Introductory FLUENT Training-Centrifugal Pump

Introduction

The Purpose of the tutorial is to model fluid flow in a centrifugal pump, which involves the use of rotation model.

Problem consists of a five blade centrifugal pump operating at 2160 rpm. The working fluid is water and flow is assumed to be steady and incompressible.

Due to rotational periodicity a single blade passage will be modeled.

Starting Fluent in Workbench

1. Open the Workbench (Start > Programs > ANSYS 12.0 > ANSYS Workbench)
2. Drag FLUENT into the project schematic
3. Change the name to Duct
4. Double click on Setup
5. Choose 3D and Double Precision under Options and retain the other default settings

Import Mesh

This starts a new Fluent session and the first step is to import the mesh that has already been created:

1. Under the File menu select Import> Mesh
2. Select the file tfa-pump-lite-cav-300k.msh and click OK to import the mesh
3. After reading the mesh, check the grid using Mesh>Check option

or by using Check under Problem Setup>General

Setting up the Models

1. Select Pressure Based, Steady state solver Problem Setup>General>Solver
2. Specify Turbulence model

Problem Setup > Models > Viscous

Double click and Select k-epsilon (2 eqn) under Model and Realizable under k-epsilon model and retain the default settings for the other parameters

1. Make sure that the Energy Equation is disabled

Problem Setup > Models> Energy

Materials

Define the materials.

Problem Setup > Materials

1. Click on air to open Create/Edit Materials panel
2. Change Name to water and Density and Viscosity to 1000 kg/m3 and 0.001 kg/(m-s) respectively
3. Click on Change/Create
4. Click on Yes, on being asked for Change/Create mixture and Overwrite air

Fluid Zone Conditions

Under Problem Setup >Cell Zone Conditions (operating conditions are also in BC panel) double click on Fluid

– Select Material Name : water

– Select Motion Type: Moving Reference Frame

– Specify Rotational Velocity : 2160 rpm

– Click on OK

Operating Conditions

Under Problem Setup >Cell Zone Conditions (operating conditions are also in BC panel)

Click on Operating Conditions… and set the Operating Pressure (Pascal) to 0

Boundary Conditions

Under Problem Setup > Boundary Conditions

1. Select inlet under Zone and choose velocity-inlet from the drop down menu under Type
2. Now double click on inlet under Zone

Input all the parameters in Momentum tab as shown below

Under Problem Setup > Boundary Conditions

1. Select outlet under Zone and choose pressure-outlet from the drop down menu under Type
2. Now double click on outlet under Zone

Input all the parameters in Momentum tab as shown below

http://www.cadfamily.com/html/Article/Introductory%20FLUENT%20Training-Centrifugal%20Pump_890_1.htm

http://www.cadfamily.com/html/Article/Introductory%20FLUENT%20Training-Centrifugal%20Pump_890_2.htm