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Dytran

Simulate and analyze complex interaction of fluids and structures

Dytran is a system for analyzing highly nonlinear fast-flowing processes associated with the interaction of structure and fluid (gas) or structure and structure.

The program allows you to solve a wide range of problems related to fast-flowing processes (simulation of structural collisions, blade failures, etc.).

Dytran is used in automotive, aerospace, defense, manufacturing and many other industries.

Distinctive features of Dytran are joint work of Lagrange solvers (solid modeling) and Euler solvers (fluid/gas modeling), a wide range of material models (including hydrodynamic) and different types of equations of state for fluid medium (gas). It is possible to simulate material performance with shear stiffness in Eulerian formulation. This allows to model physical phenomena with unbounded deformations, various hydrodynamic processes, including water hammer, as well as to solve problems of modeling and analyzing special dynamic effects on a structure (explosion, impingement, etc.).

Examples of typical applications are the interaction between airbag and passenger, car and obstacle in car crash, bird/airplane collision, explosion inside a container on board an aircraft, ship collision and grounding, projectile impact and penetration, meteorite hitting a spacecraft shell, metal sheet stamping, liquid behavior in not fully filled volume (tanks, tanks) and a number of similar problems.

Dytran supports many different models of material fracture. It is possible to simulate the fracture process of metals, layered composite materials, including ceramics.

The implementation of a completely new approach to computational modeling of Underwater Shock Explosion allows to simulate such complex physical phenomena as underwater explosions (including those with charges of different power distributed in space and different times of actuation) and shock wave propagation in liquids.

A distinctive feature of Dytran is the ability to model the dynamic interaction between fluid and structure in a particularly efficient way: fluid viscosity can be taken into account; the number of fluids with different properties in one model is not limited, but it should not exceed 10 within one grid cell; automatic construction of Eulerian grid during problem solution and only in those space areas where the fluid rushes, etc.

Methods implemented in Dytran that allow working with mismatched meshes (several smaller elements can be attached to one element face), meshes with non-uniform density and mixed meshes (non-uniform meshes + meshes with non-uniform density) significantly reduce the cost of creating a computational model. In addition, Dytran provides the ability to realize computational cases in one-dimensional formulation for Eulerian problems with spherical symmetry and two-dimensional formulation for problems with axial symmetry.

Dytran uses the latest “coupling” and “clumping” algorithms to simulate contact and impact interaction of structural elements, including Fluid Structure Interaction (FSI).

General Coupling is the main method of fluid-structure interaction. Its modification Fast Coupling, taking into account peculiarities of the method, can be much more effective.

Arbitrary Lagrange Euler (ALE) Coupling is another available method that allows taking into account not only motion and deformations in the Lagrangian and Eulerian parts of the model, but also motions of the Eulerian mesh itself. This opens up new possibilities for modeling FSI interactions.

Automatic Coupling is the most advanced method in the Dytran arsenal. It allows to considerably simplify the process of model preparation, especially where previously it was necessary to create a lot of coupling surfaces, close the openings with mesh sections with permeability properties, etc.

Dytran uses an explicit time integration scheme that does not require matrix decomposition and is therefore particularly effective for solving nonlinear problems in modeling fast-running processes. To solve the problem in the spatial domain, the finite element method (FEM) is used for the Lagrangian part, and the finite volume method (FVM) for the Eulerian part.

Especially for large and very large problems, Dytran supports paralleling the problem across cluster nodes for FSI in Distributed Memory Parallel (DMP) mode. New algorithms for high-performance FSI computation in DMP mode require no additional licensing. The wide range of tasks to be solved allows Dytran to be used in many industries.

You can request a trial version of the full KISSsoft package for testing. The trial is followed with a technical demonstration aimed on software abilities and focused on your design and manufacturing purposes.

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