Engineering Questions with Answers - Multiple Choice Questions
MCQs on Flow over Sphere
1 - Question
Is uniform flow around a sphere is obtained?
a) True
b) False
View Answer
Explanation: Numerical solutions of the transient uniform flow around a sphere are obtained. The transition takes place between an initial potential flow and a fully developed viscous field. The fluid is incompressible and homogeneous around the sphere.
2 - Question
Is flow around the sphere is incompressible and homogeneous?
a) False
b) True
View Answer
Explanation: The fluid is incompressible, homogeneous and its flow is governed by the complete more naive stokes equations. The range of Reynold number studied id 1-1000, where a recirculatory wake appears and the nonlinear terms are essential.
3 - Question
Is recirculatory wake appears at Re 1-1000?
a) False
b) True
View Answer
Explanation: The range of Reynolds number studied at Re 1-1000 .where a recirculatory wake appears and the nonlinear terms are essential, that is they cannot be neglected or approximated. The flow is assumed to be axisymmetric through this range.
4 - Question
Is flow is assumed to be axisymmetric?
a) True
b) False
View Answer
Explanation: The flow is assumed to be axisymmetric throughout this range. A timed pent stream function vorticity formulation is adopted. The solution is obtained by constructing a finite difference approximation to the vorticity transport equation on an expanding spherical polar grid system.
5 - Question
Is vorticity transport is obtained by constructing a finite difference approximation?
a) True
b) False
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Explanation: The is obtained by constructing a finite difference approximation to the vorticity transport equation on an expanding spherical polar grid system. Central difference of second order accuracy both in time and space is utilized.
6 - Question
Is second order accuracy occurs at a time?
a) True
b) False
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Explanation: Central differencing of second order accuracy both in time and space is utilized. Experiments with numerical stability show an appreciable deviation from linearized stabi
7 - Question
Is large gradients of vorticity is applied at linearized stability?
a) True
b) False
View Answer
Explanation: The linearized stability analysis due to the large gradients of vorticity in the field. Quantitative physical results are obtained. The geometrical parameters characterizing the recirculatory wake compare favorably with those recorded in physical experiments.
8 - Question
Is flow field around a sphere is uniform?
a) True
b) False
View Answer
Explanation: The flow field around a sphere in a uniform flow has been analyzed numerically for conditions corresponding to the subcritical and supercritical regimes spanning a wide range of Reynolds number particular attention has been devoted to assessing predictions.
9 - Question
Is skin friction drag is formed due to pressure distribution?
a) True
b) False
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Explanation: The pressure distribution, skin friction, and drag as well as to understanding the changes in the wake organization and vortex dynamics with the Reynolds number. The unsteady turbulent flow is computed using detached eddy simulation.
10 - Question
Is large eddy simulation will occur for both subcritical and supercritical solution?
a) True
b) False
View Answer
Explanation: The large eddy simulation in the regions away from solid surfaces. For both the subcritical and supercritical solutions, the agreement with experimental measurements for the mean drag and pressure distribution over the sphere is adequate.