Tangential streaming analysis on ultrasonically levitated droplet through the boundary layer approximation with moving particle semi-implicit and distributed point source method

Ultrasonic droplet levitation has recently been drawing attention as a way of non-contact transportation. Many experiment revealed that the shape changes or streaming field on the levitating droplets, however, quite small number of numerical simulation have discussed this phenomenon including fluid dynamics within the droplet. In this paper, the calculation result on a streaming field on the levitated droplet with rotational acoustic driver is discussed. The visco-acoustic torque originated in Reynolds stress as well as acoustic radiation force is input on a coupled analysis using distributed point source method (DPSM) and moving particle semi-implicit (MPS) method.