An Investigation of Sloshing Inside Closed Aquaculture Plants PDF
Preview An Investigation of Sloshing Inside Closed Aquaculture Plants
An Investigation of Sloshing Inside Closed Aquaculture Plants Mona Tofte Marine Technology Submission date: June 2017 Supervisor: Trygve Kristiansen, IMT Co-supervisor: David Kristiansen, SINTEF Ocean AS Norwegian University of Science and Technology Department of Marine Technology An Investigation of Sloshing Inside Closed Aquaculture Plants Mona Tofte Spring 2017 MASTER’S THESIS Department of Marine Technology Norwegian University of Science and Technology Supervisor 1: Professor Trygve Kristiansen Supervisor 2: David Kristiansen M.Sc. thesis Spring 2017 Mona Tofte An Investigation of Sloshing Inside Closed Aquaculture Plants The aquaculture industry has seen extensive technological development over the last years where new fish farm cage designs have been proposed due to greater focus on environmental impact, efficiency and upscaling of the industry. To meet the growing demands, closed fish farm structures have been proposed as a solution. There are several prototypes and planned projects with closed aquaculture plants. Closing the fish farms makes it likely for the phenomenon of sloshing to occur. Sloshing affects the fish welfare, operations and requirements for structural strength. In that regard, Professor Trygve Kristiansen of the Department of Marine Technology, NTNU, has proposed a thesis concerning the effect of sloshing inside closed fish farm plants exposed to external waves. This subject is an opportunity for the student to work on both numerical and experimental hydrodynamics. The work will involve basic experiments in Lilletanken, as well as numerical work. The waves inside and outside the structure will interact, and sloshing waves are going to be excited. Basic examples will demonstrate this. Theoretical and numerical work will then be used to quantify these effects. Potential flow theory will be assumed. The work may be carried out in steps as follows: Present the governing equations and the basic theory describing the dynamics of a closed rigid aquaculture plant at sea considering two degrees of freedom assuming linear potential theory. Re-analyze data from the experiment conducted fall 2016 in the project thesis investigating sloshing inside a closed upright circular cylindrical fish tank subjected to regular waves. Create a numerical simulation of the free-surface elevation inside the closed aquaculture plant using linear modal theory assuming prescribed motions of the plant. Compare the numerical and experimental free-surface elevation inside the closed aquaculture plant. Perform a sensitivity analysis to investigate the sensitivity of the numerical calculated free-surface elevation inside the closed plant regarding the prescribed motions. Perform a coupled motion analysis of the given structure including sloshing. The candidate should in his/her report give a personal contribution to the solution of the problem formulated in this text. All assumptions and conclusions should be supported by mathematical models and/or references to physical effects in a logical manner. The candidate should apply all available sources to find relevant literature and information on the actual problem. The report should be well organized and give a clear presentation of the work and all conclusions. It is important that the text is well written and that tables and figures are used to support the verbal presentation. The report should be complete, but still as short and concise as possible. The final report must contain this text, acknowledgment, summary, main body, conclusion, suggestions for future work, nomenclature, references, and appendices. All figures and tables in the main body must be identified with numbers. References should be given by author name and year in the text, and presented alphabetically by name in the reference list. In the report, it should be possible to identify the work carried out by the candidate and what has been found in the available literature or new studies given to the candidate from other authors. It is important to clearly display the references to the original source for theories and experimental results. The report must be signed by the candidate. The thesis is to be submitted in DAIM. Supervisor: Professor Trygve Kristiansen Co-supervisor: David Kristiansen Start: 15.01.2017 Deadline: 11.06.2017 i Preface This thesis was submitted to the Norwegian University of Science and Technology (NTNU) as a part of my Master of Science degree at the Department of Marine Technology. The work has been carried out spring 2017 in collaboration with my fellow master student, Christian Kosacki, and was a continuation of the project thesis performed fall 2016. The idea behind the thesis was suggested by Prof. Trygve Kristiansen. The readers of this report should be familiar with basic hydrodynamics. Trondheim, June 11, 2017 Mona Tofte ii Acknowledgment The work has been carried out under the supervison of Professor Trygve Kristiansen at the DepartmentofMarineTechnology,NorwegianUniversityofScienceandTechnology(NTNU). His excellent guidance and support have been most appreciated and the present work would not have been possible without him. I would like to thank Terje Rosten and Torgeir Wahl for their advice and help with the experiment conducted fall in 2017 in the small towing tank at NTNU. I would also like to thank Alexander Timokha for help with understanding the theory of sloshing. Last, but not least, I would like to thank my fellow master candidate, Christian Kosacki, for his collaboration and great discussions throughout the work of this thesis. O.N. (MT)
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