Microorganism model for simulating its motion is proposed in this work. It consists of granular particles which can interact to each other through linear and bending spring mimicking microorganism muscles. As some parts of the organism are moving, they will also push the surrounding fluid through Stokes’ force. Gravity influence is simply neglected. All these forces are used to get motion parameters of organism through molecular dynamics method with improved Euler algorithm. It is observed that the use of simplify to push-pull organ gives more effective motion than shrink- and swell-organs as reported in previous works. Comparison of use of single and multiple push-pull filaments are discussed here, where the single one requires phase difference between alternation of length of filament and drag coefficient of some sub-parts. It is observed that synchronization between locomotive organs is required in order to produce circular motion, while a value could produce no motion at all.

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