Rayleigh taylor in fluent

- January 31, 2024 at 10:28 pm
  
  Gunnuz Tech
  Subscriber
  
  I try to solve rayleigh taylor instability phenomenon in ansys. The properties are similar to this
  http://gerris.dalembert.upmc.fr/gerris/examples/examples/rt.html The problem is hwen I run the case in ansys, the lower fluid starts to penetrate in the upper one in the form of two mushrooms, please see screenshot. If anyone can help where should I check?
- February 1, 2024 at 8:44 am
  
  NickFL
  Subscriber
  
  What are the boundary conditions you have on the walls? It almost looked fixed boundary condition, you probably want symmetric. Also is this a 2D simulation?
- February 1, 2024 at 8:59 am
  
  Gunnuz Tech
  Subscriber
  
  I have added symmetry and walls while meshing (please see picture attached). but did not say anything about the Bounday conditions in the fluent setup. Is this enough or do I need anything else?
- February 1, 2024 at 9:02 am
  
  Gunnuz Tech
  Subscriber
  
  and yes the simulation is 2D. My end goal is to solve in axisymmetric but first I am trying to run in 2D.