I built a model to investigate the case that viscous fluid from a pipe deforms on a horizontal surface. In the 2D axisymmetric model modified from the level set nozzle inkjet model, viscous fluid from a pipe enters a large cylinder which was all air. The inlet fluid velocity has a parabolic profile. The right vertical boundary is an outlet with constant pressure, and other boundaries are no slip walls. I attached two plots, where the red region is the fluid, and the blue region is air. The fluid puddle evolves fine, but at the right boundary, strange artifacts develop at later time, and will be more serious as time goes. I want to know how I can eliminate this artifact. I tried fixed mesh and adaptive mesh, but it does not help. Thanks.
↧