[request_ebook] applied computational fluid dynamics techniques

Description

1 INTRODUCTION AND GENERAL
CONSIDERATIONS
Before going into a detailed description of applied Computational Fluid Dynamics (CFD)
techniques, it seems proper to define its place among related disciplines. CFD is part of
computational mechanics, which in turn is part of simulation techniques. Simulation is
used by engineers and physicists to forecast or reconstruct the behaviour of an engineering
product or physical situation under assumed or measured boundary conditions (geometry,
initial states, loads, etc.). A variety of reasons can be cited for the increased importance that
simulation techniques have achieved in recent years.
(a) The need to forecast performance. The inability to forecast accurately the performance of a
new product can have a devastating effect on companies. The worst nightmare of an aircraft or
car manufacturer is to build a prototype which has some hidden flaw that renders it inoperable
or seriously degrades market appeal. Of the many examples that could be cited here, we just
mention flutter or buzz for aircraft and unforeseen noise or vibrations for cars. With the
development costs for new products being so large (about $4 × 109 for a new aircraft, $109
for a new car; these and all subsequent quotations are in US$ and are accurate in the year
2000), a non-performing product can quickly lead to bankruptcy. The only way to minimize
the risk of unexpected performance is through insight, i.e. information. Simulation techniques
such as CFD can provide this information.
(b) Cost of experiments. Experiments, the only other alternative to simulations, are costly.
A day in a large transonic windtunnel costs about $105, not counting the personnel costs
of planning, preparing the model, analysing the results, etc., as well as the hidden costs of
waiting for availability and lost design time. An underground test for a nuclear device costs
about $108, and for a conventional weapon $107. Other large experiments in physics can also
command very high prices.
(c) Impossibility of experiments. In some instances, experiments are impossible to conduct.
Examples are solar and galactic events, atmospheric nuclear explosions (banned after the Test
Ban Treaty of 1963), or biomedical situations that would endanger the patient’s life.

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