Moderately stable flow over a three‐dimensional hill A comparison of linear theory with laboratory measurements
ABSTRACT Several series of experiments were performed in a stratified towing tank to study the near‐field flow of a linearly stratified fluid over an isolated three‐dimensional hill. Streamlines were obtained in the laboratory using a stereographic method to determine the paths of plumes of dye rele...
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| Veröffentlicht in: | Tellus. Series A, Dynamic meteorology and oceanography Dynamic meteorology and oceanography, 1991-01, Vol.43 (1), p.49-63 |
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| container_title | Tellus. Series A, Dynamic meteorology and oceanography |
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| creator | THOMPSON, ROGER S. SHIPMAN, MICHAEL S. ROTTMAN, JAMES W. |
| description | ABSTRACT
Several series of experiments were performed in a stratified towing tank to study the near‐field flow of a linearly stratified fluid over an isolated three‐dimensional hill. Streamlines were obtained in the laboratory using a stereographic method to determine the paths of plumes of dye released upstream of the hill. Velocities over the hill centre were obtained by analysis of video recordings of dye plumes and with a propeller anemometer. The results of these experiments are compared with numerical solutions, computed using Fast Fourier Transforms, of the linearized equations of motion for an inviscid fluid. Numerical solutions were obtained using two different upper boundary conditions: one represents flow in a fluid of infinite depth and the other flow in a fluid of finite depth. Near the hill surface, the predicted streamline deflections were quite similar in both cases except for Froude numbers close to one in the lee of the hill. Good agreement with the measurements is found for Froude numbers (based on the hill height) greater than about 2.0. For Froude numbers greater than about 4.0, flow patterns were observed to differ only slightly from those for neutral flow. |
| doi_str_mv | 10.1034/j.1600-0870.1991.00005.x |
| format | Article |
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Several series of experiments were performed in a stratified towing tank to study the near‐field flow of a linearly stratified fluid over an isolated three‐dimensional hill. Streamlines were obtained in the laboratory using a stereographic method to determine the paths of plumes of dye released upstream of the hill. Velocities over the hill centre were obtained by analysis of video recordings of dye plumes and with a propeller anemometer. The results of these experiments are compared with numerical solutions, computed using Fast Fourier Transforms, of the linearized equations of motion for an inviscid fluid. Numerical solutions were obtained using two different upper boundary conditions: one represents flow in a fluid of infinite depth and the other flow in a fluid of finite depth. Near the hill surface, the predicted streamline deflections were quite similar in both cases except for Froude numbers close to one in the lee of the hill. Good agreement with the measurements is found for Froude numbers (based on the hill height) greater than about 2.0. For Froude numbers greater than about 4.0, flow patterns were observed to differ only slightly from those for neutral flow.</description><identifier>ISSN: 0280-6495</identifier><identifier>EISSN: 1600-0870</identifier><identifier>DOI: 10.1034/j.1600-0870.1991.00005.x</identifier><identifier>CODEN: TSAOD8</identifier><language>eng</language><publisher>Copenhagen, DK: Blackwell Munksgaard</publisher><subject>Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Geophysics. Techniques, methods, instrumentation and models</subject><ispartof>Tellus. Series A, Dynamic meteorology and oceanography, 1991-01, Vol.43 (1), p.49-63</ispartof><rights>1992 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2895-4068bd310bca01cabba49d058a881f2fbdbe11b9829bb3861a7c47a6ad83f0b33</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1034%2Fj.1600-0870.1991.00005.x$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1034%2Fj.1600-0870.1991.00005.x$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,4024,27923,27924,27925,45574,45575</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=5042300$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>THOMPSON, ROGER S.</creatorcontrib><creatorcontrib>SHIPMAN, MICHAEL S.</creatorcontrib><creatorcontrib>ROTTMAN, JAMES W.</creatorcontrib><title>Moderately stable flow over a three‐dimensional hill A comparison of linear theory with laboratory measurements</title><title>Tellus. Series A, Dynamic meteorology and oceanography</title><description>ABSTRACT
Several series of experiments were performed in a stratified towing tank to study the near‐field flow of a linearly stratified fluid over an isolated three‐dimensional hill. Streamlines were obtained in the laboratory using a stereographic method to determine the paths of plumes of dye released upstream of the hill. Velocities over the hill centre were obtained by analysis of video recordings of dye plumes and with a propeller anemometer. The results of these experiments are compared with numerical solutions, computed using Fast Fourier Transforms, of the linearized equations of motion for an inviscid fluid. Numerical solutions were obtained using two different upper boundary conditions: one represents flow in a fluid of infinite depth and the other flow in a fluid of finite depth. Near the hill surface, the predicted streamline deflections were quite similar in both cases except for Froude numbers close to one in the lee of the hill. Good agreement with the measurements is found for Froude numbers (based on the hill height) greater than about 2.0. For Froude numbers greater than about 4.0, flow patterns were observed to differ only slightly from those for neutral flow.</description><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Geophysics. Techniques, methods, instrumentation and models</subject><issn>0280-6495</issn><issn>1600-0870</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1991</creationdate><recordtype>article</recordtype><recordid>eNqNkLFu2zAQhomiBeKmeQcORTc5R1GSqaWAEaRpABdd0pk4UieYBiU6pFzHWx4hz9gnKVUHmcvleMfvfgIfY1zAUoCsrndL0QAUoFZ50LZiCfnUy6d3bPH28J4toFRQNFVbX7CPKe0yI9pGLtjjj9BRxIn8iacJjSfe-3Dk4TdFjnzaRqI_zy-dG2hMLozo-dZ5z9fchmGP0aUw8tBz70bCmHkK8cSPbtpyjybk5LkfCNMhUs6Y0if2oUef6Oq1XrJf324fbr4Xm5939zfrTWFL1dZFBY0ynRRgLIKwaAxWbQe1QqVEX_amMySEaVXZGiNVI3BlqxU22CnZg5Hykn055-5jeDxQmvTgkiXvcaRwSFqosgYh2wyqM2hjSClSr_fRDRhPWoCeHeudnlXqWaWeHet_jvVTXv38-gcmi76POFqX3vZrqEoJkLGvZ-zoPJ3-O14_3G7W81X-BVj2kvo</recordid><startdate>199101</startdate><enddate>199101</enddate><creator>THOMPSON, ROGER S.</creator><creator>SHIPMAN, MICHAEL S.</creator><creator>ROTTMAN, JAMES W.</creator><general>Blackwell Munksgaard</general><general>Blackwell</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>199101</creationdate><title>Moderately stable flow over a three‐dimensional hill A comparison of linear theory with laboratory measurements</title><author>THOMPSON, ROGER S. ; SHIPMAN, MICHAEL S. ; ROTTMAN, JAMES W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2895-4068bd310bca01cabba49d058a881f2fbdbe11b9829bb3861a7c47a6ad83f0b33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Geophysics. Techniques, methods, instrumentation and models</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>THOMPSON, ROGER S.</creatorcontrib><creatorcontrib>SHIPMAN, MICHAEL S.</creatorcontrib><creatorcontrib>ROTTMAN, JAMES W.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Tellus. Series A, Dynamic meteorology and oceanography</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>THOMPSON, ROGER S.</au><au>SHIPMAN, MICHAEL S.</au><au>ROTTMAN, JAMES W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Moderately stable flow over a three‐dimensional hill A comparison of linear theory with laboratory measurements</atitle><jtitle>Tellus. Series A, Dynamic meteorology and oceanography</jtitle><date>1991-01</date><risdate>1991</risdate><volume>43</volume><issue>1</issue><spage>49</spage><epage>63</epage><pages>49-63</pages><issn>0280-6495</issn><eissn>1600-0870</eissn><coden>TSAOD8</coden><abstract>ABSTRACT
Several series of experiments were performed in a stratified towing tank to study the near‐field flow of a linearly stratified fluid over an isolated three‐dimensional hill. Streamlines were obtained in the laboratory using a stereographic method to determine the paths of plumes of dye released upstream of the hill. Velocities over the hill centre were obtained by analysis of video recordings of dye plumes and with a propeller anemometer. The results of these experiments are compared with numerical solutions, computed using Fast Fourier Transforms, of the linearized equations of motion for an inviscid fluid. Numerical solutions were obtained using two different upper boundary conditions: one represents flow in a fluid of infinite depth and the other flow in a fluid of finite depth. Near the hill surface, the predicted streamline deflections were quite similar in both cases except for Froude numbers close to one in the lee of the hill. Good agreement with the measurements is found for Froude numbers (based on the hill height) greater than about 2.0. For Froude numbers greater than about 4.0, flow patterns were observed to differ only slightly from those for neutral flow.</abstract><cop>Copenhagen, DK</cop><pub>Blackwell Munksgaard</pub><doi>10.1034/j.1600-0870.1991.00005.x</doi><tpages>15</tpages></addata></record> |
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| source | Taylor & Francis Open Access; Co-Action Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Wiley Online Library All Journals; Alma/SFX Local Collection |
| subjects | Earth, ocean, space Exact sciences and technology External geophysics Geophysics. Techniques, methods, instrumentation and models |
| title | Moderately stable flow over a three‐dimensional hill A comparison of linear theory with laboratory measurements |
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