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© 2006 ANSYS, Inc.
Introduction to the ANSYS software suite
A series of step-by-step tutorials to guide you through ANSYS
DesignModeler and ANSYS CFX
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CFD Background
Computational fluid dynamics involves the simulation of fluid flow
and heat transfer.
The method requires the subdivision of a flowing fluid region into
a series of elements (control volumes)
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Each element contains calculation locations where quantities such
as velocity, pressure, and temperature are determined.
The collection of the calculations provide a description of the
entire flow field.
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Control volumes used to subdivide a three-dimensional rectangular
solid.
Creating the mesh is critical for the attainment of accurate
solutions. It is often impossible to extract meaningful results
from a poor mesh.
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CFD Background
Another critical step in a CFD analysis is the creation of boundary
conditions. Boundary conditions describe characteristics of the
fluid flow at the boundary of the solution domain.
The boundary regions, shown in green, completely encompass the
fluid.
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Software Overview
The ANSYS software has the capability of solving structural,
thermal, E-M, and fluid problems.
Within ANSYS Workbench, CFX is utilized to carry out fluid flow
solutions.
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A working environment that enables the development, preparation and
management of CAE information for finite element analyses as simple
as linear, static simulations or as complex as nonlinear,
transient, dynamic simulations for structural, mechanical,
electrical, electromagnetic, thermal, fluid and biomedical
applications. The following tools are contained within ANSYS
Workbench:
DESIGNMODELER:
A feature-based parametric 2D sketching and 3D modeling tool in
Workbench where imported and/or attached CAD geometry can be
prepared for simulation.
CFX-MESH:
A meshing tool which allows the construction of a CFD mesh on three
dimensional geometries created in DesignModeler. The resulting mesh
file is imported into CFX for analysis.
CFX:
A fully integrated CFD program which allows a user to construct and
solve a fluid flow problem and analyze the results.
ANSYS ICEM CFD:
From CAD to mesh generation for analysis, ANSYS ICEM CFD provides
sophisticated geometry acquisition, mesh generation,
post-processing, and mesh optimization tools. The ICEM mesh
generation tools can parametrically create grids in multiple
formats, including hexahedral, tetrahedral, hybrid, and Cartesian
meshes. ICEM CFD is an alternative to the mesh generation
capability of CFX-Mesh. ICEM CFD will not be featured in the
present tutorial.
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Software Overview - DesignModeler
Within each of the featured programs that are contained within the
ANSYS Workbench suite, generic algorithms may be followed for most
numerical simulations. For CFX-Mesh and CFX, those algorithms are
shown in the following:
CFX-Mesh Algorithm:
Step 1: Import the solid model from ANSYS DesignModeler
Step 2: Create the regions which are related to the physical
boundary conditions
Step 3: Specify the characteristics of the mesh (element size and
layout)
Step 4: Create the surface mesh
Step 5: Create the volume mesh
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Step 1: Import the mesh from CFX-Mesh
Step 2: Select the fluid type from the CFX database or assign the
physical properties of a fluid
Step 3: Specify the region of fluid flow, the physical model and
the boundary conditions
Step 4: Initialize the solution
Step 5: Provide information relating to the numerical solution
procedure
Step 6: Export the files required for simulation to CFX-Solve
II. Solver (CFX-Solve):
Step 1: Carry out the numerical solution until convergence is
achieved
III. Postprocessor (CFX-Post):
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