Tdyn reference manual
Tdyn is an environment for multi physics simulation, using a stabilised (FIC) finite element method [[1],[2],[3],[4],[5]].
Tdyn includes different modules that allow to solve Heat Transfer in both solid and fluids (HEATRANS module), Turbulence (RANSOL module), Advection of Species in fluid and solids (ADVECT module), Structural mechanics (RAMSOLID module) and Free Surface (NAVAL module) problems using the same stabilised scheme mentioned above. Tdyn also includes a module for geometry and data definition and post-processing of the analysis results (PREPOST module) based in the Custom GiD system.
By using Tdyn it is also possible to configure additional user defined partial differential equations (PDE) solvers in both fluid and solid materials (URSOLVER module) and to couple them with any of the other problems.
Finally, ALEMESH module can be used to simulate problems where mesh deformation (i.e. body movement) may occur.
The different modules of Tdyn are fully integrated and the complete environment is used as one single program.
A more detailed explanation of the capabilities of every Tdyn module is given next.
RANSOL module is able to solve incompressible or slightly compressible fluid flow problems, including turbulence effects (RANS equations). It is also able to solve porous media flow (Stokes) problem in solid materials. Physical properties used in this module can be defined in terms of any other variable of the problem.
HEATRANS module is able to solve heat transfer problems in fluids and solids. Physical properties used in this module can be defined in terms of any other variable of the problem.
ADVECT module is able to solve species advection problems in fluids. It is also able to solve species diffusion problems in solids. This module allows to define a number of new species which behaviour can be coupled among them or with any other variable (i.e. velocity, pressure, temperature, …) used in Tdyn. Physical properties used in this module can be defined in terms of any other variable of the problem.
URSOLVER module is able to solve used defined PDE problems in fluids and solids. This module allows to define a number of new variables (called φ-phi problems) and specify and solve the differential equation that reigns its behaviour. New user-defined problems can be coupled among them or with any other variable (i.e. velocity, pressure, temperature, …) used in Tdyn.
ALEMESH module include all the necessary capabilities to solve problems with mesh updating techniques. This module includes several mesh updating techniques and arbitrary lagrangean eurelian (ALE) algorithms for solving systems of equations.
RAMSOLID module is able to solve solid structural problems. Structural problems can be coupled with any other variable of the problem (i.e. temperature).
NAVAL module is able to solve free surface equations, based on the transpiration technique. This module is specially adequate to solve naval hydrodynamics problems.
The analysis of a problem by means of Tdyn, consists of the following basic steps (see Figure 1):
· Pre-processing
i. Creation (or importation) of the geometry to be analysed
ii. Assignment of the material properties, boundary conditions and definition of general data
iii. Mesh generation
· Calculation
Figure 1. Steps to be done in the analysis of any FE problem |