Large-eddy simulations of a supersonic impinging jet using OpenFOAM
Supersonic impinging jets are a versatile configuration that can model the compressible flows of cold-spray manufacturing and vertical take-off-and landing strategy. In this work, rhoCentralFoam, solver of the OpenFOAM framework, and a large-eddy simulation formulation were used to simulate an under...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/178850 |
| _version_ | 1826118707543277568 |
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| author | You, Rion Guang Yi New, Tze How Chan, Wai Lee |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering You, Rion Guang Yi New, Tze How Chan, Wai Lee |
| author_sort | You, Rion Guang Yi |
| collection | NTU |
| description | Supersonic impinging jets are a versatile configuration that can model the compressible flows of cold-spray manufacturing and vertical take-off-and landing strategy. In this work, rhoCentralFoam, solver of the OpenFOAM framework, and a large-eddy simulation formulation were used to simulate an underexpanded supersonic jet of Mach (Formula presented.) and nozzle pressure ratio of 4, impinging on a flat wall situated at (Formula presented.) nozzle diameters away from the jet outlet. Care was taken in the mesh construction to properly capture the characteristic standoff shock and vortical structures. The grid convergence index was evaluated with three meshes of increasing spatial resolution. All meshes can generally be considered as sufficient in terms of results focused on time-averaged values and mean physical properties such as centerline Mach number profile. However, the highest resolution mesh was found to capture fine shear vortical structures and behaviors that are absent in the coarser cases. Therefore, the notion of adequate grid convergence may differ between analyses of time-averaged and transient information, and so should be determined by the user’s intention for conducting the simulations. To guide the selection of mesh resolution, scaling analyses were performed, for which the current rhoCentralFoam solver displays a good weak scaling performance and maintains a linear strong scaling up to 4096 cores (32 nodes) for an approximately 40 million-cell mesh. Due to the internode communication bottlenecks of OpenFOAM and improvements in central processing units, this work recommends, for future scaling analyses, adopting a “cells-per-node” basis over the conventional “cells-per-core” basis, with particular attention to the interconnect speed and architecture used. |
| first_indexed | 2024-10-01T04:47:52Z |
| format | Journal Article |
| id | ntu-10356/178850 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:47:52Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1788502024-08-19T09:05:32Z Large-eddy simulations of a supersonic impinging jet using OpenFOAM You, Rion Guang Yi New, Tze How Chan, Wai Lee School of Mechanical and Aerospace Engineering Engineering Supersonic impinging jets Large-eddy simulations Supersonic impinging jets are a versatile configuration that can model the compressible flows of cold-spray manufacturing and vertical take-off-and landing strategy. In this work, rhoCentralFoam, solver of the OpenFOAM framework, and a large-eddy simulation formulation were used to simulate an underexpanded supersonic jet of Mach (Formula presented.) and nozzle pressure ratio of 4, impinging on a flat wall situated at (Formula presented.) nozzle diameters away from the jet outlet. Care was taken in the mesh construction to properly capture the characteristic standoff shock and vortical structures. The grid convergence index was evaluated with three meshes of increasing spatial resolution. All meshes can generally be considered as sufficient in terms of results focused on time-averaged values and mean physical properties such as centerline Mach number profile. However, the highest resolution mesh was found to capture fine shear vortical structures and behaviors that are absent in the coarser cases. Therefore, the notion of adequate grid convergence may differ between analyses of time-averaged and transient information, and so should be determined by the user’s intention for conducting the simulations. To guide the selection of mesh resolution, scaling analyses were performed, for which the current rhoCentralFoam solver displays a good weak scaling performance and maintains a linear strong scaling up to 4096 cores (32 nodes) for an approximately 40 million-cell mesh. Due to the internode communication bottlenecks of OpenFOAM and improvements in central processing units, this work recommends, for future scaling analyses, adopting a “cells-per-node” basis over the conventional “cells-per-core” basis, with particular attention to the interconnect speed and architecture used. Ministry of Education (MOE) Published version This research is funded by Singapore Ministry of Education AcRF Tier 1 Project # RG67/22. 2024-07-09T03:16:30Z 2024-07-09T03:16:30Z 2024 Journal Article You, R. G. Y., New, T. H. & Chan, W. L. (2024). Large-eddy simulations of a supersonic impinging jet using OpenFOAM. Computation, 12(6), 124-. https://dx.doi.org/10.3390/computation12060124 2079-3197 https://hdl.handle.net/10356/178850 10.3390/computation12060124 2-s2.0-85196811119 6 12 124 en RG67/22 Computation 10.21979/N9/NDJUSJ © 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). application/pdf |
| spellingShingle | Engineering Supersonic impinging jets Large-eddy simulations You, Rion Guang Yi New, Tze How Chan, Wai Lee Large-eddy simulations of a supersonic impinging jet using OpenFOAM |
| title | Large-eddy simulations of a supersonic impinging jet using OpenFOAM |
| title_full | Large-eddy simulations of a supersonic impinging jet using OpenFOAM |
| title_fullStr | Large-eddy simulations of a supersonic impinging jet using OpenFOAM |
| title_full_unstemmed | Large-eddy simulations of a supersonic impinging jet using OpenFOAM |
| title_short | Large-eddy simulations of a supersonic impinging jet using OpenFOAM |
| title_sort | large eddy simulations of a supersonic impinging jet using openfoam |
| topic | Engineering Supersonic impinging jets Large-eddy simulations |
| url | https://hdl.handle.net/10356/178850 |
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