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.
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Reference Manual
© COMPASS Ingenierķa y Sistemas SA
info@compassis.com
8th Revision Tdyn 4.8 November 2003
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
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).