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Jonsson, Lage Tord Ingemar
Publications (6 of 6) Show all publications
Burman, J., Jonsson, L. T. & Rutgersson, A. (2019). On possibilities to estimate local concentration variations with CFD-LES in real urban environments. Environmental Fluid Mechanics, 19(3), 719-750
Open this publication in new window or tab >>On possibilities to estimate local concentration variations with CFD-LES in real urban environments
2019 (English)In: Environmental Fluid Mechanics, ISSN 1567-7419, E-ISSN 1573-1510, Vol. 19, no 3, p. 719-750Article in journal (Refereed) Published
Abstract [en]

Applied studies with Large Eddy Simulation (LES) of hazardous gas dispersion around buildings in cities have become increasingly feasible due to rapid advancements in computing technology. However, there is little extant literature investigating how each model's results compare with others, as well as their ability to predict near-field dispersion in a real city. In this study, three typical LES sub-grid-scale models are used to simulate gas dispersion, utilizing alternatively constant values and synthetic turbulence at inflow boundaries. The results are compared with data from the Joint Urban 2003 Atmospheric Dispersion Study in Oklahoma City. Flow and turbulence statistics of the simulation is presented at two probe locations, one inside the city-core and one outside. In addition, comparisons with the measured mean concentration and maximum concentration values are conducted. It was found that in the core of the city, simulated turbulence is mainly determined by buildings and their configurations, and is only weakly affected by model type and assumed turbulence at the inflow boundaries. On the other hand, outside and upwind the city center the turbulence set at the inflow boundaries is very important if realistic turbulence statistics is to be achieved. Downstream of the source, all tested models produce similar predictions of maximum concentration values, which in turn are similar to the experimental data. Thus, the results indicate that it could be better to use the LES calculated maximum-concentration instead of the calculated mean-concentration when developing methods for hazard area estimation.

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Gas dispersion, Urban area, LES, SIGMA, CFD, Synthetic boundary condition, Turbulencestatistics, Contaminant statistics, JU2003
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-254007 (URN)10.1007/s10652-018-9650-4 (DOI)000469019500007 ()2-s2.0-85057506496 (Scopus ID)
Note

QC 20190814

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved
Ni, P., Ersson, M., Jonsson, L. T. & Jönsson, P. (2018). A study on the nonmetallic inclusion motions in a swirling flow submerged entry nozzle in a new cylindrical tundish design. Metallurgical and materials transactions. B, process metallurgy and materials processing science, 49(2), 723-736
Open this publication in new window or tab >>A study on the nonmetallic inclusion motions in a swirling flow submerged entry nozzle in a new cylindrical tundish design
2018 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 49, no 2, p. 723-736Article in journal (Refereed) Published
Abstract [en]

Different sizes and shapes of nonmetallic inclusions in a swirling flow submerged entry nozzle (SEN) placed in a new tundish design were investigated by using a Lagrangian particle tracking scheme. The results show that inclusions in the current cylindrical tundish have difficulties remaining in the top tundish region, since a strong rotational steel flow exists in this region. This high rotational flow of 0.7 m/s provides the required momentum for the formation of a strong swirling flow inside the SEN. The results show that inclusions larger than 40 µm were found to deposit to a smaller extent on the SEN wall compared to smaller inclusions. The reason is that these large inclusions have Separation number values larger than 1. Thus, the swirling flow causes these large size inclusions to move toward the SEN center. For the nonspherical inclusions, large size inclusions were found to be deposited on the SEN wall to a larger extent, compared to spherical inclusions. More specifically, the difference of the deposited inclusion number is around 27 pct. Overall, it was found that the swirling flow contains three regions, namely, the isotropic core region, the anisotropic turbulence region and the near-wall region. Therefore, anisotropic turbulent fluctuations should be taken into account when the inclusion motion was tracked in this complex flow. In addition, many inclusions were found to deposit at the SEN inlet region. The plotted velocity distribution shows that the inlet flow is very chaotic. A high turbulent kinetic energy value of around 0.08 m2/s2 exists in this region, and a recirculating flow was also found here. These flow characteristics are harmful since they increase the inclusion transport toward the wall. Therefore, a new design of the SEN inlet should be developed in the future, with the aim to modify the inlet flow so that the inclusion deposition is reduced.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-238356 (URN)10.1007/s11663-017-1162-y (DOI)000426808500024 ()2-s2.0-85047456102 (Scopus ID)
Note

QC 20181113

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-12Bibliographically approved
Ni, P., Ersson, M., Jonsson, L. T., Zhang, T.-A. -. & Jönsson, P. (2018). Effect of immersion depth of a swirling flow tundish SEN on multiphase flow and heat transfer in Mold. Metals, 8(11), Article ID 910.
Open this publication in new window or tab >>Effect of immersion depth of a swirling flow tundish SEN on multiphase flow and heat transfer in Mold
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 11, article id 910Article in journal (Refereed) Published
Abstract [en]

The effect of the immersion depth of a new swirling flow tundish SEN (Submerged Entry Nozzle) on the multiphase flow and heat transfer in a mold was studied using numerical simulation. The RSM (Reynolds Stress Model) and the VOF (Volume of Fluid) model were used to solve the steel and slag flow phenomena. The results show that the SEN immersion depth can significantly influence the steel flow near the meniscus. Specifically, an increase of the SEN immersion depth decreases the interfacial velocity, and this reduces the risk for the slag entrainment. The calculated Weber Number decreases from 0.8 to 0.2 when the SEN immersion depth increases from 15 cm to 25 cm. With a large SEN immersion depth, the steel flow velocity near the solidification front, which is below the mold level of SEN outlet, was increased. The temperature distribution has a similar distribution characteristic for different SEN immersion depths. The high temperature region is located near the solidification front. Temperature near the meniscus was slightly decreased when the SEN immersion depth was increased, due to an increased steel moving distance from the SEN outlet to the meniscus.

Place, publisher, year, edition, pages
MDPI AG, 2018
Keywords
Continuous casting mold, Heat transfer, Multiphase flow, SEN immersion depth, Swirling flow tundish
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-247071 (URN)10.3390/met8110910 (DOI)000451735100049 ()2-s2.0-85056317151 (Scopus ID)
Note

QC 20190625

Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-10-28Bibliographically approved
Ni, P., Ersson, M., Jonsson, L. T., Zhang, T.-A. -. & Jönsson, P. (2018). Numerical study on the influence of a swirling flow tundish on multiphase flow and heat transfer in mold. Metals, 8(5), Article ID 368.
Open this publication in new window or tab >>Numerical study on the influence of a swirling flow tundish on multiphase flow and heat transfer in mold
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 5, article id 368Article in journal (Refereed) Published
Abstract [en]

The effect of a new cylindrical swirling flow tundish design on the multiphase flow and heat transfer in a mold was studied. The RSM (Reynolds stress model) and the VOF (volume of fluid) model were used to solve the steel and slag flow phenomena. The effect of the swirling flow tundish design on the temperature distribution and inclusion motion was also studied. The results show that the new tundish design significantly changed the flow behavior in the mold, compared to a conventional tundish casting. Specifically, the deep impingement jet from the SEN (Submerged Entry Nozzle) outlet disappeared in the mold, and steel with a high temperature moved towards the solidified shell due to the swirling flow effect. Steel flow velocity in the top of the mold was increased. A large velocity in the vicinity of the solidified shell was obtained. Furthermore, the risk of the slag entrainment in the mold was also estimated. With the swirling flow tundish casting, the temperature distribution became more uniform, and the dissipation of the steel superheat was accelerated. In addition, inclusion trajectories in the mold also changed, which tend to stay at the top of the mold for a time. A future study is still required to further optimize the steel flow in mold.

Place, publisher, year, edition, pages
MDPI AG, 2018
Keywords
Continuous casting, Heat transfer, Mold, Multiphase flow, Swirling flow tundish
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-238229 (URN)10.3390/met8050368 (DOI)000435109300078 ()2-s2.0-85047458135 (Scopus ID)
Note

QC 20181114

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2018-11-14Bibliographically approved
Burman, J. & Jonsson, L. T. (2017). Synthetic boundary conditions using les for urban dispersion modelling. In: HARMO 2017 - 18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings: . Paper presented at 18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2017, CNR Research Area, Bologna, Italy, 9 October 2017 through 12 October 2017 (pp. 788-792). Hungarian Meteorological Service
Open this publication in new window or tab >>Synthetic boundary conditions using les for urban dispersion modelling
2017 (English)In: HARMO 2017 - 18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings, Hungarian Meteorological Service , 2017, p. 788-792Conference paper, Published paper (Refereed)
Abstract [en]

Large Eddy Simulation with two sub-grid-scale models are used to simulate gas dispersion, utilizing alternatively constant values and synthetic turbulence at inflow boundaries. The results are compared with data from the JU2003 Atmospheric Dispersion Study in Oklahoma City. Turbulence statistics of the simulation is presented at two probe locations, one inside the city-core and one outside. In addition, comparisons with the measured concentration-data and maximum-values are conducted. It was found that in the core of the city, modeled turbulence is mainly determined by buildings and their configurations, and is only weakly affected by model type and assumed turbulence at inflow boundaries. Within the predicted flow-path, the tested models produce similar predictions of maximum concentration values, which in turn are similar to the experimental data. The results indicate that synthetic turbulence at the inflow boundary is less important when building generated turbulence dominate but it is important if not a local boundary layer is developed.

Place, publisher, year, edition, pages
Hungarian Meteorological Service, 2017
Keywords
CFD, Contaminant statistics, Flow statistics, Gas dispersion, JU2003, LES, Urban area
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-228680 (URN)2-s2.0-85047218210 (Scopus ID)
Conference
18th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2017, CNR Research Area, Bologna, Italy, 9 October 2017 through 12 October 2017
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Ni, P., Jonsson, L. T., Ersson, M. & Jönsson, P. (2017). Transport and Deposition of Non-Metallic Inclusions in Steel Flows- A Comparison of Different Model Predictions to Pilot Plant Experiment Data. Steel Research International, 88(12), Article ID UNSP 1700155.
Open this publication in new window or tab >>Transport and Deposition of Non-Metallic Inclusions in Steel Flows- A Comparison of Different Model Predictions to Pilot Plant Experiment Data
2017 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 88, no 12, article id UNSP 1700155Article in journal (Refereed) Published
Abstract [en]

Inclusion behavior during a ladle teeming process is investigated. A Lagrangian method is used to track different-size inclusions and to compare their behaviors in steel flows, solved by the realizable k-epsilon model with SWF (Standard Wall Function), realizable k-epsilon model with EWT (Enhanced Wall Treatment), and RSM (Reynolds Stress Model). The results show that inclusion tracking based on the realizable k-epsilon model with SWF to predict the steel flow does not agree with the data fromplant experiments. The predicted number of inclusions touching the wall shows almost no dependence on inclusion size. This is due to that the boundary layer is not resolved. The inclusion deposition predicted using the realizable k-epsilon model with EWT and the RSM model to predict the steel flow generally agrees with the experimental observations. However, the large size inclusion deposition is over-predicted when using the realizable k-epsilon model with EWT. More specifically, the prediction for 20 mu m inclusions is three times larger than that with the RSM. This is due to that this model cannot calculate the anisotropic turbulence fluctuations. In summary, the turbulence properties in the near-wall boundary layer are found to be very important for a good prediction on inclusion deposition.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-220620 (URN)10.1002/srin.201700155 (DOI)000417137300008 ()2-s2.0-85026291363 (Scopus ID)
Note

QC 20180112

Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-12Bibliographically approved
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