An Immersed Boundary–Lattice Boltzmann Approach to Study Deformation and Fluid–Structure Interaction of Hollow Sealing Strip

Abstract

A combined immersed boundary–lattice Boltzmann approach is used to simulate the dynamics of the fluid–structure interaction of a hollow sealing strip under the action of pressure difference. Firstly, the multiple relaxation times LBM model, hyper-elastic material model and immersed boundary method were deduced. According to the strain characteristics of hyper-elastic materials and the specific situation of friction between the elastic boundary and solid boundary, the internal force and the external force on the immersed boundary were discussed and deduced, respectively. Then, a 2D calculation model of the actual hollow sealing strip system was established, during which technical problems such as the equivalent wall thickness of the sealing strip and the correction of the stiffness of the contact corner were solved. The reliability of the model was verified by comparing results of FEM simulation of quasi-static deformation. Following this, the simulation results of three typical cases of sealing strips were presented. The results show that when the sealing strip fails, there will be a strong coupling phenomenon between the flow field and the sealing strip, resulting in the oscillation of the flow field and the sealing strip at the same frequency.

Application of immersed boundary-lattice boltzmann method in failure of automobile door sealing strip

“…Typically, sealing strips are attached to the door and are subject to a certain pre-compression load when the door is closed. At the same time, the part in contact with the door sheet metal will be affected by friction, so the force on the contact position between the sealing strip and the sheet metal needs special treatment, which has been mentioned in our previous study, 27 and the modeling here is consistent with it.…”

“…When the IB boundary is in contact with the wall, the normal force and frictional force of the IB boundary on the wall need to be considered, which can refer to our previous study. 27 Φ is the Dirac delta function defined as formula (7), and in IBM is typically in the following form 31 : shown in formula (8)…”

“…This paper uses IB-LBM to study the seal failure of fluid-structure interaction under dynamic pressure difference conditions. In previous modeling studies (citing our previous paper 27 ), an attempt has been made by using IB-LBM to simulate fluid-structure interaction of sealing strip, which solved a series of mathematics problems such as hyperelastic material mathematics, pre-compression, friction, etc. Based on the above research, this paper further refined the physical properties of uniform thin-walled sealing strips of actual vehicle doors, and solved practical modeling problems such as the thickness correction and pressure balance holes.…”

Effect of Transmission Lines Arrangement on Drag and Lift Coefficients: A Numerical Study

“…where ߩ is the fluid density, u is the fluid velocity, and ‫‬ is the fluid pressure. To calculate the flow, the lattice Boltzmann method is adopted [13][14][15][16][17][18][19][20][21][22][23][24], whose evolution equation is…”