10th International Congress on Information and Communication Technology

Authors - Nobuhiko Mukai, Yansheng Fang, Youngha Chang
Abstract - One of the most challenging issues is visualizing liquid behavior based on physical simulation since the boundary is clear while its shape dynamically changes. It is simpler to represent Newtonian fluid since the shearing stress is proportional to its shearing velocity. On the other hand, a lot of non-Newtonian fluids are there. One of the non-Newtonian fluids is viscoelastic fluid, which has two properties: viscosity and elasticity. The viscoelastic fluid shows a unique behavior of “spinnability”. If it is stretched, the middle part becomes narrow. Then, it rapidly shrinks after the rupture. The behavior is so complex that the constitutive equation has not been established. Therefore, spinnability simulation has been performed by defining the deviatoric stress that is combined with viscosity and elasticity. This paper introduces two methods to represent spinnability. One is a combination of deviatoric stress that is combined linearly with viscous and elastic stresses, where the weight of elastic stress depends on the strain of the fluid, and the other is a spring connection among particles that construct the fluid. Finally, the relationship between the acceleration to be added for stretching and the elongation of the fluid has been found by comparing the simulation results with real viscoelastic fluid.