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Tuesday, 16 June 2015

Computational fluid dynamics -Model question paper for B.E/B.Tech Engineering



1(a) Mention some advantages of Computational fluid dynamics. (5 Marks)
(b) Explain the use of Computational fluid dynamics in automotive engineering. (5 Marks)
(c) What details can Computational fluid dynamics capture in the simulation of hydro-cyclones, a process commonly used in the minerals industry? (6 Marks)
(d) What competitive edge can Computational fluid dynamics give to a cycling team? (4 Marks)
2 (a) How are commercial codes allowing Computational fluid dynamics analyses to be carried out with ease for the novice user? (5 Marks)
(b) What are the advantages of using X-Y plots? Give examples of what Computational fluid dynamics results X-Y plots can capture. (6 Marks)
(c) What type of boundary can be used for a computational boundary that represents an open physical boundary? (4 Marks)
(d) What is the meaning of a streamline? What advantages do they have over other plot types? (5 Marks)
3 (a) Obtain the general analytical solution for Laplace’s equation for a one-dimensional case. (8 Marks)
(b) The Reynolds number is a ratio of two fluid properties. What are they? (4 Marks)
(c) The use of direct numerical simulation-DNS remains a problem for engineering applications. Why? (4 Marks)
(d) What is the significance of the Prandtl number equaling to one in terms of entry lengths. (4 Marks)
4 (a) What is the Gaussian elimination method based on? Can this method be used to solve a system of nonlinear algebraic equations? (6 Marks)
(b) Where are the flow-field variables located in collocated grids? How is this different from the locations in a staggered grid? (6 Marks)
(c) What is the significance of integration of the governing equations over a control volume during the finite-volume discretization? (4 Marks)
(d) Why are higher order upwind schemes more favorable than the first order upwind scheme? (4 Marks)
5(a) What is the stability criteria produced by the Von Neumann analysis? (4 Marks)
(b) Discuss briefly how multigrid methods are employed to increase the computational efficiency in solving Computational fluid dynamics problems. (5 Marks)
(c) How is the concept of residual applied to describe the discretized equation of the system of transport equations? (5 Marks)
(d) What are discretization errors? What is the difference between a global error and a local error? (6 Marks)
6(a) What are the some of the difficulties that arise regarding programming of Computational fluid dynamics problems for an unstructured mesh? (6 Marks)
(b) What is the skewness of a mesh element? Why is it best to avoid highly skewed elements? (6 Marks)
(c)  Without experimental data for turbulent inlet profiles, what is the recommended method to consider turbulence effects? (4 Marks)
(d) Why do engineers prefer the Reynolds-averaged-based turbulence models such as the k-ε model over the complex LES model? (4 Marks)
7(a) What is the Eulerian description of a fluid motion? How dioes it differ from the Lagrangian description? (6 Marks)
(b) Explain how Computational fluid dynamics deal with heat transfer coupled with fluid flow. (8 Marks)
(c)  Computational fluid dynamics is well suited to analyze a wide range of shape options. Explain. (6 Marks)
8(a) What advanced techniques would be required to simulate airflow through the respiratory system into the lungs? What about pulsating blood flow through veins and arteries? (6 Marks)
(b) What is the immerse boundary method and how is this different from using a boundary fitted grid? (6 Marks)
(c) What is the difference in one-way coupling and two-way coupling in multiphase flows? (4 Marks)
(d) What difficulties arise from modeling a transient supersonic flow around an airfoil? (4 Marks)

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