Defining the Fluid Boundary and Initial Conditions

Specify conditions for the boundaries of the fluid region. Also, set the fluid initial temperature and velocity.

The gas entering the chimney is traveling at 0.2 m/s with a temperature of 600 K. The Reynolds number for this scenario is 1518, thus justifying the laminar flow model. Specify these boundary conditions under the inlet boundary node:
  1. Expand the Regions > Flue > Boundaries node.
  2. Edit the Inlet node and set the following properties:
    Node Property Setting
    Physics Values
    Static Temperature Value 600 K
    Velocity Magnitude Value 0.2 m/s

Set the outlet boundary to be at a static temperature of 283 K:

  1. Select the Outlet > Physics Values > Static Temperature node and set Value to 283 K.

For the decoupled case, assume that the inner wall is at a constant 380 K:

  1. Edit the HotGas node and set the following properties:
    Node Property Setting
    Physics Conditions
    Thermal Specification Condition Temperature
    Physics Values
    Static Temperature Value 380 K

Set initial conditions of 283 K and a constant velocity of - 0.2 m/s in the X direction:

  1. Edit the Continua > Fluid > Initial Conditions node and set the following properties:
    Node Property Setting
    Static Temperature Value 283 K
    Velocity Value [-0.2, 0.0, 0.0] m/s
  2. Save the simulation.