<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2004000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Convección natural en medios porosos y libres: simulación numérica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Báez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bermúdez]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nicolás]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana Departamento de Matemáticas ]]></institution>
<addr-line><![CDATA[Iztapalapa Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Computación ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2004</year>
</pub-date>
<volume>50</volume>
<numero>1</numero>
<fpage>36</fpage>
<lpage>48</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2004000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2004000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2004000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presentan simulaciones numéricas para convección natural en cavidades rectangulares, en general inclinadas, tanto en medios porosos como en medios libres. La modelación matemática se basa en ambos casos en la aproximación de Boussinesq dependiente del tiempo, con la cual se obtiene la estructura de fluidos incompresibles; las ecuaciones de momento están dadas por las ecuaciones de Darcy en medios porosos y por las ecuaciones de Navier-Stokes en medios libres. En los dos casos se considera la formulación en términos de variables función corriente y vorticidad. Los resultados se obtienen con un esquema numérico simple, cuya efectividad depende esencialmente de un proceso iterativo de punto fijo para resolver el sistema no lineal de ecuaciones elípticas que se obtiene al aplicar una discretización temporal adecuada de segundo orden en las ecuaciones que dependen explícitamente del tiempo. El proceso iterativo conduce a la solución de ecuaciones elípticas lineales y simétricas, para las cuales existen eficientes métodos de solución numérica. Los parámetros involucrados en las simulaciones son el número de Rayleigh, la razón geométrica y el ángulo de inclinación de la cavidad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Numerical simulations are presented for natural convection in rectangular tilted cavities for a porous medium and for a homogeneous fluid as well. In both cases the mathematical modeling is based on the time dependent Boussinesq approximation which gives an incompressible fluid structure; the momentum equations are given for the Darcy ones in porous medium and for the Navier&#45;Stokes equations in homogeneous fluid. The formulation in stream function and vorticity variables is considered. The numerical simulations are obtained with a simple numerical scheme whose effectiveness relies mainly on a fixed point iterative process to solve the elliptic nonlinear system that is obtained once a convenient second order time discretization is performed on each equation that depends explicitly in time. The iterative process leads to the solution of symmetric linear elliptic equations for which very efficient numerical solvers exist. The parameters involved in the simulations are the Rayleigh number, the aspect ratio, and the inclination angle of the cavity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Aproximación de Boussinesq]]></kwd>
<kwd lng="es"><![CDATA[púnto fijo]]></kwd>
<kwd lng="es"><![CDATA[cavidades rectangulares e inclinadas]]></kwd>
<kwd lng="en"><![CDATA[Boussinesq aproximation]]></kwd>
<kwd lng="en"><![CDATA[fixed point iterative process]]></kwd>
<kwd lng="en"><![CDATA[tilted rectangular cavities]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Convecci&oacute;n natural en medios porosos y libres: simulaci&oacute;n num&eacute;rica</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>E. B&aacute;ez<sup>a</sup>, B. Berm&uacute;dez<sup>b</sup> y A. Nicol&aacute;s<sup>a</sup>, *</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Departamento de Matem&aacute;ticas, Universidad Aut&oacute;noma Metropolitana&#45;Iztapalapa Av. Michoac&aacute;n y la Pur&iacute;sima, Col. Vicentina, 09340 M&eacute;xico, D.F., M&eacute;xico. *</i> E&#45;mail: <a href="mailto:anc@xanum.uam.mx">anc@xanum.uam.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Facultad de Computaci&oacute;n, Benem&eacute;rita Universidad Aut&oacute;noma de Puebla 14 Sur y San Claudio, CU, Puebla, Pue., M&eacute;xico.</i> E&#45;mail: <a href="mailto:bbj@solarium.cs.buap.mx">bbj@solarium.cs.buap.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 11 de diciembre de 2002    <br> 	Aceptado el 21 de mayo de 2003</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se presentan simulaciones num&eacute;ricas para convecci&oacute;n natural en cavidades rectangulares, en general inclinadas, tanto en medios porosos como en medios libres. La modelaci&oacute;n matem&aacute;tica se basa en ambos casos en la aproximaci&oacute;n de Boussinesq dependiente del tiempo, con la cual se obtiene la estructura de fluidos incompresibles; las ecuaciones de momento est&aacute;n dadas por las ecuaciones de Darcy en medios porosos y por las ecuaciones de Navier&#45;Stokes en medios libres. En los dos casos se considera la formulaci&oacute;n en t&eacute;rminos de variables funci&oacute;n corriente y vorticidad. Los resultados se obtienen con un esquema num&eacute;rico simple, cuya efectividad depende esencialmente de un proceso iterativo de punto fijo para resolver el sistema no lineal de ecuaciones el&iacute;pticas que se obtiene al aplicar una discretizaci&oacute;n temporal adecuada de segundo orden en las ecuaciones que dependen expl&iacute;citamente del tiempo. El proceso iterativo conduce a la soluci&oacute;n de ecuaciones el&iacute;pticas lineales y sim&eacute;tricas, para las cuales existen eficientes m&eacute;todos de soluci&oacute;n num&eacute;rica. Los par&aacute;metros involucrados en las simulaciones son el n&uacute;mero de Rayleigh, la raz&oacute;n geom&eacute;trica y el &aacute;ngulo de inclinaci&oacute;n de la cavidad.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Aproximaci&oacute;n de Boussinesq; p&uacute;nto fijo; cavidades rectangulares e inclinadas.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Numerical simulations are presented for natural convection in rectangular tilted cavities for a porous medium and for a homogeneous fluid as well. In both cases the mathematical modeling is based on the time dependent Boussinesq approximation which gives an incompressible fluid structure; the momentum equations are given for the Darcy ones in porous medium and for the Navier&#45;Stokes equations in homogeneous fluid. The formulation in stream function and vorticity variables is considered. The numerical simulations are obtained with a simple numerical scheme whose effectiveness relies mainly on a fixed point iterative process to solve the elliptic nonlinear system that is obtained once a convenient second order time discretization is performed on each equation that depends explicitly in time. The iterative process leads to the solution of symmetric linear elliptic equations for which very efficient numerical solvers exist. The parameters involved in the simulations are the Rayleigh number, the aspect ratio, and the inclination angle of the cavity.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Boussinesq aproximation; fixed point iterative process; tilted rectangular cavities.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">PACS: 47.55.Mh; 47.85.&#45;g; 02.60.&#45;x</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v50n1/v50n1a7.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. R. Glowinski, <i>Lectures in Applied Mathematics</i> <b>28</b> AMS, Providence, RI (1991) 219.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8299279&pid=S0035-001X200400010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. B. Berm&uacute;dez and A. Nicol&aacute;s, <i>Int. J. Numer. Methods Fluids</i> <b>29</b> (1999) 397.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8299281&pid=S0035-001X200400010000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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