Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow
The present study investigates the turbulent hydrodynamics in an open channel flow with an emergent and sparse vegetation patch placed in the middle of the channel. The dimensions of the rigid vegetation patch are 81 cm long and 24 cm wide and it is prepared by a 7× 10 array of uniform acrylic cylind...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2016-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=41389&issue_ID=237 |
| _version_ | 1818083755498143744 |
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| author | Soumen Maji Debasish Pal Prashanth Reddy Hanmaiahgari Jaan Hui Pu |
| author_facet | Soumen Maji Debasish Pal Prashanth Reddy Hanmaiahgari Jaan Hui Pu |
| author_sort | Soumen Maji |
| collection | DOAJ |
| description | The present study investigates the turbulent hydrodynamics in an open channel flow with an emergent and sparse vegetation patch placed in the middle of the channel. The dimensions of the rigid vegetation patch are 81 cm long and 24 cm wide and it is prepared by a 7× 10 array of uniform acrylic cylinders by maintaining 9 cm and 4 cm spacing between centers of two consecutive cylinders along streamwise and lateral directions respectively. From the leading edge of the patch, the observed nature of time averaged flow velocities along streamwise, lateral and vertical directions is not consistent up to half length of the patch; however the velocity profiles develop a uniform behavior after that length. In the interior of the patch, the magnitude of vertical normal stress is small in comparison to the magnitudes of streamwise and lateral normal stresses. The magnitude of Reynolds shear stress profiles decreases with increasing downstream length from the leading edge of the vegetation patch and the trend continues even in the wake region downstream of the trailing edge. The increased magnitude of turbulent kinetic energy profiles is noticed from leading edge up to a certain length inside the patch; however its value decreases with further increasing downstream distance. A new mathematical model is proposed to predict time averaged streamwise velocity inside the sparse vegetation patch and the proposed model shows good agreement with the experimental data. |
| first_indexed | 2024-12-10T19:43:02Z |
| format | Article |
| id | doaj.art-417ceb3f9f41462394d7e91fa403efe6 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-10T19:43:02Z |
| publishDate | 2016-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-417ceb3f9f41462394d7e91fa403efe62022-12-22T01:35:58ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722016-01-019628652875.Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel FlowSoumen Maji0Debasish Pal1Prashanth Reddy Hanmaiahgari2Jaan Hui Pu3IIT KharagpurIndian Institute of Technology KharagpurIIT KharagpurUniversity of Bradford, UKThe present study investigates the turbulent hydrodynamics in an open channel flow with an emergent and sparse vegetation patch placed in the middle of the channel. The dimensions of the rigid vegetation patch are 81 cm long and 24 cm wide and it is prepared by a 7× 10 array of uniform acrylic cylinders by maintaining 9 cm and 4 cm spacing between centers of two consecutive cylinders along streamwise and lateral directions respectively. From the leading edge of the patch, the observed nature of time averaged flow velocities along streamwise, lateral and vertical directions is not consistent up to half length of the patch; however the velocity profiles develop a uniform behavior after that length. In the interior of the patch, the magnitude of vertical normal stress is small in comparison to the magnitudes of streamwise and lateral normal stresses. The magnitude of Reynolds shear stress profiles decreases with increasing downstream length from the leading edge of the vegetation patch and the trend continues even in the wake region downstream of the trailing edge. The increased magnitude of turbulent kinetic energy profiles is noticed from leading edge up to a certain length inside the patch; however its value decreases with further increasing downstream distance. A new mathematical model is proposed to predict time averaged streamwise velocity inside the sparse vegetation patch and the proposed model shows good agreement with the experimental data.http://jafmonline.net/JournalArchive/download?file_ID=41389&issue_ID=237Open channel flow; Turbulence; Sparse vegetation; Hydrodynamics. |
| spellingShingle | Soumen Maji Debasish Pal Prashanth Reddy Hanmaiahgari Jaan Hui Pu Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow Journal of Applied Fluid Mechanics Open channel flow; Turbulence; Sparse vegetation; Hydrodynamics. |
| title | Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow |
| title_full | Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow |
| title_fullStr | Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow |
| title_full_unstemmed | Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow |
| title_short | Phenomenological Features of Turbulent Hydrodynamics in Sparsely Vegetated Open Channel Flow |
| title_sort | phenomenological features of turbulent hydrodynamics in sparsely vegetated open channel flow |
| topic | Open channel flow; Turbulence; Sparse vegetation; Hydrodynamics. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=41389&issue_ID=237 |
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