An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena
The multiscale multiphase flow contains both small-scale (dispersed phase) and large-scale (continuous phase) structures. Standard interface-averaging multiphase models are appropriate for the simulation of flows including small-scale structures. Standard interface-resolving multiphase models are co...
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2022-07-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2050_9c261d181f16d625b9b7d81431786d9c.pdf |
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| author | M. M. Noroozi R. Maddahian M. H. Ramezani M. R. Ansari |
| author_facet | M. M. Noroozi R. Maddahian M. H. Ramezani M. R. Ansari |
| author_sort | M. M. Noroozi |
| collection | DOAJ |
| description | The multiscale multiphase flow contains both small-scale (dispersed phase) and large-scale (continuous phase) structures. Standard interface-averaging multiphase models are appropriate for the simulation of flows including small-scale structures. Standard interface-resolving multiphase models are commonly used for the simulation of flow regimes containing large-scale structures. The accurate simulation of different regimes has a crucial role to investigate the physics of multiphase flows. To cover the inability of standard models to simulate multiscale multiphase flows, various generalized hybrid models have been developed. The present research aims to present an LES-like approach to identify the large-scale structures by comparing the equivalent diameter of structures and the averaging length scale. The main difference between the presented model and the models available in the literature is the independency of the model to the thresholds of the local volume fraction to recognize the flow regime. The switching criterion is set based on the cell size and the physical phenomena including the break-up and coalescence mechanisms. To assess the capabilities of the presented multiscale model, four different benchmark cases including the bubble column, the impinging jet, the dam break, and the Rayleigh-Taylor instability are investigated. The physical behavior of the flow is considered as a reference and compared with numerical results. It is demonstrated that the present multifluid model is capable to capture the physical characteristics of both dispersed and segregated flow regimes, and it is a forward step to develop a generalized multiscale hybrid multiphase model. |
| first_indexed | 2024-12-11T17:37:07Z |
| format | Article |
| id | doaj.art-e511b93741db47efb66380284754a1bb |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-12-11T17:37:07Z |
| publishDate | 2022-07-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-e511b93741db47efb66380284754a1bb2022-12-22T00:56:39ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452022-07-011541073108510.47176/jafm.15.04.333852050An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence PhenomenaM. M. Noroozi0R. Maddahian1M. H. Ramezani2M. R. Ansari3Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, IranFaculty of Mechanical Engineering, Tarbiat Modares University, Tehran, IranFaculty of Mechanical Engineering, Tarbiat Modares University, Tehran, IranFaculty of Mechanical Engineering, Tarbiat Modares University, Tehran, IranThe multiscale multiphase flow contains both small-scale (dispersed phase) and large-scale (continuous phase) structures. Standard interface-averaging multiphase models are appropriate for the simulation of flows including small-scale structures. Standard interface-resolving multiphase models are commonly used for the simulation of flow regimes containing large-scale structures. The accurate simulation of different regimes has a crucial role to investigate the physics of multiphase flows. To cover the inability of standard models to simulate multiscale multiphase flows, various generalized hybrid models have been developed. The present research aims to present an LES-like approach to identify the large-scale structures by comparing the equivalent diameter of structures and the averaging length scale. The main difference between the presented model and the models available in the literature is the independency of the model to the thresholds of the local volume fraction to recognize the flow regime. The switching criterion is set based on the cell size and the physical phenomena including the break-up and coalescence mechanisms. To assess the capabilities of the presented multiscale model, four different benchmark cases including the bubble column, the impinging jet, the dam break, and the Rayleigh-Taylor instability are investigated. The physical behavior of the flow is considered as a reference and compared with numerical results. It is demonstrated that the present multifluid model is capable to capture the physical characteristics of both dispersed and segregated flow regimes, and it is a forward step to develop a generalized multiscale hybrid multiphase model.https://www.jafmonline.net/article_2050_9c261d181f16d625b9b7d81431786d9c.pdfmultiphase flowcomputational multiphase fluid dynamicstransient flow regimehybrid modelmultiscale model |
| spellingShingle | M. M. Noroozi R. Maddahian M. H. Ramezani M. R. Ansari An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena Journal of Applied Fluid Mechanics multiphase flow computational multiphase fluid dynamics transient flow regime hybrid model multiscale model |
| title | An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena |
| title_full | An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena |
| title_fullStr | An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena |
| title_full_unstemmed | An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena |
| title_short | An LES-Like Multiscale Multiphase Flow Model Based on Break-up and Coalescence Phenomena |
| title_sort | les like multiscale multiphase flow model based on break up and coalescence phenomena |
| topic | multiphase flow computational multiphase fluid dynamics transient flow regime hybrid model multiscale model |
| url | https://www.jafmonline.net/article_2050_9c261d181f16d625b9b7d81431786d9c.pdf |
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