Setting the Boundary Conditions
The coal particles transport air enters the computational domain through a velocity inlet boundary at a constant velocity of 23 m/s. The combustion air flows in as a radial velocity profile with a swirl around the axis. You specify this velocity profile as a radial table with respect to a local cylindrical coordinate system.
To set the boundary conditions:
-
Edit the
node and set the following properties:
Node Property Setting Physics Conditions Turbulence Specification
Method Intensity + Length Scale Physics Values Radiation Temperature
Value 343.15 K Species Mass Fraction
Value - N2: 0.767
- O2: 0.233
Static Temperature
Value 343.15 K Surface Material
Surface Material Inlet Ducts Turbulence Intensity
Value 0.1 Turbulent Length Scale
Value 6.5 mm Velocity Magnitude
Value 23.0 m/s -
Edit the COMBUSTIONAIRINLET node and set the following
properties:
Node Property Setting Physics Conditions Turbulence Specification
Method Intensity + Length Scale Velocity Specification
Method Components Physics Values Radiation Temperature
Value 573.15 K Species Mass Fraction
Value - N2: 0.767
- O2: 0.233
Surface Material
Surface Material Inlet Ducts Turbulence Intensity
Value 0.2 Turbulent Length Scale
Value 2.35 cm Velocity
Method Table (r) Coordinate System Laboratory -> Cylindrical 1 Table (r)
Table AirInletProfile Table: X-Data V-radial Table: Y-Data V-theta Table: Z-Data V-z -
Select the OUTLET node and set the following
properties:
Node Property Setting Physics Values Radiation Temperature
Value 300 K Surface Material
Surface Material Furnace -
Set the thermal specifications at the coal combustor walls.
- Save the simulation.