Tdyn: Modules

RANSOL

This module features the latest technology for solving real fluid flows in 3D (transient or steady), including turbulence effects. The fluid models available allow to solve from fully compressible to incompressible fluid flow problems and porous media flows (Stokes problem in solid materials).

Physical properties and other problem data used in this module can be defined in terms of any other variable of the problem (i.e. temperature, species concentration, …). This way it is possible to analyse fluids with variable viscosity or define external floatability forces acting on the fluid.

RANSOL module also allows to define non-linear Darcy’s law effects. Tdyn offers a choice of 14 different predefined turbulence models, including RANS, ILES (Implicit Large Eddy Simulation) and DES (Detached Eddy Simulation) types. It also allows the user to define new ones based on analytical expressions or by coupled systems of PDEs (URSOLVER module).

RANSOL module includes powerful tools for defining space varying, transient and advanced boundary conditions. This way, profiles of velocity and pressure can be specified on openings and walls.

Aerodynmics analysis of a sport car (courtesy SEAT Sport)

Glass bottle mould analysis (courtesy of Rexam-Glas)

HEATRANS

HEATRANS module is able to solve complex forced, natural, and mixed convection heat transfer in fluids and conduction in solids.

This module also includes conjugate heat transfer technology where calculation of thermal conduction through solid materials is coupled with the calculation of the temperature in the working fluids.

All the problem data can be defined in terms of any other variable of the problem. This way it is possible to analyse solids with variable heat capacity, define profiles of heat fluxes in walls or even simulate problems including phase change.

ADVECT

This module allows to solve problems of advection/diffusion of species in fluids, including reactive effects. It is also able to solve species diffusion problems in solids (Fick’s law).

ADVECT allows to define and track the evolution of a number of new species, being the physical properties and behaviour of the fluid flow defined in terms of the species concentration.

Tdyn incorporates finite calculus (FIC) algorithms to increase stability and accuracy of advection / diffusion problems.

URSOLVER

URSOLVER module is able to solve user-defined PDE problems in fluids and solids. This module allows to define a number of new variables (φ-phi problems) and specify and solve the differential equations that reign their behaviour. New user-defined problems can be coupled among them or with any other variable used in Tdyn (i.e. velocity, pressure, temperature, …).

URSOLVER module features a powerful Tcl interface enabling integration into design processes, faster completion of repetitive tasks and further extension of Tdyn capabilities. Tdyn Tcl interface provides an interpreter for the standard Tcl scripting language, enabling users to enhance simulations without recourse to external compiled subroutines. Furthermore, Tdyn Tcl interface allows access to advances features, including operations on internal structures and execution/communication with external programs.

ALEMESH

When fluid flow simulations involve changing geometry, ALEMESH moving mesh options can be used. This module includes several mesh updating strategies: prescribed / free bodies movement with automatic mesh updating, explicit 3D mesh movement via user functions and combinations of these strategies. These algorithms cover almost every conceivable mesh movement need.

ALEMESH module features advanced Arbitrary Lagrangian Eurelian (ALE) algorithms, offering faster and accurate results in problems with moving meshes. In cases where the interaction of a fluid around the solid is important, a fluid structure interaction (FSI) simulation can be performed.

In those cases, the necessary mesh update is carried out in an automatic way. FSI solver may include user defined driving forces, simulating constant or variable external actions.

Simulation of an IACC class hull (courtesy CADESA)

NAVAL

This module adds leading edge capabilities for the analysis of naval hydrodynamics problems.

NAVAL module is able to solve free surface equations, based on the transpiration technique, largely improving the resolution of the free surface deformation, even for coarse meshes.

ODDLS

ODDLS module features the leading overlapping domain decomposition level set technique, developed by Compass IS for free surface simulation.

This methodology is based on the application of domain decomposition techniques and allows increasing the accuracy of the free surface capturing (level set equation) as well as precisely solving governing equations in the interface between two fluids, taking into account surface tension effects. The greater accuracy in the solution of the interface between the fluids allows the use of non-structured meshes with larger elements in the free surface.

 ODDLS module includes optimised reinitialisation algorithms as well as robust mass conservation techniques, increasing the accuracy in capturing sharp interface between two fluids and allowing efficiently solving problems with large free surface deformation. 

Slamming simulation on waves (courtesy Nautatec)

RAMSOLID

If required, solid stress analysis may be performed by means of RAMSOLID module. In those cases, the structural analysis may be coupled with any other variable of the problem.

This module includes a simple and accurate method for analysis of thermo-mechanical problems.

PREPOST

Tdyn includes a fully integrated pre and post processing environment specifically designed for the creation and adaptation of analysis geometry, as well as the later visualization of results.

The pre-processing part allows the generation of complex geometries defined by typical CAD entities, such as NURBS or COONS surfaces, through the variety of tools available. In the same way, it is able to import standard CAD files in IGS and DXF formats among others.

PREPOST offers a consistent and intuitive interface for definition of boundary conditions, material properties and other data. Data definition is performed at geometry level, being independent of the mesh/es used in the analyses.

Tdyn meshing technology includes a suite of tools to create high-quality unstructured, structured and semi-structured meshes in an automatic way and verify the quality of the generated elements.

Aerodinamics of an aircraft (courtesy EADS)