# Rodrigo R PazANSYS Inc. - CONICET

Rodrigo R Paz

Professor, Scientist, PhD NumMethods, Aeron Eng

ICFD/FSI LS-DYNA Lead Scientist and Developer.
Corresponding (Honorary) Member of CONICET.

## About

83

Publications

36,098

Reads

**How we measure 'reads'**

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more

1,448

Citations

Introduction

Lead Senior Scientist at ANSYS Inc, California, USA.
Corresponding (Honorary) Research Member of CONICET.
Senior Scientist at Conicet (2001-Apr2017).
Professor at UNL (2001-Jan2017 ).

Additional affiliations

June 2018 - present

February 2013 - present

**Livermore Software Technology Corporation (LSTC)**

Position

- Senior Researcher

April 2002 - present

## Publications

Publications (83)

Photovoltaic modules are one of the intensively used technologies that provide a renewable energy alternative to electricity generation. Consequently, these devices have been studied using different approaches in order to determine their aerodynamic characteristics. Nevertheless, there is still a lack of guidelines from the codes of practice that c...

Plenary Talk at CAIM 2021.
Find the recorded talk with CC at: https://youtu.be/3OZUqXVoHr0

The main goal of this paper is to evaluate the performance of the PFEM-2 method in the field of biomedical devices comparing the predictions with experimental results.

In recent years the biomedical industry has shown increased interest in using numerical methods to assist in the R&D of medical devices. The long term goal is to reduce the costly and lengthy process that clinical trials take for the US Food and Drug Administration (FDA) to approve a medical device. For this reason both the FDA and academia are wor...

Computational Fluid Dynamics (CFD) is a powerful tool and has been applied on various problems. In the biomedical application, CFD has been applied not only on the simulations of blood flow and airflow in lungs, but also on the designs and analysis of the medical devices. This study focuses on two benchmark problems proposed by FDA for the standard...

Evteev and Heuzé (1) state that there is no evidence supporting that Chinese, Japanese and Korean populations exhibit cold-adaptation features. However, several facial traits present on these groups were previously interpreted as cold-climate adaptations (2-9). For instance, a composite sample including Chinese, Japanese and Korean individuals show...

Both modern humans (MHs) and Neanderthals successfully settled across western Eurasian cold-climate landscapes. Among the many adaptations considered as essential to survival in such landscapes, changes in the nasal morphology and/or function aimed to humidify and warm the air before it reaches the lungs are of key importance. Unfortunately, the la...

The interest in synthetic methods relies in the fact that reliability of methodologies such as large eddy simulations (LES) or direct numerical simulations strongly depends on how well the developed turbulence is characterized, which generally leads to computationally expensive simulations. Turbulence generation methods allow the initialization and...

El Grupo de Estudio en Mecánica Computacional (GEMeCo) del Departamento Mecánica de la Facultad Regional San Nicolás dependiente de la Universidad Tecnológica Nacional mediante convenio de cooperación mutua con la empresa “Tanques Fangio SA”, dedicada a la fabricación de vehículos de carga para el transporte de combustibles líquidos; tomó como obje...

LS-DYNA® is a general purpose explicit and implicit finite element program used to analyse the non-linear dynamic response of three-dimensional solids and fluids. It is developed by Livermore Software Technology Corporation (LSTC). A module to simulate incompressible flows has been added to LS-DYNA® for coupled fluid/mechanical/thermal simulations...

The optimization of computing methods along with the advance of construction technology of civil structures, allow nowadays to design and build lighter and low stiffness and damping structures, turning them into elements of high sensitivity against wind-induced dynamic effects. The purpose of this work is to describe and to apply a simple calculati...

This work is a first step in the understanding of the interaction process between internal shock waves and the flow transition inside of a rocket nozzle that develops during the engine start-up phase or when the nozzle is operated at over-expanded conditions. In many cases, this transition in the flow pattern produces side loads in the nozzle due t...

In the design of civil structures, it is necessary to consider the effect of the dynamic loads caused by changes in meteorological conditions such as wind speeds or ice deposits. In Argentina, the Standard of the Argentine Electrotechnical Association (AEA, 2006) is used to calculate structures of electrical transmission networks. This Standard spe...

In the present work an implementation of the Back and Forth Error Compensation and Correction (BFECC) algorithm specially suited for running on General-Purpose Graphics Processing Units (GPGPUs) through Nvidia’s Compute Unified Device Architecture (CUDA) is analyzed in order to solve transient pure advection equations. The objective is to compare i...

In the present work the problem of generating synthesized turbulence at inflow boundaries of the simulation domain is addressed in the context of the Large Eddy Simulation (LES) method. To represent adequately certain statistical properties of a turbulent process, we propose a synthesized turbulence method which is based on previous works (Huang et...

Electrophoresis is the motion of charged particles relative to the surrounding liquid under the influence of an external electric field. This electrochemical transport process is used in many scientific and technological areas to separate chemical species. Modeling and simulation of electrophoretic transport enables a better understanding of the ph...

Multidisciplinary and Multiphysics coupled problems represent nowadays a chal-lenging field when studying or analyzing even more complex phenomena that appear in nature and in new technologies (e.g. Magneto-Hydrodynamics, Micro-Electro-Mechanics, Thermo-Mechanics, Fluid-Structure Interaction, etc.). Particularly, when dealing with Fluid-Structure I...

In this paper we introduce and describe an efficient thread-safe matrix library for computing element/cell residuals and Jacobians in Finite Elements and Finite Volume-like codes. The library provides a wide range of multi-index tensor operations that are normally used in scientific numerical computations. The library implements an algorithm for ch...

In this article, a new methodology for developing discrete geometric conservation law (DGCL) compliant formulations is presented. It is carried out in the context of the finite element method for general advective–diffusive systems on moving domains using an ALE scheme. There is an extensive literature about the impact of DGCL compliance on the sta...

Over the last twenty years, computer simulation of incompressible fluid flow has been based on the Eulerian formulation of the fluid mechanics equations on continuous domains. However, it is still difficult to analyze problems in which the shape of the free surfaces or internal interfaces changes continuously or in fluid-structure interactions wher...

Graphic processing units have received much attention in last years. Compute-intensive algorithms operating on multidimensional arrays that have nearest neighbor dependency and/or exploit data locality can achieve massive speedups. Simulation of problems modeled by time-dependent Partial Differential Equations by using explicit time-stepping method...

The so called "hybrid parallelism paradigm", that combines programming techniques for architectures with distributed and shared memories using MPI ('Message Passing Inter-face') and OpenMP ('Open Multi-Processing') standards, is currently adopted to exploit the growing use of multicore computers, thus improving the efficiency of codes in such archi...

This work presents two software components aimed to relieve the costs of accessing high-performance parallel computing resources within a Python programming environment: MPI for Python and PETSc for Python.MPI for Python is a general-purpose Python package that provides bindings for the Message Passing Interface (MPI) standard using any back-end MP...

Generally, in problems where the Riemann invariants (RI) are known (e.g. the flow in a shallow rectangular channel, the isentropic gas flow equations), the imposition of non-reflective boundary conditions is straightforward. In problems where Riemann invariants are unknown (e.g. the flow in non-rectangular channels, the stratified 2D shallow water...

The aim of this paper is to analyze the aeroelastic processes developed during the starting phase of a rocket engine via a coupling fluid/structure code. This analysis gives a better understanding of the behavior of the structure as the shock waves propagate inside the engine nozzle. The gasdynamics Euler equations are solved for the fluid and cons...

The aim of this paper is to analyze the aeroelastic processes developed during the starting phase of a rocket engine via a coupling fluid/structure code. This analysis gives a better understanding of the behavior of the structure as the shock waves propagate inside the engine nozzle. The gasdynamics Euler equations are solved for the fluid and cons...

In this work, the development of a parallelizable preconditioner for domain decomposition methods in the context of Finite Element solution of partial differential equations arising in the context of CFD problems is studied. The preconditioner is based on solving a problem in a narrow strip around the interface of the partitioned problem. The theor...

This work reports our attempts to facilitate the access to high-performance parallel computing resources within a Python programming environment. The outcome of this effort are two open source and public domain packages, MPI for Python (known in short as mpi4py) and PETSc for Python (known in short as petsc4py). MPI for Python [1, 2, 3], is an open...

Muchos problemas de diseño en ingeniería están asociados al conocimiento del efecto del viento en las estructuras dispuestas a la intemperie. Las cargas por efecto del viento son uno de los parámetros de entrada necesarios para el cálculo. Generalmente este parámetro se selecciona en función de la importancia de la obra a partir de las estadísticas...

In this paper some results on the convergence of the Gauss–Seidel iteration when solving fluid/structure interaction problems with strong coupling via fixed point iteration are presented. The flow-induced vibration of a flat plate aligned with the flow direction at supersonic Mach number is studied. The precision of different predictor schemes and...

MPI for Python provides bindings of the message passing interface (MPI) standard for the Python programming language and allows any Python program to exploit multiple processors.In its first release, MPI for Python was constructed on top of the MPI-1 specification defining an object-oriented interface that closely followed the MPI-2 C++ bindings, a...

The number and type of boundary conditions to be used in the numerical modeling of fluid mechanics problems is normally chosen according to a simplified analysis of the characteristics, and also from the experience of the modeler. The problem is harder at inflow/outflow boundaries which are, in most cases, artificial boundaries, so that a bad decis...

A preconditioner for iterative solution of the interface problem in Schur Complement Domain Decomposition Methods is presented. This preconditioner is based on solving a global problem in a narrow strip around the interface. It requires much less memory and computing time than classical Neumann–Neumann preconditioner and its variants, and handles c...

In this paper, some pathologies found for simple tests solved by means of preconditioned full iterative schemes are presented. According to these results (Sections 4 and 5), the accuracy deterioration observed should be considered as a warning for the final application given to these solutions. Even though it is well known that full iterative solve...