383 – CFD – FEA

You are required to complete the Computational Methods coursework (CFD & FEA) using ANSYS software and prepare a professional technical report. All work must be carried out individually.

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## 1. Student Information

Student ID: 202411578

From this ID:

– A = 8

– B = 7

– E = 78 GPa

– P = 8 GPa

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## 2. CFD Assignment

### Task 1: Flow Through a Bifurcated Tube

You are required to analyse water flow through a Y-shaped tube using Computational Fluid Dynamics (CFD).

#### Geometry:

– Inlet diameter = 2A = 16 cm

– Outlet diameters = A = 8 cm each

– Element size = 0.00BA = 0.0078 m

#### Requirements:

1. Build the geometry in ANSYS.

2. Generate a mesh with the specified element size.

3. Apply appropriate boundary conditions:

– Velocity inlet

– Pressure outlets

4. Perform simulations for:

– Laminar flow

– Turbulent flow

#### Analysis:

– Determine Reynolds number.

– Compare CFD results with theoretical and empirical data.

– Select a turbulence model (e.g., k- or k-) and clearly state its assumptions.

– (Optional for higher marks) Compare multiple turbulence models.

– Use flow conditions different from tutorial examples.

#### Outputs:

– Velocity contours

– Pressure contours

– Flow distribution

– Discussion of discrepancies and possible sources of error

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### Task 2: Laminar Flow in a Nozzle

You are required to model laminar flow through a sinusoidal nozzle.

#### Given:

– Inlet height = 0.2 m

– Flow area reduction = 20%

#### Requirements:

1. Create the nozzle geometry in ANSYS.

2. Apply laminar flow conditions.

3. Use multiple mesh sizes to demonstrate mesh independence.

4. Compare CFD results with classical theory:

– Parabolic velocity profile

– Entrance length

– Pressure drop per unit length

#### Outputs:

– Velocity profile plots

– Pressure distribution

– Mesh comparison results

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## 3. FEA Assignment

### Task 1: Tunnel Under

You are required to analyse a concrete tunnel under external pressure using ANSYS Workbench.

#### Material Properties:

– Youngs Modulus = 78 GPa

– Poissons Ratio = 0.15

#### Loading:

– External pressure = 8 GPa

#### Boundary Condition:

– Bottom of the tunnel is fixed

#### Requirements:

1. Model the geometry based on Figure 1.

2. Apply material properties and loading.

3. Perform structural analysis.

#### Outputs:

– Maximum deformation

– Maximum von Mises stress

– Stress distribution plots

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### Task 2: Truss Bridge Analysis

You are required to analyse a planar truss structure.

#### Material:

– Youngs Modulus = 78 GPa

– Poissons Ratio = 0.29

#### Cross Section:

– A B = 8 mm 7 mm

#### Loading:

– 30 kN applied at specified joints

#### Requirements:

1. Model the truss structure in ANSYS.

2. Apply loads and supports correctly.

3. Perform structural analysis.

#### Outputs:

– Deflection at each joint

– Structural deformation plot

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## 4. Report Requirements

Prepare a professional report (maximum 8 pages) including:

### Sections:

1. Abstract

2. Introduction

3. Theory and Methodology

4. Results and Discussion

5. Conclusion and Recommendations

### Important Notes:

– Include figures (mesh, contours, results)

– Compare theoretical vs simulation results

– Discuss errors and limitations

– Ensure proper academic writing and structure

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## 5. Submission Details

– Format: PDF

– Maximum length: 8 pages

– Submission via Moodle

– Deadline: 30 April 2026 14:00

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Ensure that all simulations are properly validated and results are clearly presented. The work should demonstrate strong understanding of both CFD and FEA principles, along with correct use of ANSYS tools.