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| 2. |
- Fredriksson, Sam, 1966, et al.
(författare)
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MODEL TIDAL POWER IN A TURBULENT OCEAN
- 2018
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Ingår i: Oceanera-Net Final Conference, Edinburg, Scotland, 30-31 January 2018..
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Fredriksson, Sam T, et al.
(författare)
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Tidal power plant simulations using large eddy simulation (LES) and the actuator line method (ALM)
- 2018
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The share of the renewable energy in the gobal energy mix is to be increased according to the sustainable development goals of the UN. Tidal energy can here potentially play a substantial role for the electric power generation. The tidal power plant Deep Green developed by Minesto uses a novel technology with a “flying” kite that, with its attached turbine, sweeps the tidal stream with a velocity several times higher than he mean flow. Eventually these power plants will form arrays requiring knowledge of (1) the interaction between individual power plants as well as (2) how the power plants and the arrays will influence the surrounding environment. The tidally oscillating turbulent boundary layer flow is in the present study analyzed using Large Eddy Simulations (LES) utilizing two different modeling techniques (pseudo-spectral and finite volume method). The boundary layer flow is analyzed both undisturbed and with a sweeping tidal power plant. The power plant is modeled using the Actuator Line Method (ALM). This method has been reformulated in order to be able to take arbitrary pathways of the actuator line into account. The results for the undisturbed flow simulations show, e.g., variations of the turbulence intensity depending on pre- or post-tidal peak flow for equivalent volume mean flow. The results for the modeled power plant show, e.g., how the wake flow downstream of the power plant that can be related to the size of the pathway size.
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| 6. |
- Fredriksson, Sam, 1966, et al.
(författare)
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Turbulence Characteristics in Tidal Flows Using LES and ALM to Model the Tidal Power Plant Deep Green
- 2018
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Ingår i: 4th AWTEC, Taipei, Taiwan, 2018.
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Konferensbidrag (refereegranskat)abstract
- The turbulence in tidal flows affects the design and operation of tidal plants, e.g., through control system and dynamical loads. Present work is focused on a specific site west of Holy Island along the north west cost of Wales and a specific tidal power plant, Deep Green. Although, specific and applied, the work is generally applicable regarding findings and modelling techniques for other sites and designs. Large Eddy Simulations (LES) are used to study first the undisturbed tidal flow and then the flow with a power plant in operation. The undisturbed tidal flow simulations show that the turbulence characteristics differ between the acceleration and deceleration phase of the tidal cycle. The turbulence statistics are also used to estimate dynamical loads on the tidal plant with respect to, e.g., fatigue. Secondly, a novel Actuator Line Method (ALM) tidal power plant model, that e.g., takes the arbitrary trajectories of the power plant wing into account, is used. It’s used to study how the power plants affect the environment, available power downstream, and turbulence characteristics affecting other power plants in possible power plant arrays. It is shown that the width of the trajectory can be used as a measure to estimate the wake extent.
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