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Guidance to solve the problem: Laminar Fluid Flow through a Pipe with

Circular Cross Section (3D) using Ansys

The document is made by Kumar Samal (Roll No. 514ME1007, Institute

Research Scholar) and Dr. Suman Ghosh (Assistant Professor)

Department of Mechanical Engineering

National Institute of Technology Rourkela, Rourkela-769008, Odisha, India

Problem StatementConsider fluid flowing through a circular pipe of constant radius. The pipe diameter D= 0.2 m and

length L= 8 m. Consider the inlet velocity to be constant over the crosssection and equal to 1 m/s.

The pressure at the pipe outlet is 1 atm. Take density = 1 kg/ m3and coefficient of viscosity = 2

103kg/(ms). These parameters havebeen chosen to get a desired Reynolds number of 100 and don't

correspond to any real fluid.

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Open the Workbenchfrom starting menu.

Double click on Fluid Flow (FLUENT).

Right click on the Geometryand go to Properties.

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In Analysistypeschoose 3D

.

Double click on the Geometryand choose the unitfor drawing.

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Select XY plane and sketch in XY plane.

Draw a circle in Sketchingwith proper dimension.

Click on Extrude

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Provide extrude data.

Click on Generate, save the Projectand close the design modeller.

Now double click on Mesh.

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Click on Geometryand go to Surface Body and change the Materialas fluid.

Mesh Insert Method. (Select geometry and click on Apply)

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In Methodselect Tetrahedronsas mesh type

Select Geometry Apply.

Click Meshin project Sizingfrom Details of Mesh. (give sizing data)

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Now click on Generate Mesh

Select Face

Select the face, right click on it and click on Create Named Section.

After giving name to all faces Exportthe mesh file.

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Select Fluent Input file from drop down box and save the mesh file with a proper name.

Open the fluent start menu with 3D option.

File Read Mesh

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In Generalmenu turn on Gravity and provide its value.

Material Fluid Create/Edit

In Cell-Zone Condition check whether Typeis fluid or not (Material Name to air)

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Boundary Conditions inlet

Boundary Conditions outlet

Solution Methods (keep all default)

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Solution Controls (keep all default)

Monitors Residuals Edit (make all scaled residual as 1e-06)

Solution Initialization. (From inlet)

File Writethe initial Case and data file

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Plots XY Plot ChooseVelocityand Velocity Magnitudein Y axis Function and draw itat mid-plane.

Graphics and Animations ContoursDisplay pressure in mid-plane.