Step 5: Boundary Conditions

Boundary Conditions

1.   Retain the default settings for outlet.

Boundary Conditions outlet Edit...

2.   Set the conditions for velocity-inlet.

Boundary Conditions velocity-inlet Edit...

(a)   Retain the default selection of Magnitude, Normal to Boundary from the Velocity Specification Method drop-down list.

(b)   Retain the default selection of Absolute from the Reference Frame drop-down list.

(c)   Enter 0.02189 m/s for Velocity Magnitude.

(d)   Click the Thermal tab and enter 293 K for Temperature.

(e)   Click the Species tab.

i.   Set the Species Mass Fractions for ash3 to 0.4, ga $<$ch3 $>$3 to 0.15, and ch3 to 0 respectively.

(f)   Click OK to close the Velocity Inlet dialog box.

3.   Set the boundary conditions for wall-1.

Boundary Conditions wall-1 Edit...

(a)   Click the Thermal tab.

i.   Select Temperature in the Thermal Conditions group box.

ii.   Enter 473 K for Temperature.

(b)   Click OK to close the Wall dialog box.

4.   Set the boundary conditions for wall-2.

Boundary Conditions wall-2 Edit...

(a)   Click the Thermal tab.

i.   Select Temperature in the Thermal Conditions group box.

ii.   Enter 343 K for Temperature.

(b)   Click OK to close the Wall dialog box.

5.   Set the boundary conditions for wall-4.

Boundary Conditions wall-4 Edit...

(a)   Select Moving Wall in the Wall Motion group box.

(b)   Select Absolute and Rotational in the Motion group box.

(c)   Enter 80 rad/s for Speed.

(d)   Retain the other default settings.

(e)   Click the Thermal tab.

i.   Select Temperature in the Thermal Conditions group box.

ii.   Enter 1023 K for Temperature.

(f)   Click the Species tab.

i.   Enable Reaction.

ii.   Retain the selection of gaas-ald from the Reaction Mechanisms drop-down list.

(g)   Click OK to close the Wall dialog box.

6.   Set the boundary conditions for wall-5.

Boundary Conditions wall-5 Edit...

(a)   Select Moving Wall in the Wall Motion group box.

(b)   Select Absolute and Rotational in the Motion group box.

(c)   Enter 80 rad/s for Speed.

(d)   Click the Thermal tab.

i.   Select Temperature in the Thermal Conditions group box.

ii.   Enter 720 K for Temperature.

(e)   Click OK to close the Wall dialog box.

7.   Set the boundary conditions for wall-6.

Boundary Conditions wall-6 Edit...

(a)   Click the Thermal tab.

i.   Select Temperature in the Thermal Conditions group box.

ii.   Enter 303 K for Temperature.

(b)   Click OK to close the Wall dialog box.

8.   Disable diffusion at the inlet.

Models Species Edit...

(a)   Disable Inlet Diffusion and close the Species Model dialog box.

  You can also use the define/models/species/inlet-diffusion? text command to disable inlet diffusion. Enter no when asked if you want to include diffusion at the inlet.