Motion Analysis of Micro-Swimmers in Liquid with a Low Reynolds Number

The main purpose of this research is to provide a basic idea for controlling micro-swimming robots. This report is focused on exploring the way micro-swimmers move in a liquid environment with a low Reynolds number and how their physical parameters affect their speed of movement and finally, simulate the movement trajectory of cells. In conclusion, the way of motion of a cell is divided into “Run Phase” and “Tumble Phase”, and cells move at different speeds in different states. Additionally, the relationship between the speed of cells and the pitch angle of the tail flagella is roughly a quadratic function with the opening facing downwards, which helps to control the speed of micro-swimmers. Lastly, the trajectory of a cell is simulated based on the analysis above and the results showed that they matched perfectly.