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Smoothed particle hydrodynamics modeling of hydraulic jumps [Elektronisk resurs]

Jonsson, Patrick (författare)
International Conference on Particle-Based Methods : fundamentals and applications 26/10/2011 - 28/10/2011 
Jonsén, Pär (författare)
Andreasson, Patrik (författare)
Lundström, T. Staffan (författare)
Hellström, J. Gunnar I. (författare)
Luleå tekniska universitet Institutionen för teknikvetenskap och matematik (utgivare)
Luleå tekniska universitet Institutionen för teknikvetenskap och matematik (utgivare)
Barcelona International Center for Numerical Methods in Engineering (CIMNE) 2011
Ingår i: Particle-based Methods – Fundamentals and Applications. ; 490-501
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Sammanfattning Ämnesord
  • 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. 


Engineering and Technology  (hsv)
Mechanical Engineering  (hsv)
Fluid Mechanics and Acoustics  (hsv)
Teknik och teknologier  (hsv)
Maskinteknik  (hsv)
Strömningsmekanik och akustik  (hsv)
Engineering and Technology  (hsv)
Mechanical Engineering  (hsv)
Applied Mechanics  (hsv)
Teknik och teknologier  (hsv)
Maskinteknik  (hsv)
Teknisk mekanik  (hsv)
Strömningslära  (ltu)
Fluid Mechanics  (ltu)
Hållfasthetslära  (ltu)
Solid Mechanics  (ltu)

Indexterm och SAB-rubrik

Engineering mechanics - Fluid mechanics
hydraulic jump
smoothed particle hydrodynamics
particle study
Teknisk mekanik - Strömningsmekanik
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