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Fast and accurate simulations of air-cooled structures

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Title: Fast and accurate simulations of air-cooled structures
Authors: Dobrzynski, Cécile1 dobrzyns@ann.jussieu.fr, Frey, Pascal J.1, Mohammadi, Bijan2, Pironneau, Olivier1 pironneau@ann.jussieu.fr
Source: Computer Methods in Applied Mechanics & Engineering. Apr2006, Vol. 195 Issue 23/24, p3168-3180. 13p.
Subjects: Navier-Stokes equations, Finite element method, Computer-aided design, Numerical analysis
Abstract: Abstract: There are fields of engineering for which the CAD-based Navier–Stokes solvers are too expensive; architecture and medicine for blood flows are two such examples. Mesh generation and adaptation is also a bottleneck because the users are not expected to have the know-how. We report here on a Navier–Stokes solver for incompressible temperature and time dependent flows dedicated to architectural applications. The building blocks are not new: a finite element method with time implicit pressure projection steps and mesh adaptativity; but putting them together in an easy to use and efficient 3D code is the challenge which motivates this paper. For non-engineering applications the user interface is a big problem. In an earlier attempt we designed freefem3D based on a fictitious domain discretization, thus avoiding boundary fitted mesh. However it turned out that the display of the solutions requires a boundary fitted mesh; it is possible to generate a feasible surface mesh for graphics but it is much more difficult to generate a feasible surface mesh for FEM. In this project the user interface is taken from freefem3d; then, with a marching cube algorithm we produce a graphic only feasible mesh; finally a surface mesh, adapted to a FEM computation is constructed with an adaptation module and the result is used as input to a Delaunay volumic mesh generator. The solver is optimized and parallelized, all modules are the authors’ work. Three applications are presented, for which the data preparation takes less than a day and results are obtained overnight on a PC cluster. One of the application is presented in details; it is an air cooling system for a canister containing radio-nucleides. [Copyright &y& Elsevier]
Copyright of Computer Methods in Applied Mechanics & Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
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  Data: Fast and accurate simulations of air-cooled structures
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  Data: <searchLink fieldCode="AR" term="%22Dobrzynski%2C+Cécile%22">Dobrzynski, Cécile</searchLink><relatesTo>1</relatesTo><i> dobrzyns@ann.jussieu.fr</i><br /><searchLink fieldCode="AR" term="%22Frey%2C+Pascal+J%2E%22">Frey, Pascal J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mohammadi%2C+Bijan%22">Mohammadi, Bijan</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pironneau%2C+Olivier%22">Pironneau, Olivier</searchLink><relatesTo>1</relatesTo><i> pironneau@ann.jussieu.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22Computer+Methods+in+Applied+Mechanics+%26+Engineering%22">Computer Methods in Applied Mechanics & Engineering</searchLink>. Apr2006, Vol. 195 Issue 23/24, p3168-3180. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Navier-Stokes+equations%22">Navier-Stokes equations</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Computer-aided+design%22">Computer-aided design</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink>
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  Data: Abstract: There are fields of engineering for which the CAD-based Navier–Stokes solvers are too expensive; architecture and medicine for blood flows are two such examples. Mesh generation and adaptation is also a bottleneck because the users are not expected to have the know-how. We report here on a Navier–Stokes solver for incompressible temperature and time dependent flows dedicated to architectural applications. The building blocks are not new: a finite element method with time implicit pressure projection steps and mesh adaptativity; but putting them together in an easy to use and efficient 3D code is the challenge which motivates this paper. For non-engineering applications the user interface is a big problem. In an earlier attempt we designed freefem3D based on a fictitious domain discretization, thus avoiding boundary fitted mesh. However it turned out that the display of the solutions requires a boundary fitted mesh; it is possible to generate a feasible surface mesh for graphics but it is much more difficult to generate a feasible surface mesh for FEM. In this project the user interface is taken from freefem3d; then, with a marching cube algorithm we produce a graphic only feasible mesh; finally a surface mesh, adapted to a FEM computation is constructed with an adaptation module and the result is used as input to a Delaunay volumic mesh generator. The solver is optimized and parallelized, all modules are the authors’ work. Three applications are presented, for which the data preparation takes less than a day and results are obtained overnight on a PC cluster. One of the application is presented in details; it is an air cooling system for a canister containing radio-nucleides. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Computer Methods in Applied Mechanics & Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.cma.2005.03.008
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              Text: Apr2006
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