# Aerodynamics Questions and Answers – Finite Control Volume Approach

This set of Basic Aerodynamics Questions and Answers focuses on “Finite Control Volume Approach”.

1. Which of the following flow is best suited for space shuttle?
a) continuum flow
b) free molecular flow
c) turbulent flow
d) laminar flow

Explanation: The gas molecules in free molecular flow are spaced so widely apart that collisions with the body surface are rare, and the body surface can feel each molecular impact clearly, reducing vibration in the spacecraft.

2. In which of the following does the shock wave form?
a) subsonic flow
b) transonic flow
c) supersonic flow
d) incompressible flow

Explanation: Supersonic flows are defined by the presence of shock waves, which cause the flow characteristics and streamlines to alter abruptly. The gas can be compressed by shock waves in supersonic flow.

3. Which of the following has similar characteristics?
a) solid and liquid
b) liquid and gas
c) solid and gas
d) cannot be determined

Explanation: When a force is applied to a liquid or a gas, the deformation will increase proportionally to the rate of change of deformation. Liquid and gas molecules are also loosely packed. When filled in a container, they take on that container’s shape.

4. Which of the following is a point property?
a) Pressure
b) Mass
c) Density
d) Pressure and density

Explanation: Pressure and density differ from one location to the next. Pressure and density are directly related to each other and fluctuate with altitude. As they move from one location to another, pressure and density are affected by the path. Pressure and density are affected when one parameter is modified.

5. Which of the following is most difficult to analyze?
a) solid
b) plasma
c) fluids
d) cannot be determined

Explanation: Fluid (both liquid and gas) is a “squishy” substance. Because the solid body is geometrically well defined, its motion is simply determined. In contrast, it is difficult to decide how to qualitatively model the motion of a fluid in fluids.

6. Which of the following flow is practically impossible in nature?
a) viscous flow
b) inviscid flow
c) laminar flow
d) turbulent flow

Explanation: It is nearly difficult to flow without friction, thermal conduction, or diffusion. Energy losses occur during any process or flow, resulting in frictional losses, thermal losses, diffusion, and a variety of other losses.

7. By the time the vehicle reaches the surface of the earth, the potential and kinetic energy become zero.
a) True
b) False

Explanation: The vehicle has a large amount of kinetic energy due to its high velocity and a large amount of potential energy due to its altitude during re-entry near the outer edge of the atmosphere, but as it approaches the surface of the earth, it becomes zero because the kinetic and potential energy is used in heating the body and heating the airflow around the body.

8. Continuity equation is one of the most fundamental equations in fluid dynamics.
a) True
b) False

Explanation: The continuity equation connects aerodynamic phenomena over a finite region of space without worrying about the specifics of what’s going on at any given location in the flow.

9. Surface forces includes _________
a) pressure and shear stress
b) point force
c) body force
d) gravity

Explanation: The surface force, like the pressure force and shear stress, works on the entire surface of the body, not only on a point or on the body. Surface forces can affect either the body’s external or internal surfaces.

10. System and surrounding are both inter-related things.
a) True
b) False

Explanation: Energy comes in the form of heat and work. The system and its surroundings lose energy during the transfer of heat and work. The system and its surroundings are separated by a boundary. In the environment, there is a system.

The finite volume method (FVM) is an algebraic equation-based method for describing and evaluating partial differential equations. The divergence theorem is used to convert volume integrals in a partial differential equation that contain a divergence term to surface integrals in the finite volume technique. The gas molecules in free molecular flow are spaced so widely apart that collisions with the body surface are rare, and the body surface can feel each molecular impact clearly, reducing vibration in the spacecraft.