"Closing
the Gap Between CAD Model and CFD Simulation"
Virtually all computer-based design tasks
commence with the use of computer-aided design
(CAD) systems to create detailed geometric
models. These models serve as the point of
departure for diverse analysis tools, such as
computational fluid dynamics (CFD), stress
analysis, and computational electromagnetics,
acoustics and many more. The success of such
downstream applications is, of course,
pre-dictated on the receipt of geometric models
that are accurate, self-consistent, and
economical in data volume.
Although modern CAD systems have attained a
certain degree of maturity, their efficiency,
reliability, and compatibility with subsequent
analysis tools falls far short. At the heart of
this problem lie some deep mathematical issues,
concerned with the computation, representation,
and manipulation of complex geometries.
Meshing algorithms have attained a high degree
of sophistication and reliability, provided they
are furnished with "correct" geometrical input.
The "bad" CAD geometry is always a show-stopper
in terms of blocking the subsequent
grid-generation and flow-solution phase. The
"typical" CFD project data for complex
geometrical configurations like aircraft,
automobile etc. shows more than 30-40% time in
CAD import and repair operations. Of course one
can go with the complex geometry but down the
line, meshing and computational efforts will be
proportional to the complexity of he available
geometry.
One can think of using pre-processing tools for
creating the CAD model. But due to the
limitations of geometrical functionality or
compatibility of the created CAD model for other
domains, the general practice followed in
industry is to use dedicated CAD modeling
software.
This course will focus on all CAD modeling and
repair issues during the CAD to CFD cycle. All
the issues related to different file formats,
data loss, tolerance limits, etc., will be
discussed. The concept of "CAD model for CFD
simulation" will be introduced to the
participants. This course is suitable for those
who are involved in meshing activities requiring
a CAD model created in a dedicated CAD modeling
software. The best precautions can be taken
during CAD modeling itself. So this course is
also suitable for those who are going to create
CAD models for CFD simulation.
After the training you can answer the questions
like:
-
What is a good
model for CFD simulation?
-
What
precautions have to be taken during modeling
in CAD software?
-
Which is the
best file format for pre-processing tools
like ICEM-CFD and GAMBIT?
-
How to extract
the fluid domain for CFD simulation?
-
How detailed
model need to be created for CFD simulation?
-
What are the
typical issues during CAD import-export
operations?
-
How do I repair
the geometry once it is imported in
pre-processing software?
-
How meshing is
affected by bad CAD model?
-
What are the
guidelines I need to give to CAD modeling
engineer so that CAD repair issues will be
reduced?
