Nikhil Narale
Ansys Employee



Here are few settings that came to my mind:

  • Turn on gravity and define fluid density variation for modeling buoyancy effect (Just in case if you want to model the effect of change in density with temperature and the buoyancy effect) 
  • Assign solid material properties (density, k, cp)
  • Use coupled wall (CHT) between fluid and solid. I would recommend to share the faces at the CAD/Meshing stage (share topology)
  • Apply either constant temperature (which should be different from the ambient temperature ; you will have to consider convective resistance) or convection boundary condition on outer tube walls with appropriate htc and ambient temperature of 22 DegC.
  • Initialize (patch) fluid temperature at 350°C
  • Choose a suitable time step size and number of time steps (ball park figure for now) and start the simulation, monitoring the time and the fluid temperature.