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| DOI | 10.1016/j.advwatres.2019.103465 |
| On modeling subgrid-scale macro-structures in narrow twisted channels | |
| Li Z.; Hodges B.R. | |
| 发表日期 | 2020 |
| ISSN | 0309-1708 |
| 卷号 | 135 |
| 英文摘要 | Porosity-based subgrid topography models often fail to capture the effects of subgrid-scale topographic features in the interior of coarse grid cells. Existing approaches that modify bottom roughness or a drag coefficient are inadequate for macro-structures (large emergent or submerged obstacles) in subgrid-scale narrow twisted channels. Such structures partially block the cross-sectional area and provide enhanced topographic dissipation – effects that are not well represented by a drag coefficient that scales on a coarse-grid cell-averaged velocity and the cell volume. The relative alignment between mesh and flow further complicates this problem as it makes the subgrid model sensitive to mesh design. In the present study, three new approaches for simulating subgrid-scale macro-structures in narrow channels are proposed. The interior partial-blocking effect of structures is modeled as reduction of grid face-area. The sheltering of flow volumes around obstacles, which leads to topographic dissipation, is modeled by reducing the cell volume in the momentum equation (only). A mesh-shift procedure is designed to optimize mesh alignment for identifiable subgrid features. Combining the three subgrid methods improves the approximation of surface elevation and in-channel flow rate with a coarse-grid model. Tests are conducted for channelized flow using both synthetic domains and real marsh topography. The new methods reduce the overall mesh dependency of the subgrid model and provides stronger physical connection between effects of macro-structures and their geometry at coarse grid scales. © 2019 Elsevier Ltd |
| 关键词 | CellsCytologyDragDrag coefficientMesh generationCross sectional areaGrid alignmentMacrostructuresNarrow twisted channelPhysical connectionsSubmerged obstaclesTopographic featuresTopography modelsTopographychannel flowdissipationdrag coefficientgeometrymomentumporositytopography |
| 语种 | 英语 |
| 来源机构 | Advances in Water Resources |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/131892 |
| 推荐引用方式 GB/T 7714 | Li Z.,Hodges B.R.. On modeling subgrid-scale macro-structures in narrow twisted channels[J]. Advances in Water Resources,2020,135. |
| APA | Li Z.,&Hodges B.R..(2020).On modeling subgrid-scale macro-structures in narrow twisted channels.,135. |
| MLA | Li Z.,et al."On modeling subgrid-scale macro-structures in narrow twisted channels".135(2020). |
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