on distributed shared memory architectures of two Conjugate-Gradients algorithms: the CGS and the BiCGSTABmethods associated with some algebraic preconditioners. We analyze the programming environment supplied by an SMP cluster of Digital Al- phaServer . We take into account two different imple- mentations of t...
Article
Full-text available
In this paper we apply a domain decomposition technique to construct an approximation scheme for the Isaacs equation in R n . The algorithm is presented for a 2-domain decomposition and some hints are given for the case of d subdomains having crossing points. The parallel algorithm is proved to have the same fixed point of the serial algorithm so t...
Article
We discuss the parallel implemention of some algorithms for Hamilton-Jacobi equations based on dynamic programming. Our model problem is the first order partial differential equation related to the isotropic motion of fronts in the normal direction with velocity c(x). We present a local version of the serial algorithm which is well suited for the p...
Article
We deal with some parallel algorithms for the numerical approximation of the front propagation problem. The model describe an interface moving in the normal direction with velocity c(x) ? 0. I. THEORY Our model is based on the so called "level set" formulation (see e.g. [B], [OS], [ES1], [ES2]) and requires the numerical solution of the first-order...
Article
Using domain decomposition techniques we construct an approximation scheme for Hamilton-Jacobi-Bellman equations in n. The algorithm is presented for a two-domain decomposition where the original problem is splitted into two problems with state constraints plus a linking condition. We establish the convergence to the viscosity solution and discuss...
Article
We apply a domain decomposition technique with subdomains without overlapping to construct an approximation scheme for Bellman equations in ℝ n . The algorithm is presented for a 2-domain decomposition where the original problem is split into two problems with state constraints plus a linking condition on the interface. We establish the convergence...

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Projects (2)
Project
pre-exascale, solid earth, HPC