Introduction to ANSYS Fluent

All CFD simulations follow the same key stages. This lecture will explain how to go from the original planning stage to analyzing the end results

You will learn:
• The basics of what CFD is and how it works
• The different steps involved in a successful CFD project

Computational Fluid Dynamics (CFD) is the science of predicting fluid flow, heat and mass transfer, chemical reactions, and related phenomena.
To predict these phenomena, CFD solves equations for conservation of mass,momentum, energy etc..

Cell Zone and Boundary Conditions

The problem definition for all CFD simulations includes boundary conditions, cell zone conditions and material properties. The accuracy of the simulation results depends on defining these properly

• How to define material properties
• The different boundary condition types in Fluent and how to use them
• How to define mesh interfaces
• How to define cell zone conditions in Fluent including solid zones and porous media
• How to specify well-posed boundary conditions

Post-processing

The purpose of CFD analysis is to obtain quantitative and/or qualitative information about fluid flow performance of the system. This lecture will explain how to do this both in CFD-Post and within Fluent

• How to perform flow field visualization and quantitative data analysis on your CFD results
• How to do this in Fluent and in CFD-Post

Solver Settings

Fluent requires inputs (solver settings) which determine how the solution is initialized and calculated. While default settings can be used for many cases, understanding the role of the most important settings will help to ensure optimal solution convergence.Emphasis will be placed on convergence, which is critical for the CFD simulation.

• How to specify the solver and set the discretization schemes
• How to initialize the solution
• How to monitor and judge solution convergence

Turbulence Modeling

The majority of engineering flows are turbulent. Simulating turbulent flows in Fluent requires activating a turbulence model, selecting a near-wall modeling approach and providing inlet boundary conditions for the turbulence model.

• How to use the Reynolds number to determine whether the flow is turbulent
• How to select the turbulence model
• How to choose which approach to use for modeling flow near walls
• How to specify turbulence boundary conditions at inlets

Heat Transfer

Heat transfer has broad applications across all industries. All modes of heat
transfer (conduction, convection – forced and natural, radiation, phase change) can be modeled in Fluent and solution data can be used as input for one-way thermal FSI simulations.

• How to treat conduction, convection (forced and natural) and radiation in Fluent
• How to set wall thermal boundary conditions
• How to export solution data for use in a thermal stress analysis (one-way FSI)

Transient Flow Modeling

Performing a transient calculation is in some ways similar to performing a steady state calculation, but there are additional considerations. More data is generated and extra inputs are required. This lecture will explain these inputs and describe transient data post-processing.

• How to set up and run transient calculations in Fluent
• How to choose the appropriate time step size for your calculation
• How to post-process transient data and make animations

In addition to the fundamental task of solving the Navier-Stokes equations, most CFD
calculations also involve the use of one or more physical models. Understanding the models
available in Fluent and the background theory helps you make the right choices in your own project.














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