<?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>1390-0129</journal-id>
<journal-title><![CDATA[Revista Politécnica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Politéc. (Quito)]]></abbrev-journal-title>
<issn>1390-0129</issn>
<publisher>
<publisher-name><![CDATA[Escuela Politécnica Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1390-01292018000300053</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelación Numérica del Flujo Rasante en una Rápida Escalonada Aplicando la Dinámica de Fluidos Computacional (CFD) Mediante el Uso de Flow-3D]]></article-title>
<article-title xml:lang="en"><![CDATA[Numerical Modeling of Flush Flow in a Rapid Step Applying Computational Fluid Dynamics (CFD) Using Flow-3D]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Casa]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela Politécnica Nacional  ]]></institution>
<addr-line><![CDATA[ Quito]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2018</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>53</fpage>
<lpage>64</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S1390-01292018000300053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S1390-01292018000300053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S1390-01292018000300053&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El presente estudio tiene como objetivo principal desarrollar la modelación numérica del flujo rasante en una rápida escalonada aplicando el paquete comercial FLOW-3D. Actualmente el diseño de este tipo de estructuras se realiza con el uso de expresiones empíricas obtenidas con base en la modelación física y estudios complementarios en la modelación numérica del flujo sobre la rápida escalonada con apoyo de un código CFD. Con el modelo numérico se busca estimar la velocidad del flujo en la región uniforme, y el coeficiente de fricción para cuatro caudales de operación de la rápida escalonada (&#1012;=45º, Hd=4.61m). La representación de un flujo autoaireado es complejo, por lo que el programa aproxima la solución con ciertas limitaciones, para ello emplea el modelo air entrainment, el modelo drift flux y un modelo de turbulencia k-&#1297; RNG. Los resultados obtenidos con la modelación numérica y la modelación física acerca del inicio de autoaireación natural del flujo y la profundidad del flujo bifásico en la región uniforme presentan desviaciones de hasta el 10% debido a que el flujo es altamente turbulento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The main objective of this project is to develop the numerical modeling of the skimming flow in a stepped spillway using FLOW-3D. The design of these structures is based on the use of empirical expressions obtained from physical modeling and complementary studies in the numerical modeling of flow over the stepped spillway with support of CFD code. The numerical model is used to estimate the flow velocity in the uniform region and the friction coefficient of the stepped spillway (&#1012; = 45º, Hd=4.61m). The representation of auto aeration a flow is complex, so the program approximates the solution with certain limitations, using an air entrainment model; drift flux model and turbulence model k-&#1297; RNG. The results obtained with numerical modeling and physical modeling at the beginning of natural auto aeration of flow and depth of the biphasic flow in the uniform region presents deviations above to 10% perhaps the flow is highly turbulent.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Rápida Escalonada]]></kwd>
<kwd lng="es"><![CDATA[Flujo Rasante]]></kwd>
<kwd lng="es"><![CDATA[Introducción de Aire]]></kwd>
<kwd lng="es"><![CDATA[Modelación Numérica]]></kwd>
<kwd lng="es"><![CDATA[FLOW-3D]]></kwd>
<kwd lng="en"><![CDATA[Stepped spillway]]></kwd>
<kwd lng="en"><![CDATA[skimming flow]]></kwd>
<kwd lng="en"><![CDATA[air entrainment]]></kwd>
<kwd lng="en"><![CDATA[drift flux]]></kwd>
<kwd lng="en"><![CDATA[numerical modeling]]></kwd>
<kwd lng="en"><![CDATA[FLOW-3D]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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