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Guidance to solve the problem: Fluid Flow and Heat Transfer in a Mixing

Elbow (2D) 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 StatementThe problem to be considered is shown schematically in the figure. A cold fluid at 293.15 K flowsinto the pipe through a large inlet, and mixes with a warmer fluid at 313.15 K that enters through asmaller inlet located at the elbow. The pipe dimensions, the fluid properties and boundary conditionsare given in SI units. What will be the properties of the outflow?

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Open the Workbench from starting menu

Double click on Fluid Flow (FLUENT) .

Right click on the Geometry and go to Properties .

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In Analysis Types choose 2D.

Double click on the Geometry and choose the unit for drawing.

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Select XY plane and sketch in XY plane .

Draw the given problem in Sketching with proper dimension

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Concept Surfaces from Sketches. (Click on sketch and apply)

Click on Generate , save the Project .

Split the face to 4 different faces for better meshing

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Save the Project and close the design modeller

Now double click on Mesh .

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Click on Geometry and go to Surface Body and change the Material as fluid.

Mesh Insert Sizing (Select highlighted edge Apply, then provide sizing data with Bias )

Mesh Insert Sizing (Select highlighted edges Apply, then provide sizing data)

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Mesh Insert Sizing (Select highlighted edge Apply, then provide sizing data with Bias )

Mesh Insert Sizing (Select highlighted edge Apply, then provide sizing data with Bias )

Mesh Insert Sizing (Select highlighted edge Apply, then provide sizing data with Bias )

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Mesh Insert Sizing (Select highlighted edges Apply, then provide sizing data)

Mesh Insert Sizing (Select highlighted edges Apply, then provide sizing data)

Mesh Generate mesh (by right click on Mesh )

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Now mesh will be looked as .

Mesh Insert Mapped Face Meshing

Select Geometry and click on Apply

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Select Edge

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

After giving name to all edges Export the mesh file.

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Select Fluent Input file from drop down box and save it by giving a proper name.

Open the fluent start menu with 2D option.

File Read Mesh

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General menu Scale (change into inch)

Models Energy Edit make it on

Models Viscous k -epsilon Model (Realizable )

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Material Fluid Create/Edit

From Fluent Database select Water-Liquid

In Cell-Zone Condition check whether Type is fluid or not ( Material Name to water-liquid)

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Boundary Conditions inlet large Edit provide velocity in x direction

Boundary Conditions inlet large Edit Thermal provide temperature value

Boundary Conditions inlet small Edit provide velocity in y direction

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Boundary Conditions inlet small Edit Thermal provide temperature value

Boundary Conditions outlet Edit provide pressure value

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 small)

File Write the initial Case and data file

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Run Calculation Calculate

File Write the final Case and data file

Graphics and Animations Contours Display temperature in all zones.