Friday, November 13, 2009

Aerodynamics aerospace interview question and answers

Yesterday I asked you 12 questions that you can face in an aerospace
interview. Today I am giving answers to those.

If you haven't read the questions read the previous post.

Aerodynamics is a branch of fluid dynamics concerned with the study of
gas flows.

The solution of an aerodynamic problem normally involves calculating
for various properties of the flow, such as velocity, pressure,
density, and temperature, as a function of space and time.

Understanding the flow pattern makes it possible to calculate or
approximate the forces and moments acting on bodies in the flow.

Two ways of aerodynamics are an experimental one, using wind tunnel
etc. and the numerical one, using Computational Fluid Dynamics (CFD)

It is the science of predicting fluid flow, heat and mass transfer,
chemical reactions, and related phenomena by solving numerically the
set of governing mathematical equations. A discretization of the
spatial domain into small cells to form a volume mesh is needed, and
then a suitable algorithm is applied to solve the equations of motion.

The results of CFD analysis are relevant in conceptual studies of new
designs and detailed product development as well as troubleshooting
and redesign. It complements testing and experimentation of a new
design, reducing the total effort required in the experiment design
and data acquisition.

Aerodynamic problems can be classified in a number of ways.
1. Based on the flow environment
External/ Internal aerodynamics

2. Based on the ratio of the problem's characteristic flow speed to
the speed of sound
3. Based on viscosity in the flow
Viscous/ Non viscous flow

External aerodynamics is the study of flow around solid objects of
various shapes, for example the study of a wing profile, whereas
internal aerodynamics is the study of flow through passages in solid
objects, for example the study of the internal flow of a wind tunnel,
especially of the boundary layers near its walls

Navier-Stokes equations are named after Claude-Louis Navier and George
Gabriel Stokes!!

Navier-Stokes equations are a set of equations that establish that
changes in momentum of the particles of a fluid are simply the product
of changes in pressure and dissipative viscous forces acting inside
the fluid. These viscous forces originate in molecular interactions
and dictate how viscous a fluid is. Thus, the Navier-Stokes equations
are a dynamical statement of the balance of forces acting at any given
region of the fluid.

Navier-Stokes equations are one of the most useful sets of equations
because they describe the physics of a large number of phenomena like
ocean currents, water flow in a pipe, flow around an airfoil, etc.

My question answer is just a preview of what one will face in an
interview. Hope this helps you to be better prepared for all aerospace

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