Explore topic-wise MCQs in Computational Fluid Dynamics Questions and Answers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Computational Fluid Dynamics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

Consider a model of finite control volume (volume V and surface area) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\).

A. \(\rho\vec{V}.d\vec{S}\) is positive when _____________
B. The mass flow is outward
C. The mass flow is inward
D. The mass flow is positive
E. The mass flow is negative
Answer» B. The mass flow is outward
Discussion
2.

To convert the non-conservative integral equation of mass conservation into the conservative integral form, which of these theorems is used?

A. Stokes theorem
B. Kelvin-Stokes theorem
C. Gauss-Siedel theorem
D. Gauss Divergence Theorem
Answer» E.
Discussion
3.

Consider a model of finite control volume (volume V and surface area) moving along the flow with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the time rate of change of mass inside the control volume?

A. \(\iiint_V\rho dV\)
B. \(\frac{\partial}{\partial t} \iiint_V\rho dV\)
C. \(\frac{D}{Dt} \iiint_V\rho dV\)
D. ρdV
Answer» D. ρdV
Discussion
4.

Consider a model of finite control volume (volume V and surface area) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the mass inside the control volume?

A. \(\iint_s\rho \vec{V}.d\vec{S}\)
B. \(\iiint_V\rho dV\)
C. ρdV
D. \(\frac{\partial}{\partial t} \iiint_V\rho dV\)
Answer» C. ρdV
Discussion
5.

Consider a model of finite control volume (volume V and surface area S) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the net mass flow rate out of the surface area?

A. \(\iint_V\rho \vec{V}.dV\)
B. \(\rho \vec{V}.d \vec{S}\)
C. \(\iiint_V\rho \vec{V}.d\vec{S}\)
D. \(\iint_V\rho \vec{V}.d\vec{S}\)
Answer» E.
Discussion
6.

Which of these models directly gives this equation?

A. \(\frac{∂}{∂t}\iiint_v\rho dV+\iint_s \rho\vec{V}.\vec{dS}=0 \)
B. a)
C. b)
D. c)
E. d)
Answer» C. b)
Discussion