Change search
Link to record
Permanent link

Direct link
Andersson, Anders G.ORCID iD iconorcid.org/0000-0001-9789-6293
Alternative names
Publications (10 of 45) Show all publications
Sjöstedt, L. M., Hellström, J. G. & Andersson, A. G. (2023). CFD Modelling as a Tool to Better Understand Fish Behavior. In: Helmut Habersack; Michael Tritthart; Lisa Waldenberger (Ed.), Proceedings of the 40th IAHR World Congress - 2023: Rivers - Connecting Mountains and Coasts. Paper presented at 40th IAHR World Congress, Vienna , Austria, August 21-25, 2023 (pp. 2665-2672). International Association for Hydro-Environment Engineering and Research (IAHR)
Open this publication in new window or tab >>CFD Modelling as a Tool to Better Understand Fish Behavior
2023 (English)In: Proceedings of the 40th IAHR World Congress - 2023: Rivers - Connecting Mountains and Coasts / [ed] Helmut Habersack; Michael Tritthart; Lisa Waldenberger, International Association for Hydro-Environment Engineering and Research (IAHR) , 2023, p. 2665-2672Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
International Association for Hydro-Environment Engineering and Research (IAHR), 2023
National Category
Fluid Mechanics and Acoustics Ecology
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-103389 (URN)10.3850/978-90-833476-1-5_iahr40wc-p0582-cd (DOI)
Conference
40th IAHR World Congress, Vienna , Austria, August 21-25, 2023
Projects
Sustainable Hydropower
Funder
Swedish Energy Agency
Note

ISBN for host publication: 978-90-833476-1-5

Available from: 2023-12-21 Created: 2023-12-21 Last updated: 2023-12-21Bibliographically approved
Burman, A. J., Andersson, A. G. & Hellström, J. G. (2023). Hydraulic classification of hydropeaking stages in a river reach. Rivers Research and Applications: an international journal devoted to river research and management, 39(4), 692-702
Open this publication in new window or tab >>Hydraulic classification of hydropeaking stages in a river reach
2023 (English)In: Rivers Research and Applications: an international journal devoted to river research and management, ISSN 1535-1459, E-ISSN 1535-1467, Vol. 39, no 4, p. 692-702Article in journal (Refereed) Published
Abstract [en]

Hydropower is an important tool in the struggle for low-emission power production. In the Nordic countries, hydropower operating conditions are expected to change and work more in conjunction with intermittent power production. This in turn might increase the amount of hydropeaking events in the reaches downstream of hydropower plants. The current work investigates the influence of highly flexible, high-frequency hydropeaking on the hydrodynamics in the downstream reach. By quantifying four different dynamic stages in the study reach, the influence of the hydropeaking frequencies was investigated in the bypass reach of the Stornorrfors hydropower plant in the river Umeälven in northern Sweden. The hydrodynamics in the study reach were numerically modelled using the open source solver Delft3D. Eight different highly flexible future hydropeaking scenarios, varying from 12 to 60 flow changes per day, were considered. A method for identifying four hydropeaking stages—dewatering, dynamic, alternating and uniform —was introduced. The hydropeaking frequency directly decided the stage in most of the study reach. Furthermore, a Fourier analysis showed a significant difference between the stages and their corresponding power spectra. The classification of stages put forward in this work provides a novel, simple method to investigate the hydrodynamics due to hydropeaking in a river reach.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
delft3d, Fourier analysis, hydraulic stage, hydropeaking, hydropeaking frequency
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-94340 (URN)10.1002/rra.4098 (DOI)000907519300001 ()2-s2.0-85145677139 (Scopus ID)
Funder
EU, Horizon 2020, 764011
Note

Validerad;2023;Nivå 2;2023-07-21 (sofila);

This article has previously appeared as a manuscript in a thesis.

Available from: 2022-11-29 Created: 2022-11-29 Last updated: 2023-07-21Bibliographically approved
Höller, J. B., Andersson, A. G. & Hellström, J. G. (2023). Integrating Downstream Ecological, Social and Economic Effects of Hydropower to Hydraulic Modeling: A Review. World Journal of Mechanics, 13(8), 149-172
Open this publication in new window or tab >>Integrating Downstream Ecological, Social and Economic Effects of Hydropower to Hydraulic Modeling: A Review
2023 (English)In: World Journal of Mechanics, ISSN 2160-049X, E-ISSN 2160-0503, Vol. 13, no 8, p. 149-172Article, review/survey (Refereed) Published
Abstract [en]

Hydropower gains increasing importance as a steerable and controllable power source in a renewable energy mix and deregulated markets. Although hydropower produces fossil-free energy, it has a significant impact on the local environment. This review investigates the effects of flow alterations by hydropower on the downstream river system and the possibilities to integrate these effects into hydraulic modeling. The results show that various effects of flow regulation on the ecosystem, but also social and economic effects on related communities were observed in the last decades. The application of hydraulic models for investigations of ecological effects is common. Especially hydraulic effects and effects on fish were extensively modeled with the help of hydraulic 1D- and 2D-simulations. Current applications to investigate social and economic effects integrated into hydraulic modeling are meanwhile limited. Approaches to realizing this integration are presented. Further research on the economic valuation of ecosystems and integration of social and economic effects to hydraulic models is necessary to develop holistic tools to support decision-making on sustainable hydropower.

Keywords
Sustainable Hydropower, Hydraulic Simulation, River Regulation, Down-stream Effects, Integrated Modeling
National Category
Economics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-103481 (URN)10.4236/wjm.2023.138009 (DOI)
Note

Godkänd;2024;Nivå 0;2024-01-05 (hanlid);

Full text license: CC BY

Available from: 2024-01-05 Created: 2024-01-05 Last updated: 2024-01-05Bibliographically approved
Burman, A., Andersson, A. G., Hellström, J. G. & Xie, Q. (2022). Ecohydraulical Applications and Limitations of Calibrated Numerical 2D Models. In: Miguel Ortega-Sánchez (Ed.), Proceedings of the 39th IAHR World Congress: From Snow To Sea: . Paper presented at 39th IAHR World Congress, Granada, Spain, June 19-24, 2022 (pp. 1557-1564). International Association for Hydro-Environment Engineering and Research (IAHR)
Open this publication in new window or tab >>Ecohydraulical Applications and Limitations of Calibrated Numerical 2D Models
2022 (English)In: Proceedings of the 39th IAHR World Congress: From Snow To Sea / [ed] Miguel Ortega-Sánchez, International Association for Hydro-Environment Engineering and Research (IAHR) , 2022, p. 1557-1564Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
International Association for Hydro-Environment Engineering and Research (IAHR), 2022
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-94339 (URN)10.3850/IAHR-39WC2521711920221796 (DOI)2-s2.0-85176466987 (Scopus ID)
Conference
39th IAHR World Congress, Granada, Spain, June 19-24, 2022
Funder
EU, Horizon 2020, 764011
Note

ISBN for host publication: 978-90-832612-1-8

Available from: 2022-11-29 Created: 2022-11-29 Last updated: 2023-12-20Bibliographically approved
Andersson, A. G. & Lycksam, H. (2022). Hydraulic Modelling of a Regulated River Reach on Different Scales to Evaluate its Inherent Environmental Conditions. In: Miguel Ortega-Sánchez (Ed.), Proceedings of the 39th IAHR World Congress: From Snow To Sea. Paper presented at 39th IAHR World Congress, Granada, Spain, June 19-24, 2022 (pp. 4189-4195). International Association for Hydro-Environment Engineering and Research (IAHR)
Open this publication in new window or tab >>Hydraulic Modelling of a Regulated River Reach on Different Scales to Evaluate its Inherent Environmental Conditions
2022 (English)In: Proceedings of the 39th IAHR World Congress: From Snow To Sea / [ed] Miguel Ortega-Sánchez, International Association for Hydro-Environment Engineering and Research (IAHR) , 2022, p. 4189-4195Conference paper, Published paper (Refereed)
Abstract [en]

Hydraulic modelling can be an important tool to assess ecological status of rivers and to evaluate where and how measures should be implemented to maximize their impact. This is becoming increasingly important in regulated rivers since hydropower’s ability to balance intermittent electricity sources such as wind- and solar power is resulting in more frequent starts and stops of the power plants, which in turn is affecting the local environmental conditions. The resulting flow fields from the modelling can, for instance, be used to classify biologically important areas in rivers. Several relevant flow parameters can be predicted and applied, e.g., depth and water velocities can be used to estimate habitat for specific fish species or the variation in water levels can be used to evaluate the risk of stranding for fish in different life stages. This work specifically involves numerical modelling of a heavily regulated reach in the Lule River in northern Sweden. Models are created in 1D, 2D and 3D to show strengths and weaknesses in the different modelling techniques. To ensure that the models capture reality, measurements of water levels and temperatures in the reach are performed using pressure/temperature loggers for validation purposes. River velocities are also measured with an Acoustic Doppler Current Profiler which are mainly used to validate the 3D model. The results derived using the different modelling methods are all shown to be useful depending on relevant application.

Place, publisher, year, edition, pages
International Association for Hydro-Environment Engineering and Research (IAHR), 2022
Series
Proceedings of the IAHR World Congress, ISSN 2521-7119, E-ISSN 2521-716X
Keywords
Ecohydraulics, Numerical Modelling, Field Measurements, River Hydraulics
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-92466 (URN)10.3850/IAHR-39WC2521711920221807 (DOI)2-s2.0-85177183035 (Scopus ID)
Conference
39th IAHR World Congress, Granada, Spain, June 19-24, 2022
Funder
Swedish Energy Agency
Available from: 2022-08-15 Created: 2022-08-15 Last updated: 2024-01-25Bibliographically approved
Höller, B. & Andersson, A. G. (2022). Integrating Ecological and Economic Impacts of Hydropower to Digital Twins of River Reaches. In: Pär Jonsén; Lars-Göran Westerberg; Simon Larsson; Erik Olsson (Ed.), Svenska Mekanikdagar 2022: . Paper presented at Svenska Mekanikdagarna 2022, Luleå, Sweden, June 15-16, 2022. Luleå tekniska universitet
Open this publication in new window or tab >>Integrating Ecological and Economic Impacts of Hydropower to Digital Twins of River Reaches
2022 (English)In: Svenska Mekanikdagar 2022 / [ed] Pär Jonsén; Lars-Göran Westerberg; Simon Larsson; Erik Olsson, Luleå tekniska universitet, 2022Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Luleå tekniska universitet, 2022
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-95085 (URN)
Conference
Svenska Mekanikdagarna 2022, Luleå, Sweden, June 15-16, 2022
Available from: 2022-12-30 Created: 2022-12-30 Last updated: 2023-01-09Bibliographically approved
Knoepp, F., Wahl, J., Andersson, A., Kraut, S., Sommer, N., Weissmann, N. & Ramser, K. (2021). A Microfluidic System for Simultaneous Raman Spectroscopy, Patch-Clamp Electrophysiology, and Live-Cell Imaging to Study Key Cellular Events of Single Living Cells in Response to Acute Hypoxia. Small Methods, 5(10), Article ID 2100470.
Open this publication in new window or tab >>A Microfluidic System for Simultaneous Raman Spectroscopy, Patch-Clamp Electrophysiology, and Live-Cell Imaging to Study Key Cellular Events of Single Living Cells in Response to Acute Hypoxia
Show others...
2021 (English)In: Small Methods, E-ISSN 2366-9608, Vol. 5, no 10, article id 2100470Article in journal (Refereed) Published
Abstract [en]

The ability to sense changes in oxygen availability is fundamentally important for the survival of all aerobic organisms. However, cellular oxygen sensing mechanisms and pathologies remain incompletely understood and studies of acute oxygen sensing, in particular, have produced inconsistent results. Current methods cannot simultaneously measure the key cellular events in acute hypoxia (i.e., changes in redox state, electrophysiological properties, and mechanical responses) at controlled partial pressures of oxygen (pO2). The lack of such a comprehensive method essentially contributes to the discrepancies in the field. A sealed microfluidic system that combines i) Raman spectroscopy, ii) patch-clamp electrophysiology, and iii) live-cell imaging under precisely controlled pO2 have therefore been developed. Merging these modalities allows label-free and simultaneous observation of oxygen-dependent alterations in multiple cellular redox couples, membrane potential, and cellular contraction. This technique is adaptable to any cell type and allows in-depth insight into acute oxygen sensing processes underlying various physiologic and pathologic conditions. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2021
National Category
Other Medical Engineering
Research subject
Experimental Mechanics; Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-86830 (URN)10.1002/smtd.202100470 (DOI)000689682700001 ()34927935 (PubMedID)2-s2.0-85113152558 (Scopus ID)
Funder
Swedish Research Council, 2016–04220
Note

Validerad;2021;Nivå 2;2021-11-03 (beamah);

Forskningsfinansiär: Deutsche Forschungsgemeinschaft (452531259, 268555672); CRC 1213 (A06)

Available from: 2021-08-26 Created: 2021-08-26 Last updated: 2023-09-05Bibliographically approved
Burman, A. J., Hedger, R. D., Hellström, J. G., Andersson, A. G. & Sundt-Hansen, L. E. (2021). Modelling the downstream longitudinal effects of frequent hydropeaking on the spawning potential and stranding susceptibility of salmonids. Science of the Total Environment, 796, Article ID 148999.
Open this publication in new window or tab >>Modelling the downstream longitudinal effects of frequent hydropeaking on the spawning potential and stranding susceptibility of salmonids
Show others...
2021 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 796, article id 148999Article in journal (Refereed) Published
Abstract [en]

Hydropower plant operating conditions are expected to change to be more in tandem with intermittent power production so as to meet the requirements of the Paris Agreement, which in turn may negatively impact ecological conditions downstream of the hydropower plants. The current study investigates how highly flexible hydropower operating conditions may impact several salmonid species (European grayling, Atlantic salmon and brown trout) in the River Umeälven, a major river in northern Sweden; specifically, how changes in hydropeaking frequency may affect the area of the downstream watercourse that is hydraulically suitable for spawning (potential spawning area) and how changes in spill gate closing time may affect the propensity to stranding. River hydrodynamics were modeled using the open-source solver Delft3D, with a range of hydropeaking frequencies (from 10 to 60 starts and stops per day) and a range of spill gate closing times from (1–30 min). Increasing the hydropeaking frequency caused a reduction in potential spawning area, but also a reduction in dewatering of potential spawning area at low flows. Increasing spill gate closing time caused a decrease in propensity to stranding. Effects were dependent on both species and life-stage, and declined longitudinally with distance downstream from the spillway outlet. The modelling approach used here provides an effective method for predicting likely outcomes of flexible hydropower operating conditions, taking into account fish species and life-stages present and watercourse characteristics.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
Hydropeaking, Spawning habitat, Salmonids, Modelling, Dewatering
National Category
Fluid Mechanics and Acoustics Ecology
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-86377 (URN)10.1016/j.scitotenv.2021.148999 (DOI)000697347800016 ()34280623 (PubMedID)2-s2.0-85110532565 (Scopus ID)
Funder
EU, Horizon 2020, 764011
Note

Validerad;2021;Nivå 2;2021-07-26 (beamah)

Available from: 2021-07-15 Created: 2021-07-15 Last updated: 2022-11-29Bibliographically approved
Burman, A. J., Andersson, A. G., Hellström, J. G. & Angele, K. (2020). Case Study of Transient Dynamics in a Bypass Reach. Water, 12(6), Article ID 1585.
Open this publication in new window or tab >>Case Study of Transient Dynamics in a Bypass Reach
2020 (English)In: Water, E-ISSN 2073-4441, Vol. 12, no 6, article id 1585Article in journal (Refereed) Published
Abstract [en]

The operating conditions of Nordic hydropower plants are expected to change in the coming years to work more in conjunction with intermittent power production, causing more frequent hydropeaking events. Hydropeaking has been shown to be detrimental to wildlife in the river reaches downstream of hydropower plants. In this work, we investigate how different possible future hydropeaking scenarios affect the water surface elevation dynamics in a bypass reach in the Ume River in northern Sweden. The river dynamics has been modeled using the open-source solver Delft3D. The numerical model was validated and calibrated with water-surface-elevation measurements. A hysteresis effect on the water surface elevation, varying with the downstream distance from the spillways, was seen in both the simulated and the measured data. Increasing the hydropeaking rate is shown to dampen the variation in water surface elevation and wetted area in the most downstream parts of the reach, which could have positive effects on habitat and bed stability compared to slower rates in that region.

Place, publisher, year, edition, pages
MDPI, 2020
Keywords
inherent damping, hydropeaking, river dynamics, hydraulic modeling, delft3d
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-79175 (URN)10.3390/w12061585 (DOI)000550865600001 ()2-s2.0-85087451637 (Scopus ID)
Projects
HydroFlex
Note

Validerad;2020;Nivå 2;2020-07-15 (alebob)

Available from: 2020-06-04 Created: 2020-06-04 Last updated: 2023-08-28Bibliographically approved
Misiulia, D., Antonyuk, S., Andersson, A. G. & Lundström, T. S. (2020). High-efficiency industrial cyclone separator: A CFD study. Powder Technology, 364, 943-953
Open this publication in new window or tab >>High-efficiency industrial cyclone separator: A CFD study
2020 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 364, p. 943-953Article in journal (Refereed) Published
Abstract [en]

The flow within an industrial scroll-inlet high-efficiency cyclone separator has been studied using RSM and LES simulations. Of particular interest is the effect of the gas outlet configuration, i.e. outlet scroll and radial bend, on the flow pattern, pressure drop and cyclone efficiency. A surprising phenomenon is that the inner vortex splits into two vortices for the cyclone with a conventional outlet pipe while if the cyclone is equipped with an outlet scroll or radial bend there is no split. The outlet scroll and radial bend increase the pressure losses by 5.1% and 6.4%, respectively. These installations, moreover, significantly destabilize the pressure losses and the amplitude of instantaneous pressure drop oscillations increases from 0.65% to 16.2% and 33.96%, respectively. The investigated outlet scroll and radial bend have practically no effects on the cyclone efficiency since the flow in the main separation zone is not affected by the gas outlet configuration.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Cyclone separator, Computational fluid dynamics, Vortex breakdown, Pressure drop, Collection efficiency
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-76944 (URN)10.1016/j.powtec.2019.10.064 (DOI)000528218100083 ()2-s2.0-85075881002 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-04-09 (alebob)

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2020-05-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9789-6293

Search in DiVA

Show all publications