<?xml version="1.0" encoding="utf-8"?>
<TEI xmlns="http://www.tei-c.org/ns/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:hal="http://hal.archives-ouvertes.fr/" xmlns:gml="http://www.opengis.net/gml/3.3/" xmlns:gmlce="http://www.opengis.net/gml/3.3/ce" version="1.1" xsi:schemaLocation="http://www.tei-c.org/ns/1.0 http://api.archives-ouvertes.fr/documents/aofr-sword.xsd">
  <teiHeader>
    <fileDesc>
      <titleStmt>
        <title>HAL TEI export of hal-04310899</title>
      </titleStmt>
      <publicationStmt>
        <distributor>CCSD</distributor>
        <availability status="restricted">
          <licence target="https://creativecommons.org/publicdomain/zero/1.0/">CC0 1.0 - Universal</licence>
        </availability>
        <date when="2026-05-17T05:29:29+02:00"/>
      </publicationStmt>
      <sourceDesc>
        <p part="N">HAL API Platform</p>
      </sourceDesc>
    </fileDesc>
  </teiHeader>
  <text>
    <body>
      <listBibl>
        <biblFull>
          <titleStmt>
            <title xml:lang="en">Reduced-Order Model for Microscale Atmospheric Dispersion Combining Multi-Fidelity LES and RANS Data</title>
            <author role="aut">
              <persName>
                <forename type="first">Bastien</forename>
                <surname>Nony</surname>
              </persName>
              <idno type="halauthorid">3013890-0</idno>
              <affiliation ref="#struct-1058131"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Mélanie C.</forename>
                <surname>Rochoux</surname>
              </persName>
              <email type="md5">a87ce219f9b894670fe70bac29833565</email>
              <email type="domain">cerfacs.fr</email>
              <idno type="idhal" notation="string">melanie-rochoux</idno>
              <idno type="idhal" notation="numeric">943319</idno>
              <idno type="halauthorid" notation="string">1346166-943319</idno>
              <idno type="ORCID">https://orcid.org/0000-0001-7698-2213</idno>
              <idno type="GOOGLE SCHOLAR">https://scholar.google.fr/citations?user=PyB6SQwAAAAJ</idno>
              <affiliation ref="#struct-1058131"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Thomas</forename>
                <surname>Jaravel</surname>
              </persName>
              <email type="md5">139a634c8bc2632107cd3d733ea6665b</email>
              <email type="domain">cerfacs.fr</email>
              <idno type="idhal" notation="string">tjaravel</idno>
              <idno type="idhal" notation="numeric">1578913</idno>
              <idno type="halauthorid" notation="string">674727-1578913</idno>
              <affiliation ref="#struct-1058131"/>
            </author>
            <author role="aut">
              <persName>
                <forename type="first">Didier</forename>
                <surname>Lucor</surname>
              </persName>
              <email type="md5">6cabf8c52a5fa8f917a1284f1f43a155</email>
              <email type="domain">limsi.fr</email>
              <ptr type="url" target="https://perso.limsi.fr/lucor/"/>
              <idno type="idhal" notation="string">didier-lucor</idno>
              <idno type="idhal" notation="numeric">176751</idno>
              <idno type="halauthorid" notation="string">38943-176751</idno>
              <idno type="ORCID">https://orcid.org/0000-0003-4334-4586</idno>
              <idno type="GOOGLE SCHOLAR">https://scholar.google.com/citations?user=qCVFS6AAAAAJ&amp;hl=en</idno>
              <idno type="IDREF">https://www.idref.fr/150876017</idno>
              <idno type="VIAF">https://viaf.org/viaf/305366976</idno>
              <affiliation ref="#struct-1061259"/>
              <affiliation ref="#struct-1065304"/>
            </author>
            <editor role="depositor">
              <persName>
                <forename>Didier</forename>
                <surname>Lucor</surname>
              </persName>
              <email type="md5">6cabf8c52a5fa8f917a1284f1f43a155</email>
              <email type="domain">limsi.fr</email>
            </editor>
          </titleStmt>
          <editionStmt>
            <edition n="v1" type="current">
              <date type="whenSubmitted">2023-11-27 22:48:55</date>
              <date type="whenModified">2025-12-08 16:52:49</date>
              <date type="whenReleased">2023-11-30 11:40:19</date>
              <date type="whenProduced">2023-06-12</date>
              <date type="whenEndEmbargoed">2023-11-27</date>
              <ref type="file" target="https://hal.science/hal-04310899v1/document">
                <date notBefore="2023-11-27"/>
              </ref>
              <ref type="file" subtype="author" n="1" target="https://hal.science/hal-04310899v1/file/proc_uncecomp2023.pdf" id="file-4310899-3763119">
                <date notBefore="2023-11-27"/>
              </ref>
            </edition>
            <respStmt>
              <resp>contributor</resp>
              <name key="463864">
                <persName>
                  <forename>Didier</forename>
                  <surname>Lucor</surname>
                </persName>
                <email type="md5">6cabf8c52a5fa8f917a1284f1f43a155</email>
                <email type="domain">limsi.fr</email>
              </name>
            </respStmt>
          </editionStmt>
          <publicationStmt>
            <distributor>CCSD</distributor>
            <idno type="halId">hal-04310899</idno>
            <idno type="halUri">https://hal.science/hal-04310899</idno>
            <idno type="halBibtex">nony:hal-04310899</idno>
            <idno type="halRefHtml">&lt;i&gt;5th ECCOMAS Thematic Conference on Uncertainty Quantification in Computational Science and Engineering&lt;/i&gt;, M. Papadrakakis, V. Papadopoulos, G. Stefanou, Jun 2023, Athènes, Greece. &lt;a target="_blank" href="https://dx.doi.org/10.7712/120223.10337.19817"&gt;&amp;#x27E8;10.7712/120223.10337.19817&amp;#x27E9;&lt;/a&gt;</idno>
            <idno type="halRef">5th ECCOMAS Thematic Conference on Uncertainty Quantification in Computational Science and Engineering, M. Papadrakakis, V. Papadopoulos, G. Stefanou, Jun 2023, Athènes, Greece. &amp;#x27E8;10.7712/120223.10337.19817&amp;#x27E9;</idno>
            <availability status="restricted">
              <licence target="https://about.hal.science/hal-authorisation-v1/">HAL Authorization<ref corresp="#file-4310899-3763119"/></licence>
            </availability>
          </publicationStmt>
          <seriesStmt>
            <idno type="stamp" n="INSU">INSU - Institut National des Sciences de l'Univers</idno>
            <idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno>
            <idno type="stamp" n="OMP">Observatoire Midi-Pyrénées</idno>
            <idno type="stamp" n="CENTRALESUPELEC">Ecole CentraleSupélec</idno>
            <idno type="stamp" n="UNIV-PARIS-SACLAY">Université Paris-Saclay</idno>
            <idno type="stamp" n="UNIVERSITE-PARIS-SACLAY" corresp="UNIV-PARIS-SACLAY">Université Paris-Saclay</idno>
            <idno type="stamp" n="LISN">Laboratoire Interdisciplinaire des Sciences du Numérique</idno>
            <idno type="stamp" n="GS-COMPUTER-SCIENCE">Graduate School Computer Science</idno>
            <idno type="stamp" n="LISN-DATAFLOT" corresp="LISN">DAta science, TrAnsition, Fluid instabiLity, contrOl, Turbulence </idno>
            <idno type="stamp" n="CECI">Climat, Environnement, Couplages et Incertitudes</idno>
          </seriesStmt>
          <notesStmt>
            <note type="audience" n="2">International</note>
            <note type="invited" n="0">No</note>
            <note type="popular" n="0">No</note>
            <note type="peer" n="1">Yes</note>
            <note type="proceedings" n="1">Yes</note>
          </notesStmt>
          <sourceDesc>
            <biblStruct>
              <analytic>
                <title xml:lang="en">Reduced-Order Model for Microscale Atmospheric Dispersion Combining Multi-Fidelity LES and RANS Data</title>
                <author role="aut">
                  <persName>
                    <forename type="first">Bastien</forename>
                    <surname>Nony</surname>
                  </persName>
                  <idno type="halauthorid">3013890-0</idno>
                  <affiliation ref="#struct-1058131"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Mélanie C.</forename>
                    <surname>Rochoux</surname>
                  </persName>
                  <email type="md5">a87ce219f9b894670fe70bac29833565</email>
                  <email type="domain">cerfacs.fr</email>
                  <idno type="idhal" notation="string">melanie-rochoux</idno>
                  <idno type="idhal" notation="numeric">943319</idno>
                  <idno type="halauthorid" notation="string">1346166-943319</idno>
                  <idno type="ORCID">https://orcid.org/0000-0001-7698-2213</idno>
                  <idno type="GOOGLE SCHOLAR">https://scholar.google.fr/citations?user=PyB6SQwAAAAJ</idno>
                  <affiliation ref="#struct-1058131"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Thomas</forename>
                    <surname>Jaravel</surname>
                  </persName>
                  <email type="md5">139a634c8bc2632107cd3d733ea6665b</email>
                  <email type="domain">cerfacs.fr</email>
                  <idno type="idhal" notation="string">tjaravel</idno>
                  <idno type="idhal" notation="numeric">1578913</idno>
                  <idno type="halauthorid" notation="string">674727-1578913</idno>
                  <affiliation ref="#struct-1058131"/>
                </author>
                <author role="aut">
                  <persName>
                    <forename type="first">Didier</forename>
                    <surname>Lucor</surname>
                  </persName>
                  <email type="md5">6cabf8c52a5fa8f917a1284f1f43a155</email>
                  <email type="domain">limsi.fr</email>
                  <ptr type="url" target="https://perso.limsi.fr/lucor/"/>
                  <idno type="idhal" notation="string">didier-lucor</idno>
                  <idno type="idhal" notation="numeric">176751</idno>
                  <idno type="halauthorid" notation="string">38943-176751</idno>
                  <idno type="ORCID">https://orcid.org/0000-0003-4334-4586</idno>
                  <idno type="GOOGLE SCHOLAR">https://scholar.google.com/citations?user=qCVFS6AAAAAJ&amp;hl=en</idno>
                  <idno type="IDREF">https://www.idref.fr/150876017</idno>
                  <idno type="VIAF">https://viaf.org/viaf/305366976</idno>
                  <affiliation ref="#struct-1061259"/>
                  <affiliation ref="#struct-1065304"/>
                </author>
              </analytic>
              <monogr>
                <meeting>
                  <title>5th ECCOMAS Thematic Conference on Uncertainty Quantification in Computational Science and Engineering</title>
                  <date type="start">2023-06-12</date>
                  <date type="end">2023-06-14</date>
                  <settlement>Athènes</settlement>
                  <country key="GR">Greece</country>
                </meeting>
                <respStmt>
                  <resp>conferenceOrganizer</resp>
                  <name>M. Papadrakakis, V. Papadopoulos, G. Stefanou</name>
                </respStmt>
                <imprint/>
              </monogr>
              <idno type="doi">10.7712/120223.10337.19817</idno>
            </biblStruct>
          </sourceDesc>
          <profileDesc>
            <langUsage>
              <language ident="en">English</language>
            </langUsage>
            <textClass>
              <keywords scheme="author">
                <term xml:lang="en">Co-kriging</term>
                <term xml:lang="en">Proper Orthogonal Decomposition</term>
                <term xml:lang="en">Convolutional Autoencoder</term>
                <term xml:lang="en">Atmospheric Boundary-Layer Flows</term>
                <term xml:lang="en">Computational Fluid Dynamics</term>
                <term xml:lang="en">Multi-fidelity</term>
              </keywords>
              <classCode scheme="halDomain" n="spi">Engineering Sciences [physics]</classCode>
              <classCode scheme="halDomain" n="spi.meca.mefl">Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph]</classCode>
              <classCode scheme="halTypology" n="COMM">Conference papers</classCode>
              <classCode scheme="halOldTypology" n="COMM">Conference papers</classCode>
              <classCode scheme="halTreeTypology" n="COMM">Conference papers</classCode>
            </textClass>
            <abstract xml:lang="en">
              <p>Because of the complex turbulent flow dynamics caused by interactions between the atmospheric surface layer and the urban topography, forecasting microscale pollutant concentration fields is crucial for monitoring plume dispersion in urban regions. To capture these dynamics, large-eddy simulation (LES) is regarded as a high-fidelity numerical approach, however, it lacks real-time capabilities and remains costly because highly dimensional. Reynolds-averaged Navier-Stokes (RANS) approach is a cruder path to modelling these phenomena based on a statistical description of turbulent phenomena, leading to averaged transport equations. It is much less computationally expensive but also less accurate in representing interactions between the atmospheric boundary-layer flow and the buildings in urban areas. Designing an efficient reduced-order model (ROM) with a level of precision similar to the LES approach and accounting for atmospheric and point-source emission uncertainties is of primary importance. In this paper, we propose a novel multi-fidelity ROM, which combines two levels of data fidelity - LES and RANS - and we evaluate it in the context of atmospheric flow dispersion. RANS data are obtained by injecting detailed flow information from LES into a lower-fidelity tracer transport equation, in the RANS formalism, using physics-constrained machine learning. There are two steps in our approach: i) dimension reduction is performed using a convolutional autoencoder trained using pre-training, and ii) mapping the uncertain parameters to the autoencoder latent space is obtained using co-kriging and an autoregressive model. We consider a case of a simplified two-dimensional flow configuration around a surface-mounted obstacle, where the main physical quantity of interest is the time-average tracer concentration field and its variability with respect to uncertain atmospheric forcing and emission source location. We show that the multi-fidelity approach achieves increased performance compared to the LES and RANSsingle-fidelity approaches at equivalent computational budget. This is a promising approach to designing an efficient ROM applicable to realistic field-scale atmospheric dispersion cases.</p>
            </abstract>
          </profileDesc>
        </biblFull>
      </listBibl>
    </body>
    <back>
      <listOrg type="structures">
        <org type="laboratory" xml:id="struct-1058131" status="VALID">
          <idno type="IdRef">249749270</idno>
          <idno type="RNSR">201622384R</idno>
          <idno type="ROR">https://ror.org/05t8ct211</idno>
          <orgName>Climat, Environnement, Couplages et Incertitudes [Toulouse]</orgName>
          <orgName type="acronym">CECI</orgName>
          <date type="start">2016-01-01</date>
          <desc>
            <address>
              <addrLine>Toulouse</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://cerfacs.fr/umr-5318-climat-environnement-couplages-et-incertitudes-ceci/</ref>
          </desc>
          <listRelation>
            <relation active="#struct-27660" type="direct"/>
            <relation name="UMR 5318" active="#struct-300045" type="direct"/>
            <relation name="UMR5318" active="#struct-441569" type="direct"/>
          </listRelation>
        </org>
        <org type="laboratory" xml:id="struct-1061259" status="VALID">
          <idno type="IdRef">253160316</idno>
          <idno type="RNSR">202123711L</idno>
          <idno type="ROR">https://ror.org/00rd81916</idno>
          <idno type="Wikidata">Q109620676</idno>
          <orgName>Laboratoire Interdisciplinaire des Sciences du Numérique</orgName>
          <orgName type="acronym">LISN</orgName>
          <date type="start">2021-01-01</date>
          <desc>
            <address>
              <addrLine>Campus Universitaire bât 507Rue du Belvédère91405 Orsay cedexet Campus Universitaire bât 6401 rue Raimond Castaing91190 Gif-sur-Yvette</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.lisn.upsaclay.fr/</ref>
          </desc>
          <listRelation>
            <relation active="#struct-300009" type="direct"/>
            <relation active="#struct-411575" type="direct"/>
            <relation active="#struct-419361" type="direct"/>
            <relation name="UMR9015" active="#struct-441569" type="direct"/>
          </listRelation>
        </org>
        <org type="researchteam" xml:id="struct-1065304" status="VALID">
          <orgName>DAtascience, trAnsition, Fluid instability, contrOl, Turbulence   LISN</orgName>
          <orgName type="acronym">DATAFLOT</orgName>
          <date type="start">2021-01-01</date>
          <desc>
            <address>
              <addrLine>Université Paris-Saclay, Bâtiment 507, 91405 Orsay Cedex</addrLine>
              <country key="FR"/>
            </address>
          </desc>
          <listRelation>
            <relation active="#struct-1061259" type="direct"/>
            <relation active="#struct-300009" type="indirect"/>
            <relation active="#struct-411575" type="indirect"/>
            <relation active="#struct-419361" type="indirect"/>
            <relation name="UMR9015" active="#struct-441569" type="indirect"/>
            <relation active="#struct-1065370" type="direct"/>
          </listRelation>
        </org>
        <org type="institution" xml:id="struct-27660" status="VALID">
          <idno type="IdRef">143868195</idno>
          <idno type="ISNI">0000000406407549</idno>
          <idno type="RNSR">199622827J</idno>
          <orgName>Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique</orgName>
          <orgName type="acronym">CERFACS</orgName>
          <date type="start">1987-01-01</date>
          <desc>
            <address>
              <addrLine>42 Avenue Gaspard Coriolis 31057 TOULOUSE CEDEX 1</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.cerfacs.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300045" status="VALID">
          <idno type="IdRef">029349265</idno>
          <idno type="ISNI">0000 0001 2154 1736</idno>
          <idno type="ROR">https://ror.org/04kdfz702</idno>
          <idno type="Wikidata">Q3152437</idno>
          <orgName>Institut national des sciences de l'Univers</orgName>
          <orgName type="acronym">INSU - CNRS</orgName>
          <date type="start">2007-04-19</date>
          <desc>
            <address>
              <addrLine>INSU-CNRS3 rue Michel-Ange, 75794 Paris Cedex 16</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.insu.cnrs.fr</ref>
          </desc>
        </org>
        <org type="regroupinstitution" xml:id="struct-441569" status="VALID">
          <idno type="IdRef">02636817X</idno>
          <idno type="ISNI">0000000122597504</idno>
          <idno type="ROR">https://ror.org/02feahw73</idno>
          <orgName>Centre National de la Recherche Scientifique</orgName>
          <orgName type="acronym">CNRS</orgName>
          <date type="start">1939-10-19</date>
          <desc>
            <address>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.cnrs.fr/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-300009" status="VALID">
          <idno type="ROR">https://ror.org/02kvxyf05</idno>
          <orgName>Institut National de Recherche en Informatique et en Automatique</orgName>
          <orgName type="acronym">Inria</orgName>
          <desc>
            <address>
              <addrLine>Domaine de VoluceauRocquencourt - BP 10578153 Le Chesnay Cedex</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.inria.fr/en/</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-411575" status="VALID">
          <idno type="IdRef">184443237</idno>
          <idno type="ROR">https://ror.org/019tcpt25</idno>
          <orgName>CentraleSupélec</orgName>
          <desc>
            <address>
              <addrLine>3, rue Joliot Curie,Plateau de Moulon,91192 GIF-SUR-YVETTE Cedex</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">http://www.centralesupelec.fr</ref>
          </desc>
        </org>
        <org type="institution" xml:id="struct-419361" status="VALID">
          <idno type="IdRef">241345251</idno>
          <idno type="ROR">https://ror.org/03xjwb503</idno>
          <orgName>Université Paris-Saclay</orgName>
          <desc>
            <address>
              <addrLine>Bâtiment Bréguet, 3 Rue Joliot Curie 2e ét, 91190 Gif-sur-Yvette</addrLine>
              <country key="FR"/>
            </address>
            <ref type="url">https://www.universite-paris-saclay.fr/fr</ref>
          </desc>
        </org>
        <org type="department" xml:id="struct-1065370" status="VALID">
          <orgName>Mécanique-Energétique</orgName>
          <orgName type="acronym">M.-E.</orgName>
          <date type="start">2021-01-01</date>
          <desc>
            <address>
              <country key="FR"/>
            </address>
          </desc>
          <listRelation>
            <relation active="#struct-1061259" type="direct"/>
            <relation active="#struct-300009" type="indirect"/>
            <relation active="#struct-411575" type="indirect"/>
            <relation active="#struct-419361" type="indirect"/>
            <relation name="UMR9015" active="#struct-441569" type="indirect"/>
          </listRelation>
        </org>
      </listOrg>
    </back>
  </text>
</TEI>