In this paper, we introduce a numerical method which utilizes immersed boundary to represent motion of solid object under effect of 3-dimension fluid flow. In the current method, we developed a numerical method for enforcing viscous boundary conditions on the immersed boundary. | Journal of Science & Technology 127 (2018) 040-044 An Immersed Boundary Method for Simulation of Moving Object in Fluid Flow Pham Van Sang Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Viet Nam Received: November 29, 2017; Accepted: May 25, 2018 Abstract Numerical modelling for the interaction between fluid flow interacting and moving object is a quite complicated problem in computational engineering. Such modelling requires solving simultaneously Navier-Stokes equation for fluid flow and Newton equation for object motion. Due to the motion, computational mesh needs to be re-generated in every time step, making the modelling complicated and time consuming. In this paper, we introduce a numerical method which utilizes immersed boundary to represent motion of solid object under effect of 3-dimension fluid flow. In the current method, we developed a numerical method for enforcing viscous boundary conditions on the immersed boundary. The method was validated and applied to simulate the inertial focusing of solid particle in spiral channel, obtained result well matches with experimental observation indicating the accuracy of the developed method. Keywords: Immersed boundary method, Newton equations, Inertial sorting, Dean flow 1. Introduction* a set of procedures which enforcing the conditions at the spatial location of structure-fluid boundary. The method was validated and applied to simulate the inertial focusing of solid particle in spiral channel, obtained result well matches with experimental observation indicating the accuracy of the developed method and showing feasible ability of applying the method in developing a numerical solver for predicting and optimizing design of microfludics sorting devices using in medicine. In computational fluid dynamics, simulations of fluid-structure interaction problems are normally obstructed by complexity of computational domain and the motion of the structure which leads to the change
