A novel immersed boundary-lattice Boltzmann method for fluid-structure interactions involving viscoelastic fluids

This work presents a novel immersed boundary-lattice Boltzmann method for fluid-structure interactions involving viscoelastic fluids. This method has been validated by conducting a few typical viscoelastic flows: 2D lid-driven cavity, a 2D rigid particle migration in Couette flow, a 3D rigid particle rotation in shear flow and a 3D rigid particle sedimentation. The present results show good agreement with previous results from different sources. The present method has been also applied to several problems involving fluid-structure interactions: a 2D elastic capsule deformation in the viscoelastic fluid shear flow, a 3D elastic capsule deformation in the viscoelastic fluid shear flow, and a 3D flexible plate motion in the viscoelastic fluid uniform flow. The results suggest that the viscoelasticity of the fluids has great effects on the behaviours of the elastic capsules and flexible plate.