# Computational Fluid Dynamics Questions and Answers – Simple CFD Techniques – CFD Softwares

This set of Computational Fluid Dynamics Multiple Choice Questions & Answers (MCQs) focuses on “Simple CFD Techniques – CFD Softwares”.

1. Which one is a post-processing Software?
a) FieldView
b) CFD GEOM
c) CCM++
d) Typhon

Explanation: FieldView is a CFD post-processing software. FieldView is a data handling and visualizing tool that can be used for CFD post-processing.

2. Which of these plots are irrelevant to CFD post-processing?
a) Contour plots
b) Vector plots
c) xy plots
d) Bar plots

Explanation: Contour plots give a global view of the variation in flow properties. xy plots show the variation of a flow property with respect to an independent variable. Vector plots display vector quantities at discrete grid points. Bar plots cannot be used in CFD.

3. Is adaptive meshing possible in current CFD packages? If yes, which software offers it?
a) No
b) Yes, ANSYS Fluent 12.0
c) Yes, PHOENICS
d) Yes, ANSYS 8.0

Explanation: Adaptive meshing allows to change or refine mesh during the solution of the problem. This was not possible in earlier versions. From ANSYS Fluent 12.0, we get adaptive meshing.

4. The following plot represents flow velocity. Which of these points has the highest acceleration?

a) 1
b) 2
c) 3
d) 4

Explanation: High acceleration means highly varying velocity. In a contour plot, the points with high gradient are represented by close lines. Point 2 has lines very close to each other. Therefore, point 2 has the highest acceleration.

5. Which one is an open source CFD solver tool?
a) OpenFOAM
b) ANSYS Fluent
c) TGrid
d) ParaView

Explanation: OpenFOAM is an open source CFD toolbox based on C++. It allows us to develop customized solvers. Some of the other open source software are CFL3D, Typhon, OVERFLOW, and Wind-US. ANSYS fluent is licensed software. TGrid and ParaView are for pre-processing and post-processing respectively.
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6. Which of the following properties will need a plot like this?

a) Pressure
b) Temperature
c) Velocity
d) Lift

Explanation: The given plot is a vector plot. Velocity is the directional flow property of a fluid. To represent its direction and magnitude, we can use the vector plot.

7. When was the first commercial CFD package released?
a) 1991
b) 1983
c) 1985
d) 1981

Explanation: PHOENICS is the first commercial CFD package released in the year 1981. This can simulate fluid flow, heat and mass transfer, chemical reactions, combustion, etc.

8. Full form of FOAM in OpenFOAM?
a) Field Optimization and Manipulation
b) Flow Optimization and Manipulation
c) Field Operation and Manipulation
d) Flow Operation and Manipulation

Explanation: OpenFOAM stands for open-source Field Operation and Manipulation. It was originally named as FOAM when created by Henry Weller in the late 1980s.

9. Which plot will you choose if you want your users to read quantitative data from your data visualization?
a) Contour plot
b) Vector plot
c) xy plot
d) Mesh plot

Explanation: xy plot shows the quantitative variation of a dependent variable with some independent variable. So, a user can use it readily to get quantitative data at a particular point.

10. Which is a pre-processing software?
a) ANSYS ICEM CFD
b) ANSYS Mechanical
c) ANSYS CFX
d) EnSight

Explanation: ICEM stands for Integrated Computer Engineering and Manufacturing. This is a software that allows us to create models and mesh it for generating grids.

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