Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology
The present study aims to assess the effects of two different underlying RANS models on overall behavior of the IDDES methodology when applied to different flow configurations ranging from fully attached (plane channel flow) to separated flows (periodic hill flow). This includes investigating predic...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-10-01
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| Series: | Entropy |
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| Online Access: | http://www.mdpi.com/1099-4300/20/10/771 |
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| author | Rohit Saini Nader Karimi Lian Duan Amsini Sadiki Amirfarhang Mehdizadeh |
| author_facet | Rohit Saini Nader Karimi Lian Duan Amsini Sadiki Amirfarhang Mehdizadeh |
| author_sort | Rohit Saini |
| collection | DOAJ |
| description | The present study aims to assess the effects of two different underlying RANS models on overall behavior of the IDDES methodology when applied to different flow configurations ranging from fully attached (plane channel flow) to separated flows (periodic hill flow). This includes investigating prediction accuracy of first and second order statistics, response to grid refinement, grey area dynamics and triggering mechanism. Further, several criteria have been investigated to assess reliability and quality of the methodology when operating in scale resolving mode. It turns out that irrespective of the near wall modeling strategy, the IDDES methodology does not satisfy all criteria required to make this methodology reliable when applied to various flow configurations at different Reynolds numbers with different grid resolutions. Further, it is found that using more advanced underlying RANS model to improve prediction accuracy of the near wall dynamics results in extension of the grey area, which may delay the transition to scale resolving mode. This systematic study for attached and separated flows suggests that the shortcomings of IDDES methodology mostly lie in inaccurate prediction of the dynamics inside the grey area and demands further investigation in this direction to make this methodology capable of dealing with different flow situations reliably. |
| first_indexed | 2024-04-13T06:36:40Z |
| format | Article |
| id | doaj.art-935bdcd01c22485fb5320f6b733749cb |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-13T06:36:40Z |
| publishDate | 2018-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-935bdcd01c22485fb5320f6b733749cb2022-12-22T02:57:54ZengMDPI AGEntropy1099-43002018-10-01201077110.3390/e20100771e20100771Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) MethodologyRohit Saini0Nader Karimi1Lian Duan2Amsini Sadiki3Amirfarhang Mehdizadeh4Civil and Mechanical Engineering Department, School of Computing and Engineering, University of Missouri-Kansas City, Kansas City, MO 64110, USACivil and Mechanical Engineering Department, School of Computing and Engineering, University of Missouri-Kansas City, Kansas City, MO 64110, USADepartment of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USADepartment of Mechanical Engineering, Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64289 Darmstadt, GermanyCivil and Mechanical Engineering Department, School of Computing and Engineering, University of Missouri-Kansas City, Kansas City, MO 64110, USAThe present study aims to assess the effects of two different underlying RANS models on overall behavior of the IDDES methodology when applied to different flow configurations ranging from fully attached (plane channel flow) to separated flows (periodic hill flow). This includes investigating prediction accuracy of first and second order statistics, response to grid refinement, grey area dynamics and triggering mechanism. Further, several criteria have been investigated to assess reliability and quality of the methodology when operating in scale resolving mode. It turns out that irrespective of the near wall modeling strategy, the IDDES methodology does not satisfy all criteria required to make this methodology reliable when applied to various flow configurations at different Reynolds numbers with different grid resolutions. Further, it is found that using more advanced underlying RANS model to improve prediction accuracy of the near wall dynamics results in extension of the grey area, which may delay the transition to scale resolving mode. This systematic study for attached and separated flows suggests that the shortcomings of IDDES methodology mostly lie in inaccurate prediction of the dynamics inside the grey area and demands further investigation in this direction to make this methodology capable of dealing with different flow situations reliably.http://www.mdpi.com/1099-4300/20/10/771hybrid (U)RANS-LESIDDES methodologyattached and separated flows |
| spellingShingle | Rohit Saini Nader Karimi Lian Duan Amsini Sadiki Amirfarhang Mehdizadeh Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology Entropy hybrid (U)RANS-LES IDDES methodology attached and separated flows |
| title | Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology |
| title_full | Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology |
| title_fullStr | Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology |
| title_full_unstemmed | Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology |
| title_short | Effects of Near Wall Modeling in the Improved-Delayed-Detached-Eddy-Simulation (IDDES) Methodology |
| title_sort | effects of near wall modeling in the improved delayed detached eddy simulation iddes methodology |
| topic | hybrid (U)RANS-LES IDDES methodology attached and separated flows |
| url | http://www.mdpi.com/1099-4300/20/10/771 |
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