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Sant'Ambrogio di Torino, Italy

Lombardi E.,Optimad Engineering Srl | Bergmann M.,French Institute for Research in Computer Science and Automation | Camarri S.,University of Pisa | Iollo A.,French Institute for Research in Computer Science and Automation
Journal Europeen des Systemes Automatises | Year: 2011

We propose an optimal sampling strategy to build a robust low-order model. This idea is applied to the construction of a vortex wake model accurate for several regimes. In addition we explore the relationships between unstable modes and low-order modelling. An example of control based on a linearized approach is presented. © 2011 Lavoisier, Paris.


Mimeau C.,University Grenoble alpes | Gallizio F.,Optimad Engineering Srl | Cottet G.-H.,University Grenoble alpes | Mortazavi I.,French National Conservatory of Arts and Crafts
International Journal for Numerical Methods in Fluids | Year: 2015

In this work, a penalization method is discussed in the context of vortex methods for incompressible flows around complex geometries. In particular, we illustrate the method in two cases: the flow around a rotating blade for Reynolds numbers 1000 and 10,000 and the flow past a semi-circular body consisting of a porous layer surrounding a rigid body at Reynolds numbers 550 and 3000. In the latter example, the results are interpreted in terms of control strategy. © 2015 John Wiley & Sons, Ltd.


Morency F.,Ecole de Technologie Superieure of Montreal | Beaugendre H.,French Institute for Research in Computer Science and Automation | Gallizio F.,Optimad Engineering Srl | Laurens S.,French Institute for Research in Computer Science and Automation
Modelling and Simulation in Engineering | Year: 2011

We propose to model ice shedding trajectories by an innovative paradigm that is based on cartesian grids, penalization and level sets. The use of cartesian grids bypasses the meshing issue, and penalization is an efficient alternative to explicitly impose boundary conditions so that the body-fitted meshes can be avoided, making multifluid/multiphysics flows easy to set up and simulate. Level sets describe the geometry in a nonparametric way so that geometrical and topological changes due to physics and in particular shed ice pieces are straight forward to follow. The model results are verified against the case of a free falling sphere. The capabilities of the proposed model are demonstrated on ice trajectories calculations for flow around iced cylinder and airfoil. Copyright © 2011 Hlose Beaugendre et al.


Beaugendre H.,French Institute for Research in Computer Science and Automation | Beaugendre H.,Institute Of Mathematiques Of Bordeaux | Morency F.,Ecole de Technologie Superieure of Montreal | Gallizio F.,Optimad Engineering Srl
AIAA Atmospheric and Space Environments Conference 2010 | Year: 2010

In this work we propose to model ice shedding by an innovative paradigm that is based on cartesian grids, penalization and level sets. The use of cartesian grids bypass the meshing issue in complex geometries and moreover allows extensions to higher order accuracy in a natural and simple way. Penalization is an efficient alternative to explicitly impose boundary conditions so that the body fitted meshes can be avoided, making multi fluid/multi physics flows easy to set up and simulate. Level sets describe the geometry in a non-parametric way so that geometrical and topological changes due to physics and in particular ice-shedding are straight forward to follow. © 2010 by Her Majesty the Queen in Right of Canada.


Cottet G.-H.,LJK Tour IRMA | Gallizio F.,Polytechnic University of Turin | Gallizio F.,Optimad Engineering Srl | Magni A.,LJK Tour IRMA | Mortazavi I.,French Institute for Research in Computer Science and Automation
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM | Year: 2010

The aim of this work is to couple vortex methods with the penalization methods in order to take advantage from both of them. This immersed boundary approach maintains the efficiency of vortex methods for high Reynolds numbers focusing the computational task on the rotational zones and avoids their lack on the no-slip boundary conditions replacing the vortex sheet method by the penalization of obstacles. This method that is very appropriate for bluff-body flows is validated for the flow around a circular cylinder on a wide range of Reynolds numbers. Copyright © 2010 by ASME.

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