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Software Cradle Releases SC/Tetra V8
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Software Cradle Co., Ltd. (hereinafter Cradle)
announces the release of SC/Tetra V8. SC/Tetra V8 is general purpose,
unstructured grid thermal fluid analysis software. V8
contains many new features in the pre-processor, solver, and post-processor;
however, the most significant new features increase software functionality.
New Analytical Functions
Volume of Fluid (VOF) Method.
Simulating free surfaces in fluid dynamics usually requires expensive, high end CFD
software. Cradle has developed a new numerical scheme
for unstructured grid VOF that does not strictly rely on evaluating mass fluxes
through cell interfaces. Version 8 uses a Lagrangian remap approach that
focuses on evaluating the transported volume of fluid. The volume of fluid
transported into a cell results in a volume of fluid occupied in a Lagrangian
prototype overlapped into neighbor cells. This approach is stable and
robust even on arbitrary meshes. Moreover, it can evaluate transported
volume without errors even through discontinuous boundaries as long as there are
no gaps at the boundaries. The unstructured grid VOF method can be applied to
incompressible two-phase flows.
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Six Degree of Freedom Dynamical ALE
(Arbitrary Lagrangian Eulerian).
Traditionally, ALE has been used to simulate active motion of an object such
as rotation of fans, pumps, and turbines, translation of valves and
pistons or combinations of both. In SC/Tetra V8 ALE can now be used to
simulate passive or induced motion of an object in all directions (six degree of
freedom motion) due to fluid dynamic forces acting on the object
Applications include windmills, water turbines, a fishing weight, an object
floating in air or water, or an object floating on water.
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Enhanced Particle Tracking Function.
This feature is used to simulate spray pattern shapes emanating from spray
nozzles (drops and mists). The purpose of this function is to simulate particle
break-up and coalescence. Two different droplet break-up models can be used:
Taylor Analogy Breakup model based on an analogy between an oscillating and
distorting droplet and a spring-mass system, or the Wave Breakup model based on
unstable growth analysis of surface waves for a gas-liquid surface.
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Enhanced Pre-processor Functionality
Fluid Bearing Designer. The SC/Tetra V8 pre-processor offers the
option of a fluid bearing designer wizard. Fluid bearings are widely used for
high speed, high load rotating machinery such as HDD motors. Fluid Bearing
Designer performs mesh generation and sets the boundary conditions for a fluid
bearing analysis. It is equipped with a special Graphical User Interface
(GUI) that enables creation of a new design and mesh along with the necessary
boundary conditions by specifying the parameters requested by the GUI.
 
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Automatic Rearrangement of Octant.
This function automatically arranges fine and coarse octants. Its purpose is to
simplify octant arrangement. Octants are refined based on the narrowness of
geometrical passages or because significant physical phenomena occurs in a
particular region. The degree of refinement can be adjusted to maintain a
target number of elements.
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Improved Prism Layer Insertion.
This function is used to gradate the number of prism layer elements near the
boundaries. It can be used where severe shape conditions occur. The method
inserts prism layer elements in a stair pattern.
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It is also able to smooth regions that
contain a different number of prism layers.
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Improvements in Precision/Speed
Enhanced
Overset Mesh Function. This enhancement enables use of parallel computing to
substantially reduce computation times for overset mesh computations. The
overset mesh uses overlapping meshes to eliminate mesh stretching and shrinking
for moving meshes. This enhancement also enables analysis of moving meshes for
compressible flows and is directly applicable for analyzing cavitation in
rotating turbo machinery.
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These examples represent just some of the enhanced features
of SC/Tetra V8. Other new enhancements include:
Preprocessor
- Improved wrapping function with Edge
conservation
- Conservation of surface region and Gap detection
- Geometry auto-cleaning function
- Enhanced swept elements generator
- Parallel processing for mesh generation
Solver
- Fan model with swirling effects
- Addition of Spalart-Allmaras turbulence model
- Output heat balance between regions for convection,
radiation and conduction
(VF method only)
- Improved periodic boundary conditions
- Improved time step control for thermoregulation
model
- Partitioning large scale models over 250M elements
Postprocessor
- Improved OpenGL emulation
- FLD file interpolation
- FLD file trimming
- Direct output of AVI file
- Viewpoint tracking for moving objects
- Extended variable: Age of flow
For more information about SC/Tetra V8,
please contact Software Cradle.
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