CFD analysis

1. 3/18/2016NACTAE 16 SNGCET PAYYANUR 1
YOOSAF PP
L.B.S.C.E KASARAGOD
FLOW AND TEMPERATURE
DISTRIBUTIONS IN A VENTILATED
ENCLOSURE WITH VARIOUS INLET-
OUTLET CONFIGURATIONS

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

3. INTRODUCTION
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• 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
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• 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
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• 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

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VARIOUS ENCLOSURE CONFIGURATIONS

7. SOLUTION METHODOLOGY
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• 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.

8. GRID INDEPENDENCY TEST
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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

9. VALIDATION
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-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

10. RESULT AND DISCUSSION
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CONTOURS OF STREAM FUNCTION
Case 1 Case 2

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Case 3 Case 4

12. Case 5 Case 6
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13. CONTOURS OF STREAM FUNCTION
Stream functions along x axis. Stream functions along y axis.
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14. Temperature distribution along y axis.
CONTOURS OF TEMPERATURE
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15. CONCLUSION
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• Investigation of forced convection in a ventilated
enclosure with various inlet-outlet configurations.
• Computational studies shows different stream
functions and temperature profiles for various
enclosure configuration.
• The heat transfer is strongly affected by the flow
velocity and enclosure inlet-outlet opening
configuration.
• Comparative study clearly shows that the case 6 is
the best suitable flow field.

16. ANY QUESTIONS ???
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17. THANK YOU
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