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Title: A study of station keeping objects in water using comsol multiphysics
Authors: Tan, Simon Wei Hao
Keywords: DRNTU::Science
Issue Date: 2017
Abstract: The aim of this paper is to study how objects remain stationary in moving waters using the software COMSOL Multiphysics. In particular, we study existing examples in nature – fishes. As it is computationally more challenging to model the correct initial conditions for fishes to swim in the right way to stay stationary against oncoming water, we study instead fish swimming in stationary water and use the results in reverse to form conclusions. The first COMSOL application used is to confirm that fishes undulating a backwards travelling wave is more efficient than flapping (pure oscillation). In addition, we also confirmed the empirical equation that relates the undulating frequency to fish velocity for two-dimensional models. The second COMSOL application focuses on achieving the main aim of keeping fishes stationary in moving waters. The relationship between the changeable parameters, frequency and amplitude of the backwards travelling wave, and the drag force was determined. Also, the general shape and size of the structure was determined to be a major factor in reducing the drag force instead of the frequency and amplitude of undulation. Future works will focus more on the details of shape.
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Student Reports (FYP/IA/PA/PI)

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