A computational approach of locomotion, energy demand and dispersal of the common comatulid crinoid Promachocrinus kerguelensis (Echinodermata) and its circum-Antarctic success
This study is devoted to a comprehensive locomotion analysis of the feather star Promachocrinus kerguelensis. An idealised computational model of a swimming comatulid was derived from morphological measurements on crinoid specimens and their kinematics tracked on video footage. The information on P. kerguelensis' swimming performance, its pelagic life phase, their cost of living, the available food as a source of energy, and the ocean and tidal currents form the basis for a migration and dispersal model. read more >>>
Mathematical Modelling and Numerical Simulation of Locomotion of Limbless Organisms
This work takes the approach of a simple mathematical model derived from anatomy (musculoskeletal interaction) and the neuronal, cascading control of segmented organisms. It combines the advantages of wave movement of snakes and fishes with those of the peristaltic locomotion of worms. A key requirement is the simple description of the control pattern for the actuators in linear equations, so that small and inexpensive micro-controllers can process them quickly. The system of equations describes the respective movement patterns only by a series of coefficients that can be determined for the individual movement of an organism. Simulations illustrate the underlying model and provide the basis for a qualitative evaluation. read more >>>
Drag reduction in schooling fish? – a CFD approach
In this study, two-dimensional numerical simulations were carried out with up to nine individuals, focusing on flow conditions and interactions between individuals as well as the resistance distribution within the school. First, the behaviour of individual fish and the dynamics of a group were recorded experimentally. Using this information, an optimisation algorithm could be developed, which on the one hand simulates the mechanisms and the behaviour of a school, and on the other hand aims at a minimum total drag. read more >>>
Geometry optimisation for drag reduction of flow-through bodies with the use of evolution-strategic CFD simulation using the example of the 90° pipe bend
In this work, the applicability of an evolution strategy to a CFD (Computational Fluid Dynamics) flow simulation is examined using the example of tube bend optimisation. The diploma thesis of H. J. Lichtfuss, who carried out this experiment in the laboratory, serves as a model. Here, the shape of a 90° pipe bend is optimised by means of an (1+1)-evolution strategy changing the geometry with a fully developed turbulent flow. read more >>>
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