CFD

1. 8/8/2016FAME 2K16 1
YOOSAF PP
B.Tech student
L.B.S.C.E KASARAGOD
CFD ANALYSIS OF VENTILATED
ENCLOSURE WITH VARIOUS
CONFIGURATIONS

2. OVERVIEW
2
• INTRODUCTION
• MATHEMATICAL FORMULATION
• GOVERNING EQUATIONS
• SOLUTION METHODOLOGY
• RESULTS AND DISCUSSION
• CONCLUSION

3. INTRODUCTION
3
• Ventilation is the process of supplying and removing
air by natural or mechanical means to and from a
building.
• Effective ventilation means providing comfort
operating condition.
• Experimental approach.
• Theoretical approach.
1. Analytical.
2.Computational.

4. MATHEMATICAL FORMULATION
4
• Dimension = 8×6.
• Inlet velocity = 0.5 m/s
• Inlet air temperature = 295 K
• Ambient temperature = 300 K
• Operating temperature = 305 K
• Flow are governed by the continuity equation,
Navier–Stokes equation and energy equations.

5. GOVERNING EQUATIONS
5
• Continuity equation
𝜕𝑢
𝜕𝑥
+
𝜕𝑣
𝜕𝑦
= 0
• X momentum equation
𝑢
𝜕𝑢
𝜕𝑥
+ 𝑣
𝜕𝑢
𝜕𝑦
= −
1
𝜌
𝜕𝑝
𝜕𝑥
+ 𝜈
𝜕2
𝑢
𝜕𝑥2
+
𝜕2
𝑢
𝜕𝑦2
• Y momentum equation
𝑢
𝜕𝑣
𝜕𝑥
+ 𝑣
𝜕𝑣
𝜕𝑦
= −
1
𝜌
𝜕𝑝
𝜕𝑦
+ 𝑔 𝑦 + 𝜈
𝜕2
𝑣
𝜕𝑥2
+
𝜕2
𝑣
𝜕𝑦2
• Energy equation
𝑢
𝜕𝑇
𝜕𝑥
+ 𝑣
𝜕𝑇
𝜕𝑦
=
𝑘
𝜌𝑐 𝑝
𝜕2
𝑇
𝜕𝑥2
+
𝜕2
𝑇
𝜕𝑦2

6. GEOMETRIC MODELING
6
I. Inlet position parametric variations.
II.Outlet position parametric variations.
III.Inlet size parametric variations.
IV.Outlet size parametric variations.

7. 1. INLET POSITION PARAMETRIC VARIATIONS.
7
Case 1 Case 2
Case 3 Case 4

8. 2. OUTLET POSITION PARAMETRIC VARIATIONS.
8
Case 1 Case 2
Case 3
Case 4

9. 3. INLET SIZE PARAMETRIC VARIATIONS.
9
Case 1 Case 2
Case 3 Case 4

10. 4. OUTLET SIZE PARAMETRIC VARIATIONS.
10
Case 1 Case 2
Case 3 Case 4

11. SOLUTION METHODOLOGY
11
• The governing equations are solved by
computational procedure.
• Computational fluid dynamics (CFD) software
provides the smooth solutions at the interior
domain including the corner regions.
• The computational code has been validated by
comparing the numerical results obtained by
computational analyses with the available
benchmarks problem.

12. GRID INDEPENDENCY TEST
12
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 2 4 6 8 10 12
STREAMFUNCTION
DISTANCE (m)
Stream function-Distance
10x10
20x20
40x40
80x80
160x160
200X200

13. VALIDATION
13
-0.02
0
0.02
0.04
0.06
0.08
0.1
0.12
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Distance
Pressure
p-comp1
p-analytical

14. RESULT AND DISCUSSION
14
 Contours of Stream function
 Stream function characteristics
 Temperature characteristics

15. 15
CONTOURS OF STREAM FUNCTION
1. Inlet position parametric variations.
Case 1 Case 2
Case 3 Case 4

16. 16
2. Outlet position parametric variations.
Case 1 Case 2
Case 3 Case 4

17. 17
3. Inlet size parametric variations.
Case 1 Case 2
Case 3 Case 4

18. 18
4. Outlet size parametric variations.
Case 1 Case 2
Case 3 Case 4

19. STREAM FUNCTION CHARACTERISTICS
19
2.Outlet position parametric variations.
1. Inlet position parametric variations.
0
0.5
1
1.5
2
0 5 10
Distance
Stream function
Stream function X
Series1
Series2
Series3
Series4
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 2 4 6 8
Distance
Stream function
Stream function Y Series1
Series2
Series3
Series4
0
0.5
1
1.5
2
0 5 10
Distance
Stream function
Stream function X
Series1
Series2
Series3
Series4
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 5 10
Distance
Stream function
Stream function Y
Series1
Series2
Series3
Series4

20. 20
3. Inlet size parametric variations.
0
0.5
1
1.5
2
2.5
3
0 5 10
Distance
Stream function
Stream function X
Series1
Series2
Series3
Series4 0
0.5
1
1.5
2
2.5
0 5 10
Distance
Stream function
Stream function Y
Series1
Series2
Series3
Series4
4. outlet size parametric variations.
-0.5
0
0.5
1
1.5
2
0 5 10
Distance
Stream function
Stream function X
Series1
Series2
Series3
Series4
0
0.5
1
1.5
0 5 10
Distance
Stream function
Stream function Y
Series1
Series2
Series3
Series4

21. TEMPERATURE CHARACTERISTICS
21
1. Inlet position parametric variations.
294.5
295
295.5
296
296.5
297
297.5
0 1 2
Temperature
Distance
Temperature X
Series1
Series2
Series3
Series4 294.997
294.998
294.999
295
295.001
295.002
0 1 2
Temperature
Distance
Temperature Y
Series1
Series2
Series3
Series4
2.Outlet position parametric variations.
294.5
295
295.5
296
296.5
297
297.5
0 1 2
Temperature
Distance
Temperature X
Series1
Series2
Series3
Series4 294.9985
294.999
294.9995
295
0 5 10
Temperature
Distance
Temperature Y
Series1
Series2
Series3
Series4

22. 22
3. Inlet size parametric variations.
294
295
296
297
298
0 2 4
Temperature
Distance
Temperature X
Series1
Series2
Series3
Series4
294.9985
294.999
294.9995
295
0 5 10
Temperature
Distance
Temperature Y
Series1
Series2
Series3
Series4
4. outlet size parametric variations.
294
295
296
297
298
299
300
301
0 1 2 3
Temperature
Distance
Temperature X
Series1
Series2
Series3
Series4
294.5
295
295.5
296
296.5
0 5 10
Temperature
Distance
Temperature Y
Series1
Series2
Series3
Series4

23. CONCLUSION
23
• Numerical investigation, Specified parametric
configurations and boundary conditions by using
CFD.
• Objective, Stream functions and temperature
variations for various enclosure configuration.
• The heat transfer is strongly affected by the flow
velocity and enclosure inlet-outlet opening
configuration.
• The results obtained are found to be expected and
qualitatively comparable.
• Future of present work.

24. ANY QUESTIONS ???
24

25. THANK YOU
25