<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792013000500325</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Simulación del movimiento del aire en un invernadero tipo venlo]]></article-title>
<article-title xml:lang="en"><![CDATA[Simulation of air movement in a venlo-type greenhouse]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prado Hernández]]></surname>
<given-names><![CDATA[Jorge Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojano Aguilar]]></surname>
<given-names><![CDATA[Abraham]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León Mojarro]]></surname>
<given-names><![CDATA[Benjamín de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo García]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibáñez Castillo]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángeles Montiel]]></surname>
<given-names><![CDATA[Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Cruz]]></surname>
<given-names><![CDATA[Irineo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Área de Manejo y Conservación de Suelo y Agua ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo Ingeniería Agrícola y Uso Integral del Agua ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Mexicano de Tecnología del Agua  ]]></institution>
<addr-line><![CDATA[ Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>31</volume>
<numero>4</numero>
<fpage>325</fpage>
<lpage>337</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792013000500325&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792013000500325&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792013000500325&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se han realizado aproximaciones teóricas para estudiar la ventilación en invernaderos como los modelos mecanicistas, que se basan en el balance de energía, pero sólo proveen información acerca de la tasa de ventilación global sin ofrecer detalles de la distribución espacial de las líneas de corriente de aire. En años recientes se ha observado que los modelos matemáticos basados en las ecuaciones completas de Navier-Stokes representan adecuadamente la ventilación en invernaderos y ofrecen información detallada de la distribución espacial de la masa de aire; sin embargo, resulta muy costosa la adquisición de los permisos de uso de los paquetes de cómputo comerciales por lo que es necesario investigar sobre modelos simplificados con el fin de reducir los costos de los estudios. En este trabajo se simuló la circulación de aire en un invernadero tipo Venlo en diferentes condiciones de ventilación, mediante dos modelos: uno de ellos considera las ecuaciones completas de Navier-Stokes, y el otro resuelve un modelo simplificado de Navier-Stokes en el que no se considera la aceleración convectiva en la ecuación de cantidad de movimiento. Para el estudio del modelo completo se usó el programa comercial FLUENT versión 11.0 (ANSYS Inc, 2013) y el modelo simplificado se resolvió numéricamente en MATLAB. Ambos métodos arrojan tasas de ventilación globales similares, pero la circulación de la masa de aire es diferente en algunos escenarios de ventilación. El método simplificado resultó más económico en dinero y tiempo, debido a que su solución numérica se puede implementar con mayor facilidad en algún lenguaje de programación de medio y alto nivel, y porque los tiempos de cómputo se reducen sustancialmente. Para tener mayor detalle de las zonas de recirculación de la masa de aire en el interior de los invernaderos se debe considerar el modelo completo de Navier-Stokes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Theoretical approaches and mechanistic models based on energy balance have been employed to study ventilation in greenhouses. These methodologies, however, provide information only on overall ventilation rate and do not provide details of the spatial distribution of the air stream lines. In recent years, it has been shown that mathematical models based on the complete equations of Navier-Stokes model adequately represent ventilation in greenhouses and offer detailed information about spatial distribution of the air mass. Acquiring the permit to use this commercial software is very expensive; therefore, it is important to do research on simplified models in order to reduce research costs. In this study, movement of air was simulated in a Venlo-type greenhouse under different conditions of ventilation using two models: one of them considers the complete Navier-Stokes equations which is called full model, and the other is a Navier-Stokes simplified model in which convective acceleration is not considered in the momentum equation. The full model was solved using the FLUENT software version 11.0 (ANSYS Inc., 2013) and the simplified model was solved numerically in MATLAB. Both methods showed similar results on ventilation rates, but air mass circulation is different in some ventilation scenarios. The simplified method saves more money and time than the full method because its numerical solution can be implemented more easily in medium and high level programming language and because computational times are substantially reduced. To get better results on recirculation zones of the air mass inside a greenhouse, the Navier-Stokes complete model should be considered.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ventilación natural]]></kwd>
<kwd lng="es"><![CDATA[aplicaciones de elemento finito]]></kwd>
<kwd lng="es"><![CDATA[simulación de la ventilación]]></kwd>
<kwd lng="en"><![CDATA[natural ventilation]]></kwd>
<kwd lng="en"><![CDATA[finite element applications]]></kwd>
<kwd lng="en"><![CDATA[simulation of the ventilation]]></kwd>
</kwd-group>
</article-meta>
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