Tutorial: Solving Transonic Flow over a Turbine Blade with Turbo-Specific NRBCs

Introduction
The standard pressure boundary conditions for compressible flow fix speci fic flow variables at the boundary (e.g., static pressure at an outlet boundary).
As a result, pressure waves incident on the boundary will reflect in an unphysical manner, leading to local errors. The effect are more pronounced for internal flow problems where boundaries are usually close to geometry inside the domain, such as compressor or turbine blade rows.

The turbo-specfiic non-reflecting boundary conditions (NRBCs) permit waves to pass through the boundaries without spurious reflections. The method used in FLUENT is based on the Fourier transformation of solution variables at the non-reflecting boundary.

This tutorial demonstrates how to do the following:

• Set up and solve the turbine blade flow field using the standard pressure outlet boundary treatment -

• Activate the turbo-specific NRBCs and solve the problem again

• Compare the results for the standard and non-reflecting pressure boundaries

Tutorial: Vane Pump Modeling in FLUENT

Introduction
This tutorial illustrates how to setup and run a vane pump analysis in FLUENT 6.3.This tutorial demonstrates how to do the following:

• Create an initial mesh

• Set up a problem for a dynamic mesh

• Specify the motion of dynamic zones using a compiled user-de fined function- UDF

• Preview the dynamic mesh before starting the calculation

• Perform transient dynamic mesh calculation

• Post-process the resulting data

Tutorial: Reacting Flow - Liquid Fuel Combustion

Introduction
This tutorial models the evaporation and combustion of a liquid fuel, using the dispersed phase modeling capability to compute coupled gas flow and liquid spray physics. The mixture-fraction/PDF equilibrium chemistry model is used to predict the combustion of the vaporized fuel. In this tutorial you will learn how to:

• Prepare a probability density function (PDF) file for a liquid fuel system

• Define FLUENT inputs for PDF chemistry modeling

• De fine a discrete second phase of evaporating liquid droplets

• Calculate the flow field using the pressure based solver, including coupling between the discrete - liquid fuel droplets and continuous phase

Tutorial: Solving a 2D Box Falling into Water

Introduction
The purpose of this tutorial is to provide guidelines and recommendations for setting up and solving a dynamic mesh (DM) case along with the six degree of freedom (6DOF) solver and the volume of fluid (VOF) multiphase model. The 6DOF UDF is used to calculate the motion of the moving body which also experiences a buoyancy force as it hits the water (modeled using the VOF model). Gravity and the buoyancy forces drive the motion of the body and the dynamic mesh This tutorial demonstrates how to do the following:

• Use the 6DOF solver to calculate motion of the moving body

• Use the VOF multiphase model to model the buoyancy force experienced by the moving body

• Set up and solve the dynamic mesh case

• Create TIFF files for graphic visualization of the solution

• Post-process the resulting data

Tutorial: Fuel Tank Sloshing

Introduction

The purpose of this tutorial is to investigate the free surface movement of liquid fuel in a tank under varying acceleration scenarios and to determine the most suitable configuration of the fuel tank to ensure continuous fuel supply through the pick-up pipe Two con configuration of the fuel tank are considered|tank with internal baffles and tank without internal baffles. You will compare the two configuration on the basis of liquid interface and velocity vector plots generated for each case.This tutorial demonstrates how to do the following Set up and solve a transient problem using the pressure-based solver and the VOF model Define parameters specific to the Non-Iterative Time Advancement (NITA) scheme Create a journal file to track the liquid interface with time Request automatic execution of commands to create images for post-processing Compare the two configuration on the basis of liquid interface and velocity vector plots generated.

Tutorial: Turbo Machinery - 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.

Tutorial: UDF - Temperature Dependent Viscosity

Introduction
This tutorial examines the flow of liquid metal through a two dimensional channel. The viscosity of the liquid metal is modeled as a function of the temperature using a user-defined function.

Tutorial: UDF - Sinusoidal Wall Temperature Variation

Introduction
This tutorial examines fluid flow through a two-dimensional channel, where one wall of the channel has a user-defined temperature profile applied to it. The purpose of this tutorial is to demonstrate the ability of FLUENT to use user-defined functions (UDFs) to specify a position-dependent variable on the wall boundary condition.

Tutorial: Broadband Noise Modeling

Introduction
The purpose of this tutorial is to provide guidelines and recommendations for the basic setup and solution procedure for solving an acoustics field generated from a sedan car using the broadband noise model. The problem is initially solved for steady state, and then the broadband acoustic model is included in the calculation to perform post-processing.

Tutorial: 2D Adiabatic Compression - Remeshing and Spring Smoothing

Introduction

This tutorial illustrates the setup and solution of a basic deforming mesh in FLUENT 6.2 using the remeshing and spring-based smoothing approaches.

The dynamic mesh model in FLUENT can be used to model flows where the shape of the domain changes with time due to motion on the domain boundaries. The motion can be either a prescribed motion (e.g., you can specify the linear and angular velocities about the center of gravity of a solid body with time), or an unprescribed motion where the subsequent motion is determined by a user-defined function (UDF). The update of the volume mesh is handled automatically by FLUENT at each time step based on the new positions of the boundaries. To use the dynamic mesh model, you need to provide a starting volume mesh and the description of the motion of any moving zone in the model.

In this tutorial, you will use the spring-based smoothing and remeshing mesh motion methods to update the volume mesh in the deforming region. For zones with a triangular or tetrahedral mesh, spring-based smoothing can be used to adjust the interior node locations based on known displacements at the boundary nodes. The spring-based smoothing method updates the volume mesh without changing the mesh connectivity.

When the boundary displacement is large compared to the local cell sizes, the cell quality may deteriorate or the cells may become degenerate. This leads to convergence problems when the solution is updated to the next time step. To circumvent this problem, FLUENT agglomerates poor-quality cells (cells that are too large, too small, or are excessively stretched) and locally remeshes the agglomeration.

Tutorial: 2D Adiabatic Compression - Layering

Introduction

This tutorial illustrates the setup and solution of a basic deforming mesh in FLUENT using the layering approach.

The dynamic mesh model in FLUENT can be used to model flows where the shape of the domain is changing with time due to motion on the domain boundaries. The motion can be either a prescribed motion (e.g., you can specify the linear and angular velocities about the center of gravity of a solid body with time) or an unsubscribed motion where the subsequent motion is determined through a user-defined function (UDF). The update of the volume mesh is handled automatically by FLUENT at each time step based on the new positions of the boundaries. To use the dynamic mesh model, you need to provide a starting volume mesh and the description of the motion of any moving zones in the model.

Tutorial: Compressible Flow over a Turbine Cascade

Introduction
The purpose of this tutorial is to provide guidelines and recommendations for solving a real world CFD problem which includes:

• Building the geometry and generating a mesh in GAMBIT

• Setting up the CFD model in FLUENT

• Solving the problem and comparing the results with the experimental data

The problem is to predict the performance of a highly-loaded linear transonic turbine guide vane cascade. The experimental measurements were performed at the Von Karman Institute for Fluid Dynamics.

Tutorial: Modeling cavitation around a torpedo

Introduction
This tutorial examines the the flow of water around a torpedo. Cavitation occurs in many applications as a result of flow acceleration over a body surface. Vapor production is localized at the wall where the pressure is below the vaporization pressure, so grid refinement and the use of non-equilibrium wall functions improve the accuracy of the simulation.

The case is taken from a paper by Kunz et al. Using FLUENT's multiphase modeling capability, you will be able to predict the inception of cavitation near the nose of the torpedo.

Tutorial: Projectile Moving Inside a Barrel

Introduction

The purpose of this tutorial is to illustrate how to set up and solve a problem using the following two features in FLUENT.

• Moving Deforming Mesh (MDM) using the layering algorithm.

• User-defined real gas law.

The problem involves a projectile moving through a barrel and out of the muzzle. The flow is assumed to be inviscid.

Tutorial: GAMBIT 2.3 Modeling Guide Volume 1 & 2

CREATING THE GEOMETRY
MESHING THE MODEL
SPECIFYING ZONE TYPES
USING THE MODELING TOOLS
VIRTUAL GEOMETRY