commit db2a4fcbd9f260d3ff3ee5d76307154736b672c6
parent c3163496385c123d1b771441de2a5a88b25ceb95
Author: Benjamin Piaud <benjamin.piaud@meso-star.com>
Date: Mon, 27 Nov 2017 10:09:47 +0100
first full stardis page
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<h1>Stardis - The Monte-Carlo solver for coupled thermal problems</h1>
</header>
-<p>Stardis computes the <b>propagator</b> or the <b>Green function</b> of coupled thermal problems. <b>coupled</b> refers to conductive, convective and radiative transfers. Stardis can deal with complex geometries and complex high-frequency external solicitations compared to characteristic time of the system.</p>
+<p>Stardis computes the <b>propagator</b> or the <b>Green function</b> of
+coupled thermal problems under the linear assumption. <b>Coupled</b> refers to
+conductive, convective and radiative transfers . Stardis can deal with complex
+geometries and complex high-frequency external solicitations compared to the
+characteristic time of the system.</p>
-<p>The knowledge of the propagator is useful for thermal engineer because it gives some crucial informations to analyse the heat transfer in the system. The enginneer accessess at some new informations like <b> "from where the heat comes at this location ?"</b>. Among the possibilies given by the propagator, it can be used as a rapid modele without simplifying the geometrical description. </p>
+<p>The knowledge of the propagator is useful for thermal engineer because it
+gives some crucial informations to analyse the heat transfer in the system.
+The engineer accesses at some new informations like <b> "from where the heat
+comes at this location ?"</b>. Among the possibilies given by the propagator,
+it can be used as a rapid modele without simplifying the geometrical description. </p>
-<p>Stardis is not a monolothic software, it's a solver which can be integrated in various thermal engineering toolchain for designing and optimizing.</p>
+<p>The algorithms implemented in Stardis are inherited from the state of the art
+of the Monte-Carlo method applied to radiative transfers physics (Delatorre et al.,
+"Monte Carlo advances and concentrated solar applications", Solar Energy, 2014)
+combined to the statistical point of view of the conductive heat transfer
+(Kac, "On Distributions of Certain Wiener Functionals". Trans. of the American
+Math. Soc., 1949 and Muller,"Some continuous Monte-Carlo Methods for the Dirichlet
+Problem", Annals of Math. Stat., 1956). And this theoritical framework can be used
+in pratice to deal with the complex geometries thanks to the state of the art of
+computer graphics which it's at the origin of a disruptive technology in the cinema
+industry (FX and animated movies).</p>
+<p> This theoritical framework leads to a <b>statistical point of view</b> of the whole
+heat transfer processess (conductive-convective-radiative) when the linear
+assumption is relevant. And this modele can be solved by a <b>Monte-Carlo approach</b>
+which samples some <b>thermal paths</b>. This type of algorithms can be considered
+as an extension of Monte-Carlo algorithms to solve radiative transfer by sampling
+optical paths. An interesting property of this approach is that the resulting
+algorithms does not rely on a volume mesh of the system.
+</p>
-<h2>Example of integration</h2>
+<h2>Get Stardis</h2>
-<h2>Green-based engineering</h2>
+<p>Stardis is not a monolothic software, it's <b>a solver which can be integrated</b>
+in various thermal engineering simulation toolchain for designing and
+optimizing.</p>
+
+<p>To get Stardis, contact us, we have a versatile offer :
+<ul>
+ <li> we can provide a Stardis SDK for developpers,</li>
+ <li> we can integrate Stardis in your software toolchain,</li>
+ <li> we can develop a custom software.</li>
+</ul>
+</p>
+
+<p> Stardis is available under many licences. That depends on the customer
+constraints (open-source, proprietary, ...). Of course, these offers can be
+accompanying with theoretical and practice trainings.</p>
+
+
+<h2>Examples of integration and development</h2>
+
+<h3> EDF R&D - SYRTHES </h3>
+
+<div id="img" style="width: 18em">
+ <a href="syrthes.png">
+ <img src="syrthes.png" style="float: relative" alt="SYRTHES">
+ </a>
+ <div id="caption">
+ SYRTHES : the thermal softawre of EDF R&D.
+ </div>
+</div>
+
+<p> For its needs of numerical simulations of thermal transfers, EDF R&D develops
+and maintains since several years the SYRTHES software. It solves the conductive
+and radiative transfers in complex geometries and it was designed to be
+integrated in the EDF software toolchain (SALOME). The conductive heat transfer
+is solved by finite elements method and the radiative solver is based on
+radiosity method.</p>
+
+<p> Meso-Star and the SYRTHES developers collaborate since 2015 to integrate new
+features in SYRTHES based the statistical point of view of the thermal transfers.
+Meso-Star accompanies SYRTHES developers to integrate Stardis. The objective is not
+replacing the existing solvers but rather than adding <b>some complementary features
+to facilitate the analysis of numerical simulations</b>.</p>
+
+
+<h3> PROMES-CNRS - Star-Therm </h3>
+
+<div id="img" style="width: 18em">
+ <a href="star-therm.png">
+ <img src="star-therm.png" style="float: relative" alt="Star-Therm">
+ </a>
+ <div id="caption">
+ Star-Therm : A code to solve conducto-radiative thermal problems in complex foams.
+ </div>
+</div>
-<h2>Get Stardis</h2>
+<p>Meso-Star has developped for the PROMES-CNRS laboratory the Star-Therm code
+based on Stardis solver which solves coupled conducto-radiative thermal problems.
+It was designed to deal with complex geometries such as <b>metallic or SiC foams</b>.
+This type of foams are used as heat exchanger in solar <b>concentrated solar
+process</b> to transfer energy from incoming sunlight radiation to a working fluid.</p>
+<p>The physical model consists in taking into account coupled thermal radiation in
+vacuum and conduction in opaque solids. Incoming solar energy (radiation) is
+deposited at the surface of a metallic foam, which results in a given boundary
+temperature. Therefore, boundary conditions and initial conditions are known.
+Star-Therm will subsequently have to compute the temperature at any position
+within the solid.</p>
