Numerical Modeling of Flow and Local Scour around Pipeline in Steady Currents Using Moving Mesh with Masked Elements
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 5
Abstract
This work reports on a computational fluid dynamics (CFD) model for flow and local scour around a pipeline in steady currents that uses a mixed moving-mesh and fixed-grid method. It performs mesh motions for bed conforming without considering the pipeline and then simulates the pipeline with a fixed-grid approach after the mesh motion process has been completed. The proposed model combines the best properties of the boundary-fitted-grid and fixed-grid methods. In contrast to previous boundary-fitted-grid models, the present model uses masked elements to resolve the effects of a stationary object on the flow and sediment scour processes. This approach makes it possible to track directly the moving fluid–sediment interface using a very simple mesh setup, which is more practical for engineering computations than the existing models. The modeled results are compared to published laboratory measurements as well as to previous numerical predictions obtained by other models. The results show that the proposed model satisfactorily reproduces the features of the local scour observed in the experiments and thus can be a promising tool for modeling flow and sediment scour problems.
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Data Availability Statement
Some or all data, models, or code generated or used during the study, including the experimental data, the numerical results, and the OpenFOAM files, are available from the corresponding author by request.
Acknowledgments
This work was funded partially by the Natural Sciences and Engineering Research Council of Canada (NSERC Discovery Grants). The first author is a recipient of a scholarship from the China Scholarship Council (CSC).
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©2020 American Society of Civil Engineers.
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Received: Apr 25, 2019
Accepted: Oct 28, 2019
Published online: Feb 29, 2020
Published in print: May 1, 2020
Discussion open until: Jul 29, 2020
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