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Manukau Institute of Technology

School of Professional Engineering

APPLIED COMPUTATIONAL MODELLING

Assignment 3 – Problem Developments

Semester 2 2018

This assignment weights 15% of the total mark. It marks out of 100 marks. Please check on Canvas for the due date.

Student Name: Ankush Thakur

Student ID: 170011102

Degree: Graduate Diploma in Mechanical Engineering

Course Name: Applied Computational Modelling

Year: 2018

Assessment: 3

Declaration:

By submitting this assessment, I Ankush Thakur, confirm that the work in this assessment is my own work. Any citations are appropriately referenced.

Signature:

Date of submission: 31/10/2018

Solution For Problem 1 :

Overview : For this problem we have to find the Turbulence Kinetic Energy, Static Pressure and Flow velocity with the help of CFX . Moreover, we have to find these at three different locations like at an angle of 30 degree, 60 degree and 90 degree of truck.

This problem is related to the assignment 1 so first of all import the geometry from assignment 1. As some of the fixed dimensions are there like

Height = 4m

Width = 3m

Length = 10m

Also the truck is placed inside the tunnel at the centre as show in the figure below having

Width = 4m

Length = 40m

Height = 6m

Creation of 3D Model and Mesh

As first of all geometry from first assignment imported and then converted according to the given condition .

Now open the mesh tab in CFX and create section names as

INLET

OUTLET

CAR

WALLS

Select the tunnel and truck and generate mess from the tool bar .

Now , Create boundary conditions in the set up as

Inlet

Car

Outlet

Wall

To create boundary condition for inlet

Set location as Inlet and choose option as Normal speed which is 120km/hour

To create outlet boundary condition

Set location as the Outlet and option for average static pressure which should be 0

To create boundary condition for walls

Set location as walls , set wall roughness , mass and momentum. Also select option as No slip wall and smooth wall.

To create boundary conditions for car

Set location named as Car and then set boundary details as mass momentum and wall roughness.

Now open the solution tab

To obtain the solution start Run program

Analyze Result and their Comparesion

Problem 2 :

Overview

As this problem is also related to the assignment 1 and in this we have to obtained the

Turbulence kinetic energy

Static Pressure

Flow velocity

There is also three different condition in which angle of the door of the garage will change in each condition that 30 degree, 60 degree, 90 degree at a speed of 50 meter per second.

Also the dimension for the car and garage are given as

Length of car = 2m

Height = 4m

Width = 2m

Width of garage = 5m

Height = 6m

Length = 8m

Model Setup and Solution :

First of all import the geometry from assignment and transform it according to the given shape and size. Create the model fluid and delete the solid one.

After that in CFX , open the mesh. Select the section and name them as

Inlet

Outlet

Walls

Car

Now generate mesh by clicking on the generate

Now create the boundary condition , name boundaries

Inlet

Outlet

Walls

Cars

For inlet Boundary condition

Make a inlet boundary condition and name location Inlet also choose option as normal speed of 50 meter/sec

For Outlet boundary

Set location to Outlet

To create boundary condition for Walls

Set location as walls choose option to No slip wall and smooth wall

Boundary Condition for Car

Set location as Car

Start Run

By closing all the tabs start run program to get the solution

RESULT and their Comparision

lefttop

PROBLEM 3 :

Overview :

For this problem we have to find out the turbulent kinetic energy, static pressure and flow velocity inside the tank and velocity (average) for flow coming out of the tank. As the volume of the tank is 3000 m3. Also there are two inlet(Q1,Q2) and one outlet (Q3).

Q1=250 l/m

Q2= 100l/m

At two different given conditions that is

Q2 is opposite to Q1 and Q3 as shown in figure 1

Q2 is 90 degree to Q1 and Q3

At the above given condition we have to find out the

Average velocity of Q3

Minimum and maximum internal pressure

Turbulent Kinetic energy

Velocity

Figure 1

Creation of model and mess :

To create the tank first of all create the circle of radius 7m and further by using extrude command extrude it to the depth of 19.4805 (on XY Plane)

After that select the ZX plane and construct two different circle of radius 0.1m and 0.08m having distance 1.948m and 12.987meter consecutively . Now by extrude command extrude the whole sketch to 10meter. After that draw a circle on the new sketch of radius 0.06meter on the distance of 9.7403 meter and extrude it to the depth of 10meter. On the completion of the geometry change the solid to fluid.

Open mesh in CFX also create section name as

Inlet 1

Inlet 2

Outlet

Walls

After that generate mess by clicking generate option on the toolbar

Boundary Conditions :

After mess select the set up and make boundary as

Inlet 1

Inlet 2

Outlet

Walls

Run Program:

To get the solution start run program.

Results

At 180 degree :

At 90 degree:

Problem 4

Overview:

To solve this problem we have to find out the flow velocity of the water on the different mass flow rate

5L/minute

10L/minute

15L/minute

Creation of 3D model and mesh

On XY Plane ,Construct a line AB =80mm

On point B construct another perpendicular line =13mm

Construct another Line of length =5mm

On the last point of line construct another perpendicular = 8mm

Increase the length of line = 50mm

Construct Perpendicular on the last point = 13mm

Increase length by = 5mm

Again construct perpendicular at the end = 29.95mm

Increase the length by =80mm

Revolve 1

On X axis Revolve 360 degree

Revolve 2 90 degree

With the help of extrude command

Radius =25.95mm

Then Extrude

Height = 100mm

Radius =12.5mm

Extrude again

Height = 80mm

Radius = 15mm

After completion of geometry create mesh in CFX as

Inlet 1

Outlet

Walls

Apply Boundary condition

Solution

x

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