User-Dependent CFD Predictions of a Backward-Facing Step Flow: Report to participating teams

Lei Peng, Peter Vilhelm Nielsen, Xiaoxue Wang, Yuguo Li

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Abstract

The backward-facing step flow with an expansion ratio of 5 has been modelled by 19 teams without benchmark solution or experimental data. Different CFD codes, turbulence models, boundary conditions, numerical schemes and convergent criteria are adopted based on the participants’ own experience in CFD simulation. The predicted non-dimensional penetration lengths as a function of Reynolds number are diverse among different teams. Even when the same turbulence model or even the laminar model is used, the difference is still notable among the results from different users. We believe that it indicates the combined effects of multiple decisions based on users’ experience may cause significant difference in CFD “experiments”. This calls for a solid approach of CFD validation and uncertainty assessment in CFD “experiments”. A standard or guideline of using CFD and uncertainty assessment is needed to minimize the errors and uncertainties in the future.
Original languageEnglish
Title of host publicationProceedings of the 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE)
Number of pages27
PublisherTianjin University
Publication date2015
Publication statusPublished - 2015
EventThe 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE) - Tianjin University, Tianjin, China
Duration: 12 Jul 201515 Jul 2015
Conference number: 9 - 3

Conference

ConferenceThe 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE)
Number9 - 3
LocationTianjin University
CountryChina
CityTianjin
Period12/07/201515/07/2015

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Computational fluid dynamics
Turbulence models
Reynolds number
Experiments
Boundary conditions
Uncertainty

Cite this

Peng, L., Nielsen, P. V., Wang, X., & Li, Y. (2015). User-Dependent CFD Predictions of a Backward-Facing Step Flow: Report to participating teams. In Proceedings of the 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE) Tianjin University.
Peng, Lei ; Nielsen, Peter Vilhelm ; Wang, Xiaoxue ; Li, Yuguo. / User-Dependent CFD Predictions of a Backward-Facing Step Flow : Report to participating teams. Proceedings of the 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE). Tianjin University, 2015.
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title = "User-Dependent CFD Predictions of a Backward-Facing Step Flow: Report to participating teams",
abstract = "The backward-facing step flow with an expansion ratio of 5 has been modelled by 19 teams without benchmark solution or experimental data. Different CFD codes, turbulence models, boundary conditions, numerical schemes and convergent criteria are adopted based on the participants’ own experience in CFD simulation. The predicted non-dimensional penetration lengths as a function of Reynolds number are diverse among different teams. Even when the same turbulence model or even the laminar model is used, the difference is still notable among the results from different users. We believe that it indicates the combined effects of multiple decisions based on users’ experience may cause significant difference in CFD “experiments”. This calls for a solid approach of CFD validation and uncertainty assessment in CFD “experiments”. A standard or guideline of using CFD and uncertainty assessment is needed to minimize the errors and uncertainties in the future.",
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Peng, L, Nielsen, PV, Wang, X & Li, Y 2015, User-Dependent CFD Predictions of a Backward-Facing Step Flow: Report to participating teams. in Proceedings of the 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE). Tianjin University, The 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE), Tianjin, China, 12/07/2015.

User-Dependent CFD Predictions of a Backward-Facing Step Flow : Report to participating teams. / Peng, Lei; Nielsen, Peter Vilhelm; Wang, Xiaoxue; Li, Yuguo.

Proceedings of the 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE). Tianjin University, 2015.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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Peng L, Nielsen PV, Wang X, Li Y. User-Dependent CFD Predictions of a Backward-Facing Step Flow: Report to participating teams. In Proceedings of the 9th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC) - The 3rd International Conference on Building Energy and Environment (COBEE). Tianjin University. 2015