<filename>python/1bCreateFullArticleData_APS/APS-data/PRFLUIDS/1/PhysRevFluids.1.074301.json
{"id":"10.1103/PhysRevFluids.1.074301","title":{"value":"Turbulent transport and entrainment in jets and plumes: A DNS study","format":"html+mathml"},"publisher":{"name":"APS"},"journal":{"id":"PRFLUIDS","abbreviatedName":"Phys. Rev. Fluids","name":"Physical Review Fluids"},"issue":{"number":"7"},"volume":{"number":"1"},"pageStart":"074301","hasArticleId":true,"date":"2016-11-07","numPages":25,"articleType":"article","identifiers":{"doi":"10.1103/PhysRevFluids.1.074301"},"rights":{"rightsStatement":"©2016 American Physical Society","copyrightYear":2016,"copyrightHolders":[{"name":"American Physical Society"}]},"authors":[{"type":"Person","name":"<NAME>","firstname":"Maarten","surname":"<NAME>","affiliationIds":["a1"]},{"type":"Person","name":"<NAME>","firstname":"Pietro","surname":"Salizzoni","affiliationIds":["a2"]},{"type":"Person","name":"<NAME>","firstname":"<NAME>.","surname":"Hunt","affiliationIds":["a3"]},{"type":"Person","name":"<NAME>","firstname":"John","surname":"Craske","affiliationIds":["a4"]}],"affiliations":[{"id":"a1","name":"Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United Kingdom"},{"id":"a2","name":"Laboratoire de Mécanique des Fluides et d'Acoustique, University of Lyon, CNRS UMR No. 5509, Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard, 36 Avenue Guy de Collongue, 69134 Ecully, France"},{"id":"a3","name":"Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom"},{"id":"a4","name":"Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United Kingdom"}],"abstract":{"value":"<p>We present a direct numerical simulation (DNS) data set for a statistically axisymmetric turbulent jet, plume, and forced plume in a domain of size <span class=\"aps-inline-formula\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>40</mn><msub><mi>r</mi><mn>0</mn></msub><mo>×</mo><mn>40</mn><msub><mi>r</mi><mn>0</mn></msub><mo>×</mo><mn>60</mn><msub><mi>r</mi><mn>0</mn></msub></mrow></math></span>, where <span class=\"aps-inline-formula\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>r</mi><mn>0</mn></msub></math></span> is the source diameter. The data set supports the validity of the Priestley-Ball entrainment model in unstratified environments (excluding the region near the source) [Priestley and Ball, <a href=\"http://dx.doi.org/10.1002/qj.49708134803\"><span>Q. J. R. Meteor. Soc.</span> <b>81</b>, 144 (1955)</a>], which is corroborated further by the Wang-Law and Ezzamel <i>et al.</i> experimental data sets [Wang and Law, <a href=\"http://dx.doi.org/10.1017/S0022112002008157\"><span>J. Fluid Mech.</span> <b>459</b>, 397 (2002)</a>; Ezzamel  <i>et al.</i>, <a href=\"http://dx.doi.org/10.1017/jfm.2014.694\"><span>J. Fluid Mech.</span> <b>765</b>, 576 (2015)</a>], the latter being corrected for a small but influential coflow that affected the statistics. We show that the second-order turbulence statistics in the core region of the jet and the plume are practically indistinguishable from each other, although there are significant differences near the plume edge. The DNS data indicate that the turbulent Prandtl number is about 0.7 for both jets and plumes. For plumes, this value is a result of the difference in the ratio of the radial turbulent transport of radial momentum and buoyancy. For jets, however, the value originates from a different spread of the buoyancy and velocity profiles, in spite of the fact that the ratio of radial turbulent transport terms is approximately unity. The DNS data do not show any evidence of similarity drift associated with gradual variations in the ratio of buoyancy profile to velocity profile widths.</p>","format":"html+mathml"},"classificationSchemes":{"physh":{"disciplines":[{"id":"512fd433-7b6d-4535-bb60-78f3bf431bc3","label":"Fluid Dynamics"}],"concepts":[{"id":"2d276ce6-c803-4ba3-813c-b989f2d4bfde","label":"Convection & buoyancy-driven flows","facet":{"id":"bdb1ef91-b776-4e36-8f8f-3e93666bac1e","label":"Research Areas"}},{"id":"062f0300c33d4782b24c43996b0469f3","label":"Turbulence","facet":{"id":"bdb1ef91-b776-4e36-8f8f-3e93666bac1e","label":"Research Areas"}},{"id":"4c984e2a-a745-480a-8a33-f96574b3bf03","label":"Wakes & jets","facet":{"id":"bdb1ef91-b776-4e36-8f8f-3e93666bac1e","label":"Research Areas"},"primary":true}]}}}