On the Combined Effects of Turbulence and Gravity on Droplet Collisions in Clouds: A Numerical Study
This paper examines the combined influences of turbulence and gravity on droplet collision statistics in turbulent clouds by means of direct numerical simulation (DNS). The essential microphysical mechanisms that determine the geometric collision kernel are explored by studying how gravity affects d...
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| Veröffentlicht in: | Journal of the atmospheric sciences 2009-07, Vol.66 (7), p.1926-1943 |
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| container_end_page | 1943 |
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| container_issue | 7 |
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| container_title | Journal of the atmospheric sciences |
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| creator | WOITTIEZ, Eric J. P JONKER, Harm J. J PORTELA, Luis M |
| description | This paper examines the combined influences of turbulence and gravity on droplet collision statistics in turbulent clouds by means of direct numerical simulation (DNS). The essential microphysical mechanisms that determine the geometric collision kernel are explored by studying how gravity affects droplet relative velocities and preferential concentration of both monodisperse and bidisperse droplet distributions. To this end, collision statistics of large amounts of droplets with radii ranging from 10 to 90 μm, driven by a turbulent flow field and gravity, are calculated. The flow is homogeneous and isotropic and has a dissipation rate of ε = 4.25 × 10−2 m2 s−3. The results show that in the calculation of collision statistics, the interplay between gravity and turbulence is an essential element and not merely an addition of separate phenomena. For example, the presence of gravity leads to clustering of large droplets interacting with the larger scales of turbulence in the DNS. The collision statistics of a bidisperse droplet distribution, even with a very small radius difference, shows profoundly different behavior than the monodisperse case. |
| doi_str_mv | 10.1175/2005jas2669.1 |
| format | Article |
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P ; JONKER, Harm J. J ; PORTELA, Luis M</creator><creatorcontrib>WOITTIEZ, Eric J. P ; JONKER, Harm J. J ; PORTELA, Luis M</creatorcontrib><description>This paper examines the combined influences of turbulence and gravity on droplet collision statistics in turbulent clouds by means of direct numerical simulation (DNS). The essential microphysical mechanisms that determine the geometric collision kernel are explored by studying how gravity affects droplet relative velocities and preferential concentration of both monodisperse and bidisperse droplet distributions. To this end, collision statistics of large amounts of droplets with radii ranging from 10 to 90 μm, driven by a turbulent flow field and gravity, are calculated. The flow is homogeneous and isotropic and has a dissipation rate of ε = 4.25 × 10−2 m2 s−3. The results show that in the calculation of collision statistics, the interplay between gravity and turbulence is an essential element and not merely an addition of separate phenomena. For example, the presence of gravity leads to clustering of large droplets interacting with the larger scales of turbulence in the DNS. The collision statistics of a bidisperse droplet distribution, even with a very small radius difference, shows profoundly different behavior than the monodisperse case.</description><identifier>ISSN: 0022-4928</identifier><identifier>EISSN: 1520-0469</identifier><identifier>DOI: 10.1175/2005jas2669.1</identifier><identifier>CODEN: JAHSAK</identifier><language>eng</language><publisher>Boston, MA: American Meteorological Society</publisher><subject>Atoms & subatomic particles ; Cloud droplet collision ; Clouds ; Clustering ; Collision dynamics ; Collisions ; Direct numerical simulation ; Droplets ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Gravity ; Mathematical analysis ; Mathematical models ; Meteorology ; Numerical simulations ; Physics of the high neutral atmosphere ; Reynolds number ; Statistical methods ; Statistics ; Turbulence ; Turbulent flow ; Velocity ; Virtual reality</subject><ispartof>Journal of the atmospheric sciences, 2009-07, Vol.66 (7), p.1926-1943</ispartof><rights>2009 INIST-CNRS</rights><rights>Copyright American Meteorological Society Jul 2009</rights><rights>Copyright American Meteorological Society 2009</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c533t-4e4c1285176497c0a16003c47d88388cb2772dd1e4d3820ab891fb32100f88833</citedby><cites>FETCH-LOGICAL-c533t-4e4c1285176497c0a16003c47d88388cb2772dd1e4d3820ab891fb32100f88833</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785,3682,27928,27929</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21826236$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>WOITTIEZ, Eric J. P</creatorcontrib><creatorcontrib>JONKER, Harm J. J</creatorcontrib><creatorcontrib>PORTELA, Luis M</creatorcontrib><title>On the Combined Effects of Turbulence and Gravity on Droplet Collisions in Clouds: A Numerical Study</title><title>Journal of the atmospheric sciences</title><description>This paper examines the combined influences of turbulence and gravity on droplet collision statistics in turbulent clouds by means of direct numerical simulation (DNS). The essential microphysical mechanisms that determine the geometric collision kernel are explored by studying how gravity affects droplet relative velocities and preferential concentration of both monodisperse and bidisperse droplet distributions. To this end, collision statistics of large amounts of droplets with radii ranging from 10 to 90 μm, driven by a turbulent flow field and gravity, are calculated. The flow is homogeneous and isotropic and has a dissipation rate of ε = 4.25 × 10−2 m2 s−3. The results show that in the calculation of collision statistics, the interplay between gravity and turbulence is an essential element and not merely an addition of separate phenomena. For example, the presence of gravity leads to clustering of large droplets interacting with the larger scales of turbulence in the DNS. The collision statistics of a bidisperse droplet distribution, even with a very small radius difference, shows profoundly different behavior than the monodisperse case.</description><subject>Atoms & subatomic particles</subject><subject>Cloud droplet collision</subject><subject>Clouds</subject><subject>Clustering</subject><subject>Collision dynamics</subject><subject>Collisions</subject><subject>Direct numerical simulation</subject><subject>Droplets</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Gravity</subject><subject>Mathematical analysis</subject><subject>Mathematical models</subject><subject>Meteorology</subject><subject>Numerical simulations</subject><subject>Physics of the high neutral atmosphere</subject><subject>Reynolds number</subject><subject>Statistical methods</subject><subject>Statistics</subject><subject>Turbulence</subject><subject>Turbulent flow</subject><subject>Velocity</subject><subject>Virtual reality</subject><issn>0022-4928</issn><issn>1520-0469</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqF0c1vFCEYBnDSaNK1euydaPQ2FV4YYLxt1n6msYfW84QBJmXDwgozTfa_l7GNhyZGLlx-78PHg9ApJWeUyvYrENJudQEhujN6hFa0BdIQLro3aEUIQMM7UMfoXSlbUhdIukL2LuLp0eFN2g0-OovPx9GZqeA04oc5D3Nw0Tiso8WXWT_56YBTxN9z2gc31akQfPEpFuwj3oQ02_INr_GPeeeyNzrg-2m2h_fo7ahDcR9e9hP08-L8YXPV3N5dXm_Wt41pGZsa7rihoFoqBe-kIZoKQpjh0irFlDIDSAnWUsctU0D0oDo6DgwoIaOqhJ2gL8-5-5x-za5M_c4X40LQ0aW59IxLpUQn_wuBSFkPpxV-egW3ac6xPqKHeoVOAf-jPv5TMcFbKcSCmmdkciolu7HfZ7_T-dBT0i_99Ut_N-v7pb9-8Z9fQnWpPzlmHY0vf4eAKhA1nf0GJSGWyQ</recordid><startdate>20090701</startdate><enddate>20090701</enddate><creator>WOITTIEZ, Eric J. 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| identifier | ISSN: 0022-4928 |
| ispartof | Journal of the atmospheric sciences, 2009-07, Vol.66 (7), p.1926-1943 |
| issn | 0022-4928 1520-0469 |
| language | eng |
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| source | American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Atoms & subatomic particles Cloud droplet collision Clouds Clustering Collision dynamics Collisions Direct numerical simulation Droplets Earth, ocean, space Exact sciences and technology External geophysics Gravity Mathematical analysis Mathematical models Meteorology Numerical simulations Physics of the high neutral atmosphere Reynolds number Statistical methods Statistics Turbulence Turbulent flow Velocity Virtual reality |
| title | On the Combined Effects of Turbulence and Gravity on Droplet Collisions in Clouds: A Numerical Study |
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