Tdyn manual


Tdyn

Environment for Multi-Physics simulation, including Fluid Dynamics, Turbulence, Heat Transfer, Advection of Species, Structural mechanics, Free surface and user defined PDE solvers.

Created with The GIMP

 

 


Reference Manual

© COMPASS Ingenierķa y Sistemas SA

info@compassis.com

8th Revision Tdyn 4.8 November 2003


TDYN REFERENCE MANUAL

 

Table of Contents

About this Manual.......................................................................... 7

Introduction...................................................................................... 8

Pre-processing................................................................................... 11

Calculate............................................................................................ 13

Post-processing.................................................................................. 14

Tdyn Reference............................................................................. 16

Conditions.......................................................................................... 16

Conditions available in module RANSOL........................................ 18

Conditions available in module HEATRANS................................... 32

Conditions available in module ADVECT........................................ 35

Conditions available in module URSOLVER................................... 39

Conditions available in module NAVAL.......................................... 43

Conditions available in module ALEMESH..................................... 44

Conditions available in module RAMSOLID................................... 45

Materials............................................................................................ 46

Fluid Material................................................................................. 47

Solid Material................................................................................. 56

Boundaries......................................................................................... 65

Fluid Body..................................................................................... 66

Solid Body..................................................................................... 76

Free Surface................................................................................... 83

Initial and Conditional Data................................................................. 87

Options available in RANSOL page................................................ 88

Options available in HEATRANS page........................................... 94

Options available in ADVECT page................................................ 95

Options available in URSOLVER page........................................... 96

Problem and Solver Data.................................................................... 98

Options available in PROBLEM page............................................. 98

Options available in ANALYSIS page.......................................... 100

Options available in RESULTS page............................................. 102

Options available in FLUID SOLVER page.................................. 106

Options available in SOLID SOLVER page.................................. 109

Options available in OTHER page................................................. 110

Modules Data................................................................................... 113

Options available in RANSOL page (General frame)..................... 113

Options available in RANSOL page (Turbulence frame)................ 114

Options available in HEATRANS page......................................... 119

Options available in ADVECT page.............................................. 120

Options available in URSOLVER page......................................... 121

Options available in NAVAL page................................................ 122

Options available in ALEMESH page........................................... 122

Options available in RAMSOLID page (General frame)................ 123

Options available in RAMSOLID page (Coupling frame)............... 124

Units Data........................................................................................ 125

Options available in IN/OUT page................................................ 125

Options available in GEOMETRY page........................................ 126

Options available in GENERAL page............................................ 126

Create Report tool................................................................. 128

Tdyn Wizard.................................................................................... 130

Preliminary step (read or create the geometry based on standard layers)132

Create control volume....................................................................... 135

Define Data...................................................................................... 138

Generate Mesh................................................................................. 141

Calculate.......................................................................................... 142

Postprocessing................................................................................. 144

Making Graphs................................................................................. 147

Reporting......................................................................................... 148

Update Sink and Trim Data.............................................................. 150

Units Syntax................................................................................... 154

Function Syntax.......................................................................... 158

Turbulence modelling........................................................... 170

RANS equations and turbulence models............................................ 171

Classes of turbulence models available in Tdyn.................................. 172

Algebraic (or zero-equation) models (Smagorinsky and Mixing Length models)   172

One-equation models (Kinetic energy or k model and Spallart-Allmaras model)  173

Two-equation models (k-ε model, k-ω model, k-ω SST model, k-kt model)      173

Final recommendations on turbulence modelling................................. 175

Near wall-modelling............................................................... 177

Law of the Wall functions.................................................................. 181

Weaknesses of the k-ε model with wall functions............................... 182

Some comments on Boundary Conditions.................. 184

General guidelines on boundary conditions......................................... 184

Specification of turbulence quantities at an inlet.................................. 186

Stern flow modelling in transpiration problem188

Tdyn calculation files description.............................. 191

Problem files description................................................... 192

Executing Tdyn Solver........................................................... 193

References.................................................................................... 197


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. It is strongly recommended to read this section before to start using Tdyn.

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:

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 page available in a menu will be indicated by the symbol '|' (i.e. Fluid | ADVECT | f2 refers to the property f2 that appears in the ADVECT page in the Fluid window of Tdyn).