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T.C. Baheehir University

03.28.2011

Term Project IIntroduction to CFD

0678821 Burak SUNAN

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TERM PROJECT I

LAMINAR FLOW IN A CHANNEL AND PIPE

Introduction

The object of the project is to obtain a CFD solution for the laminar flow in a channel and a pipe

by using above parameters with FLUENT.

Vm (m/s) D (m) L (m) Re M N

1 1,6 120 800 80 40

Vm: Velocity inlet

D: Planar Height (Pipe Diameter)

L: Planar (Pipe) Length

Re: Reynolds Number

M: row number of mesh

N: Column number of mesh

Laminar Channel Flow Calculation

The geometry and mesh are created in ANSYS 12.1 which is the preprocessor for FLUENT, and

the mesh is read into FLUENT and solved for the flow solution.

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Firstly, the analysis type is changed to 2D from 3D in order to solve channel and pipe flows from

Properties part before beginning to process geometry for a channel flow from FLUENT.

Secondly, the channel flow is drawn from geometry part. In details view, H1 is entered the flow

length 120 m and V2 is entered the flow height is 1.6 m.

Thirdly, the mesh is mapped with 80 rows and 40 columns from edge sizing parts and then the

channel flow is named as wall, symmetry, velocity inlet, and pressure outlet.

Fourthly, flow calculation data are initiated in setup section with double precision. Planar below

2D space from general part, is selected in order to specify a channel flow. Laminar is obtained

from models as a viscous model. In materials part, the air density and viscosity values are

changed to 1 kg/m3 and 0.002 kg/m-s. In the boundary conditions part, the velocity inlet

magnitude is specified 1 m/s and the other zones (pressure outlet, wall and symmetry) are

checked if they have right match. Therefore, calculation is run after all data entrances.

Laminar Channel Flow Results

Figure 1. Contour plots of X velocity

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Figure 2. Contour plots of pressure

Figure 3. XY plots of X versus X velocity along the centerline

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Figure 4. XY plots of Xvelocity versus Y at the pressure outlet

Figure 5. XY plots of pressure versus X along the centerline

Table 1. Drag force acting on the body

Forces Pressure

Zone Wall (0 25.032583 0)

Net (0 25.032583 0)

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Laminar Pipe Flow Calculation

In order to calculate the pipe flow, there is an easy way that duplicates the channel flow part

from FLUENT. Mainly, most of processes are same with the channel flow.

Firstly, Axisymmetric is chosen instead of planar in 2D Space part of Setup section. Rests of all

processes from geometry to contour results are same with the channel flow.

Laminar Pipe Flow Results

Figure 6.Contour plots of X velocity

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Figure 7.Contour plots of pressure

Figure 8.XY plots of X versus X velocity along the centerline

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Figure 9.XY plots of Xvelocity versus Y at the pressure outlet

Figure 10.XY plots of pressure versus X along the centerline

Table 2.Drag force acting on the body

Forces Pressure

Pipewall (-7.0948164e-14 0 0)

Net (-7.0948164e-14 0 0)

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Conclusion

Figure 11. Comparison_XY plots of Xvelocity versus Y at the pressure outlet

Figure 12. Comparison_XY plots of pressure versus X along the centerline

Above the figures, the dark lines show the pipe flow and white lines show the channel flow.

Therefore, we can easily see the pressure differences at the outlet and along the centerline

between the pipe and channel flows.