Download PTU B.Tech 2020 March Aero 6th Sem ASPE 309 Computational Fluid Dynamics Question Paper

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Roll No. [T T TTT T[] [ ] Total No. of Pages : 03

Total No. of Questions : 09

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B.Tech.(Aerospace Engg.) (2012 Onwards) (Sem.-6)

COMPUTATIONAL FLUID DYNAMICS

Subject Code : ASPE-309

M.Code : 72454

Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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Q1 Answer briefly :

1. Parallel computing
2. Finite element method.
3. Serial Computing
4. Viscous flow

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5. Flux variables
6. Time accurate-solution
7. Stretched Grid
8. Boundary fitted Grid
9. Explicit solution

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10. Contour plot

SECTION-B

Q2 Explain the physical significance of various terms in the Euler’s equation (Momentum Equation) given below :

?(?u)/?t +?.(?uV)= -?p/?x + f_x
?(?v)/?t +?.(?vV)= -?p/?y + f_y

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Q3 Show that the Laplace’s equation given below is an elliptic equation :

?²/?x² + ?²/?y² = 0

Q4 Explain two of the computer graphic techniques used in cfd.

Q5 Explain Crank-Nicolson’s method for Implicit solution techniques.

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Q6 The generic form of the system of governing equations is given below. Explain space marching and time marching for the solution of these equations.

?U/?t + ?F/?x + ?G/?y + ?H/?z = 0

SECTION-C

Q7 One dimensional heat conduction equation with constant thermal diffusivity is given below :

?T/?t = a ?²T/?x²

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Obtain difference equation and explain explicit time marching approach for solution of the one dimensional heat conduction equation.

Q8 The Lax-Wendroff technique is explicit, finite-difference method particularly suited to marching solutions. Consider the Euler’s Equation.

?/?t + u ?/?x + v ?/?y + ? ?u/?x + ? ?v/?y = 0
?u/?t + u ?u/?x + v ?u/?y + (1/?) ?p/?x = 0
?v/?t + u ?v/?x + v ?v/?y + (1/?) ?p/?y = 0

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Set up a numerical solution of Euler’s equation using Lax-Wendroff Technique.

Q9 Write short notes on the following :

1. Eigen value method for classifications of governing partial differential equations.
2. General transformation of the governing equations from physical space to computational space.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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