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Jonsson, Patrick
Publications (7 of 7) Show all publications
Jonsson, P., Andreasson, P., Hellström, G., Jonsén, P. & Lundström, S. (2016). Smoothed Particle Hydrodynamic Simulation of Hydraulic Jump using Periodic Open Boundaries (ed.). Applied Mathematical Modelling, 40(19-20), 8391-8405
Open this publication in new window or tab >>Smoothed Particle Hydrodynamic Simulation of Hydraulic Jump using Periodic Open Boundaries
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2016 (English)In: Applied Mathematical Modelling, ISSN 0307-904X, E-ISSN 1872-8480, Vol. 40, no 19-20, p. 8391-8405Article in journal (Refereed) Published
Abstract [en]

The natural phenomena hydraulic jump that is commonly used in spillways as an energy dissipater coupled to hydropower applications has been investigated with Smoothed Particle Hydrodynamics. A new approach was applied based on a periodic open boundary condition. The model consisted of a tank, a gate, a stilling basin and periodic open boundaries at each end of the computational domain. The tank provided a hydraulic head and in turn a specific flow through the gate, and a downstream condition in terms of a depth for the jump. The gate elevation had a major impact and was calibrated to ensure a correct and stable flow rate, when compared to experiments. With the proper flow rate, the position of the jump toe was significantly improved. The jump toe oscillated with a frequency in good agreement with experimental findings found in the literature and the oscillation amplitude increased with Froude number. However, for high Froude number cases the position was still too close to the gate but could be improved by including a correction based on the length of the jump. The depths in both the super- and subcritical zones was in good agreement with experiments and previous numerical studies. Furthermore, the Froude number was in-line with the definition of super- and subcritical flows.

National Category
Fluid Mechanics and Acoustics Applied Mechanics
Research subject
Fluid Mechanics; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-6399 (URN)10.1016/j.apm.2016.04.028 (DOI)000383309700017 ()2-s2.0-84969548789 (Scopus ID)4a090de8-59cc-42e0-9d45-ab12699f7a57 (Local ID)4a090de8-59cc-42e0-9d45-ab12699f7a57 (Archive number)4a090de8-59cc-42e0-9d45-ab12699f7a57 (OAI)
Note

Validerad; 2016; Nivå 2; 2016-11-21(andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Jonsson, P., Jonsén, P., Andreasson, P., Lundström, S. & Hellström, G. (2015). Modelling Dam Break Evolution over a Wet Bed with Smoothed Particle Hydrodynamics: A Parameter Study (ed.). Engineering, 7(5), 248-260
Open this publication in new window or tab >>Modelling Dam Break Evolution over a Wet Bed with Smoothed Particle Hydrodynamics: A Parameter Study
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2015 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 7, no 5, p. 248-260Article in journal (Refereed) Published
National Category
Fluid Mechanics and Acoustics Applied Mechanics
Research subject
Fluid Mechanics; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-5032 (URN)10.4236/eng.2015.75022 (DOI)30d2b155-537b-4413-a041-bb19c11171e8 (Local ID)30d2b155-537b-4413-a041-bb19c11171e8 (Archive number)30d2b155-537b-4413-a041-bb19c11171e8 (OAI)
Note

Validerad; 2015; Nivå 1; 20150522 (stlu)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jonsson, P. (2015). Smoothed Particle Hydrodynamic of Hydraulic Jumps in Spillways (ed.). (Doctoral dissertation). Paper presented at . : Luleå tekniska universitet
Open this publication in new window or tab >>Smoothed Particle Hydrodynamic of Hydraulic Jumps in Spillways
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focus on the complex natural phenomena of hydraulic jumps using the numerical method Smoothed Particle Hydrodynamics (SPH). A hydraulic jump is highly turbulent and associated with turbulent energy dissipation, air entrainment, surface waves and spray and strong dissipative processes. It can be found not only in natural streams and in engineered open channels, but also in your kitchen sink at home. The dissipative features are utilized in hydropower spillways and stilling basins to reduce high velocity flows. Potentially, such flow can cause erosion and reduce the lifetime and increase maintenance costs of spillways and related structures which must be avoided. Usually, spillways are engaged to safely pass extreme flooding events and redirect the flow during maintenance shutdown of the production units, i.e. turbines and generators. It is hence vital to understand and be able to predict the involved processes in a hydraulic jump. The Lagrangian, meshless particle based numerical method SPH has been considered as the main computational method throughout this thesis. The ability of the SPH method to capture complex free-surfaces with large deformation and fragmentation, found in hydraulic jumps, makes it a strong modelling tool. However, the SPH method is less developed compared to the established Finite Volume- (FVM) and Finite Element (FEM) methods. Initially, focus was on reproducing the results of previous studies where the geometrical aspect of hydraulic jumps was the main consideration (Paper A). Several modelling parameters were re-evaluated using a dam-break test case in Paper B and later applied in Paper C. Paper C, focused not only on the geometrical aspect of the hydraulic jump but also on the internal flow field and its relation to the free-surface. Later in Paper D, a new strategy on how to perform SPH hydraulic jump simulations based on periodic open boundaries was developed. Finally, the method developed was applied in two separate studies. In Paper E, the SPH method was compared with experiments performed at Vattenfall Research & Development in ¨Alvkarleby, Sweden. The SPH model, comprised of a channel and a scaled spillway outlet chute, not only captured the jump position but also large scale flow features. The final Paper F, was a continuation of Paper C where the internal flow field and its dynamical relationship with the free surface was reinvestigated using the more sophisticated SPH model.

Place, publisher, year, edition, pages
Luleå tekniska universitet, 2015
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-18570 (URN)938d7ffa-57c7-40da-b85b-8ef6a30ded3e (Local ID)978-91-7583-483-2 (ISBN)978-91-7583-484-9 (ISBN)938d7ffa-57c7-40da-b85b-8ef6a30ded3e (Archive number)938d7ffa-57c7-40da-b85b-8ef6a30ded3e (OAI)
Note
Godkänd; 2015; 20151019 (patjon); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Patrick Jonsson Ämne: Strömningslära/Fluid Mechanics Avhandling: Smoothed Particle Hydrodynamic of Hydraulic Jumps in Spillways Opponent: Professor Peter Stansby, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, England Ordförande: Professor Staffan Lundström, Avd för strömningslära och experimentell mekanik, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet, Luleå Tid: Torsdag 17 december, 2015 kl 09.00 Plats: E231, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jonsson, P. (2013). Smoothed particle hydrodynamics in hydropower applications: modeling of hydraulic jumps (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Smoothed particle hydrodynamics in hydropower applications: modeling of hydraulic jumps
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In present thesis, the Lagrangian particle based method Smoothed ParticleHydrodynamics (SPH) is used to model two-dimensional problems associated with hydropower applications such as dam break evolution and hydraulic jumps. In the SPHmethod, the fluid domain is represented by a set of non-connected particles which possess individual material properties such as mass, density, velocity, position and pressure. Besides representing the problem domain and acting as information carriers the particles also act as the computational frame for the field function approximations. As the particles move with the fluid the material properties changes over time due to interaction with neighbouring particles. The adaptive nature of the SPH-method together with the nonconnectivity between the particles results in a method that is able to handle very large deformations as is the case for highly disordered free-surface flows such as hydraulic jumps.The dam break case was used as a model validation test case where the response of different parameter settings was explored. The SPH spatial resolution and the choice of artificial viscosity (a term in the momentum equation) constants had a major impact on the results. Increasing the spatial resolution increased the number of flow features resolved and setting the constants equal to unity resulted in a highly viscous and unphysical solution.Following the parameter study, the work focused on SPH simulations of hydraulic jumps. A hydraulic jump is a rapid transition from supercritical flow to subcritical flow characterized by the development of large scale turbulence, surface waves, spray, energy dissipation and considerable air entrainment. Several features of the jump were explored using the SPH method and good agreement with theory and experiments was obtained for e.g. the conjugate depth and the mean free surface elevation in the roller section. However, the free surface fluctuation frequencies were over predicted and the model could not capture the decay of fluctuations in the horizontal direction.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2013
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-16867 (URN)0593fed4-aa26-40e9-a56b-b097c03c29f2 (Local ID)978-91-7439-678-2 (ISBN)978-91-7439-679-9 (ISBN)0593fed4-aa26-40e9-a56b-b097c03c29f2 (Archive number)0593fed4-aa26-40e9-a56b-b097c03c29f2 (OAI)
Note
Godkänd; 2013; 20130425 (patjon); Tillkännagivande licentiatseminarium 2013-05-29 Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Patrick Jonsson Ämne: Strömningslära/Fluid Mechanics Uppsats: Smoothed Particle Hydrodynamics in Hydropower Applications Modelling of Hydraulic Jumps Examinator: Professor Staffan Lundström, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Diskutant: Doktor, forskare Gustaf Gustafsson, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Tid: Torsdag den 20 juni 2013 kl 09.00 Plats: E231, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Jonsson, P., Jonsén, P., Andreasson, P., Lundström, T. S. & Hellström, J. G. (2012). Smoothed Particle Hydrodynamics Modeling of a Hydraulic Jump (ed.). Paper presented at European Fluid Mechanics Conference : 09/09/2012 - 13/09/2012. Paper presented at European Fluid Mechanics Conference : 09/09/2012 - 13/09/2012.
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2012 (English)Conference paper, Oral presentation only (Refereed)
National Category
Fluid Mechanics and Acoustics Applied Mechanics
Research subject
Fluid Mechanics; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-39332 (URN)e05ffd5b-8398-49ad-9546-50f5ae1534c2 (Local ID)e05ffd5b-8398-49ad-9546-50f5ae1534c2 (Archive number)e05ffd5b-8398-49ad-9546-50f5ae1534c2 (OAI)
Conference
European Fluid Mechanics Conference : 09/09/2012 - 13/09/2012
Note
Godkänd; 2012; 20121030 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Jonsson, P., Jonsén, P., Andreasson, P., Lundström, T. S. & Hellström, J. G. (2011). Smoothed particle hydrodynamics modeling of hydraulic jumps (ed.). In: (Ed.), E. Oñate; D.R.J. Owen (Ed.), Particle-based Methods – Fundamentals and Applications: . Paper presented at International Conference on Particle-Based Methods : fundamentals and applications 26/10/2011 - 28/10/2011 (pp. 490-501). Barcelona: International Center for Numerical Methods in Engineering (CIMNE)
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2011 (English)In: Particle-based Methods – Fundamentals and Applications / [ed] E. Oñate; D.R.J. Owen, Barcelona: International Center for Numerical Methods in Engineering (CIMNE), 2011, p. 490-501Conference paper, Published paper (Other academic)
Abstract [en]

This study focus on Smoothed Particle Hydrodynamics (SPH) modeling of twodimensional hydraulic jumps in horizontal open channel flows. Insights to the complex dynamics of hydraulic jumps in a generalized test case serves as a knowledgebase for real world applications such as spillway channel flows in hydropower systems. In spillways, the strong energy dissipative mechanism associated with hydraulic jumps is a utilized feature to reduce negative effects of erosion to spillway channel banks and in the old river bed. The SPH-method with its mesh-free Lagrangian formulation and adaptive nature results in a method that handles extremely large deformations and numerous publications using the SPH-method for free-surface flow computations can be found in the literature. Hence, the main objectives with this work are to explore the SPH-methods capabilities to accurately capture the main features of a hydraulic jump and to investigate the influence of the number of particles that represent the system. The geometrical setup consists of an inlet which discharges to a horizontal plane with an attached weir close to the outlet. To investigate the influence of the number of particles that represents the system, three initial interparticle distances were studied, coarse, mid and fine. For all cases it is shown that the SPH-method accurately captures the main features of a hydraulic jump such as the transition between supercritical- and subcritical flow and the dynamics of the highly turbulent roller and the air entrapment process. The latter was captured even though a single phase was modeled only. Comparison of theoretically derived values and numerical results show good agreement for the coarse and mid cases. However, the fine case show oscillating tendencies which might be due to inherent numerical instabilities of the SPH-method or it might show a more physically correct solution. Further validation with experimental results is needed to clarify these issues.

Place, publisher, year, edition, pages
Barcelona: International Center for Numerical Methods in Engineering (CIMNE), 2011
Keywords
Engineering mechanics - Fluid mechanics, hydraulic jump, smoothed particle hydrodynamics, sph, particle study, Teknisk mekanik - Strömningsmekanik
National Category
Fluid Mechanics and Acoustics Applied Mechanics
Research subject
Fluid Mechanics; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-28580 (URN)26a52819-1bc0-4917-8c3c-6fea8e4971f0 (Local ID)978-848992567-0 (ISBN)26a52819-1bc0-4917-8c3c-6fea8e4971f0 (Archive number)26a52819-1bc0-4917-8c3c-6fea8e4971f0 (OAI)
Conference
International Conference on Particle-Based Methods : fundamentals and applications 26/10/2011 - 28/10/2011
Note
Godkänd; 2011; Bibliografisk uppgift: II International Conference on Particle-based Methods – Fundamentals and Applications PARTICLES 2011 E. Oñate and D.R.J. Owen (Eds); 20111212 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Jonsson, P., Jonsén, P., Andreasson, P., Hellström, J. G. & Lundström, T. S. (2011). Smoothed particle hydrodynamics modellering av hydrauliska språng (ed.). Paper presented at Svenska mekanikdagar 2011 : 13/06/2011 - 15/09/2011. Paper presented at Svenska mekanikdagar 2011 : 13/06/2011 - 15/09/2011.
Open this publication in new window or tab >>Smoothed particle hydrodynamics modellering av hydrauliska språng
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2011 (Swedish)Conference paper, Oral presentation only (Other academic)
Keywords
Engineering mechanics - Fluid mechanics, Smoothed Particle Hydrodynamics, SPH, Hydrauliska språng, Teknisk mekanik - Strömningsmekanik
National Category
Fluid Mechanics and Acoustics Applied Mechanics
Research subject
Fluid Mechanics; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-30651 (URN)4863a641-a718-4f0e-b28b-0b3611394ceb (Local ID)4863a641-a718-4f0e-b28b-0b3611394ceb (Archive number)4863a641-a718-4f0e-b28b-0b3611394ceb (OAI)
Conference
Svenska mekanikdagar 2011 : 13/06/2011 - 15/09/2011
Note
Godkänd; 2011; 20110915 (patjon)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
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