CCARAT (Computer Aided Research Analysis Tool)
CCARAT is a research finite element program designed to solve
a large range of problems in Computational Fluid and Solid
Mechanics: e.g. multifield, multiscale and multidiscretisation
schemes, shape and topology optimization problems and material
modelling and element technology aspects. It is developed
and maintained at the Institute of Structural Mechanics (IBS),
University of Stuttgart and the Chair of Numerical Mechanics
(LNM), Technical University of Munich. Various types of sophisticated
structural elements (e.g. shell, brick and beam) and GLS stabilised
fluid elements in 2d and 3d on a moving mesh (ALE formulation)
are included in the code.
For the linear system of equations several external solvers
(e.g. AZTEC, SPOOLES, UMFPACK and TRILINOS) as well as an
in-house parallel semi-algebraic multilevel scheme based on
the aggregation concept are available.
Fluid Structure Interaction
The considered class of Fluid Structure interaction applications
falls under the category of transient interaction of incompressible
viscous flows and nonlinear flexible structures. Partitioned
analysis techniques enjoy more popularity than the fully coupled
monolithic approaches, as they allow the independent use of
suitable discretization methods for physically and/or dynamically
different partitions. In this approach a non-overlapping partitioning
is employed, where the physical fields (fluid and structure)
are coupled at the interface, i.e the wetted structural surface.
A third computational field, the deforming fluid mesh, is
introduced through an Arbitrary Lagrangean-Eulerian description.
Each individual field is solved by semi-discretization strategies
with finite elements and implicit time stepping algorithms.
The iterative substructuring schemes used are accelerated
either analoque to a gradient method (method of steepest descent)
or via an Aitken method.
Typical applications can be found in biomechanics, blood
flow and aeroelasticity of structures like bridges and membrane
Prof. Dr.-Ing. E. Ramm / Prof. Dr.-Ing. habil. Manfred Bischoff / Malte von Scheven
Institut für Baustatik und Baudynamik
Prof. Dr.-Ing. W.A. Wall / Ulrich Kuettler
Lehrstuhl für Numerische Mechanik
Technische Universität München
Sunil Reddy Tiyyagura