## Chapter 1: Basic Solver Capability Theory

This chapter describes the mathematical equations used to model fluid flow, heat, and mass transfer in ANSYS CFX for single-phase, single and multi-component flow without combustion or radiation. It is designed to be a reference for those users who desire a more detailed understanding of the mathematics underpinning the CFX-Solver, and is therefore not essential reading. It is not an exhaustive text on CFD mathematics; a reference section is provided should you want to follow up this chapter in more detail.

This chapter describes:

- Documentation Conventions
- Governing Equations
- Buoyancy
- Immersed Solids
- Multicomponent Flow
- Additional Variables
- Rotational Forces
- Sources
- Boundary Conditions
- Automatic Time Scale Calculation
- Mesh Adaption
- Flow in Porous Media
- Wall and Boundary Distance Formulation
- Wall Condensation Theory

For information on dealing with multiphase flow:

- Multiphase Flow Theory

- Particle Transport Theory

For information on combustion and radiation theory:

- Combustion Theory

- Radiation Theory

Descriptions of the theory for other physical models are provided in:

- Turbulence and Wall Function Theory

- GGI and MFR Theory

- Transient Blade Row Modeling Theory

- Electromagnetic Hydrodynamic Theory

- Rigid Body Theory

- Discretization and Solution Theory

Recommended books for further reading on CFD and related subjects:

- Further Background Reading in the CFX Introduction

Release 18.2 - © ANSYS, Inc. All rights reserved.