A mass-conserving, cut-cell method to simulate scour formation with vertical Cartesian coordinates
Abstract/Contents
- Abstract
- Scour is the primary cause of bridge failures in the United States and accurate field-scale simulations of scour are required for bridge stability analysis. In current bridge design practice, empirical equations based on laboratory flume tests are utilized to determine scour depth. These equations have been proven to be conservative due to scale effects when applied to field-scale scour conditions. Therefore, computational fluid dynamics (CFD) solvers have been utilized to simulate flow behavior around bridge piers. However, the majority of current CFD solvers do not accurately estimate the large-scale scour depth in field conditions, and mass conservation during scour is typically not satisfied. Therefore, a new CFD solver is proposed in this dissertation with new features including a moving-bed, cut-cell model, and mass-conservative sediment transport. The new moving-bed cut-cell model is based on a Cartesian grid system in the vertical coordinate (z-coordinate), and the bed depth is defined at vertices of the unstructured horizontal mesh. This discourages discontinuities in the bed and allows a more accurate representation of the bathymetry. The new model ensures that the total sediment mass within the bed and flow is conserved during bed movement and sediment transport. The proposed three-dimensional (3D), moving-bed and mass-conserved CFD solver has been applied to various scour studies and validated with flume tests in terms of flow velocity and scour patterns. The moving-bed cut-cell model provides accurate, continuous, and smooth simulation of the flow field and scour patterns and has been validated with the results of several experiments.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Chen, Wenhao |
|---|---|
| Degree supervisor | Billington, Sarah |
| Degree supervisor | Fringer, Oliver B. (Oliver Bartlett) |
| Thesis advisor | Billington, Sarah |
| Thesis advisor | Fringer, Oliver B. (Oliver Bartlett) |
| Thesis advisor | Freyberg, David L |
| Degree committee member | Freyberg, David L |
| Associated with | Stanford University, Civil & Environmental Engineering Department |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Wenhao Chen. |
|---|---|
| Note | Submitted to the Civil & Environmental Engineering Department. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/rh488yh0972 |
Access conditions
- Copyright
- © 2021 by Wenhao Chen
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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