Table of Contents

About this Manual.......................................................................... 6

Introduction...................................................................................... 7

Pre-processing..................................................................................... 8

Calculate............................................................................................ 10

Post-processing.................................................................................. 10

Tdyn Reference............................................................................. 12

Conditions.......................................................................................... 12

Conditions available in module RANSOL........................................ 13

Conditions available in module HEATRANS................................... 22

Conditions available in module ADVECT........................................ 24

Conditions available in module NAVAL.......................................... 25

Materials............................................................................................ 26

Fluid Material................................................................................. 27

Solid Material................................................................................. 36

Boundaries......................................................................................... 38

Fluid Body..................................................................................... 40

Fluid Boundary............................................................................... 44

Solid Boundary............................................................................... 46

Free Surface................................................................................... 47

Problem Data..................................................................................... 51

Problem......................................................................................... 51

Solver............................................................................................ 64

Units.............................................................................................. 69

Create Report tool.................................................................... 72

Tdyn Wizard....................................................................................... 74

Preliminary step (read or create the geometry based on standard layers)76

Create control volume......................................................................... 79

Define Data........................................................................................ 82

Generate Mesh................................................................................... 85

Calculate............................................................................................ 86

Postprocessing................................................................................... 88

Making Graphs................................................................................... 91

Reporting........................................................................................... 92

Update Sink and Trim Data................................................................ 94

Function Syntax............................................................................ 98

Turbulence modelling........................................................... 107

RANS equations and turbulence models............................................ 108

Classes of turbulence models available in Tdyn.................................. 109

Algebraic (or zero-equatjon) models (Smagorinsky and Mixing Length models) 109

One-equation models (Kinetic energy or k model and Spallart-Allmaras model) 110

Two-equation models (k-ε model, k-ω model, k-ω SST model, k-kt model) 110

Final recommendations on turbulence modelling................................. 112

Near wall-modelling............................................................... 114

Law of the Wall functions.................................................................. 118

Weaknesses of the k-ε model with wall functions............................... 119

Some comments on Boundary Conditions.................. 121

General guidelines on boundary conditions......................................... 121

Specification of turbulence quantities at an inlet.................................. 123

Stern flow modelling in transpiration problem125

Tdyn calculation files description.............................. 128

Problem files description................................................... 129

Executing Tdyn Solver........................................................... 130

References.................................................................................... 134

About this Manual

This is the reference manual of the program Tdyn. It consists of four parts,

Introduction, where the user can find the general aspects of the program.

The second part, Tdyn Reference, gives an explanation of every option available in Tdyn.

The third part, gives some recommendations about the best use of Tdyn.

The fourth part, is only intended for experienced users, and gives some details about the internal operation of the environment.

In this manual, different kinds of fonts are used to help the users follow all the possibilities offered by the program Tdyn:

font is used for the options found in the menus and windows.
font is used for fields found in the menus of Conditions, Materials, Boundaries and General Data.

In the following, a menu sequence will be indicated by the symbol '>' (i.e. Data>Problem type>tdyn2d corresponds to the menu sequence shown in Figure 2).

An option or tag available in a menu will be indicated by the symbol '|' (i.e. Fluid | Concentration Properties | Initial I refers to the property Initial I that appears under the tag Concentration Properties in the Fluid window of Tdyn).