Computational Fluid Dynamics Mock Test 5

10%

Question 1 of 10

1. Find \(\frac{\partial u}{\partial r}\) at point 1 using forward difference method.

5000

100

500

1000

Question 1 of 10

Question 2 of 10

2. Order of accuracy m means _____________

as the grid size is reduced, the approximations diverge from the exact solution with an error proportional to m times of the grid size

as the grid size is reduced, the approximations converge to the exact solution with an error proportional to m times of the grid size

as the grid size is reduced, the approximations converge to the exact solution with an error proportional to m powers of the grid size

as the grid size is reduced, the approximations diverge from the exact solution with an error proportional to m powers of the grid size

Question 2 of 10

Question 3 of 10

3. The surface area of the face of a 3-D element is a _____________

Scalar

3-D tensor

2-D tensor

Vector

Question 3 of 10

Question 4 of 10

4. To make the spectral method advantageous _____________

Grids should be structured and function must be periodic

Function must be periodic but grids can be non-uniform

Grids should be uniform and function must be periodic

Grids should be uniform but function can be non-periodic

Question 4 of 10

Question 5 of 10

5. Which of these properties limit the time-step size in the explicit schemes?

Convergence

Error

Stability

Consistency

Question 5 of 10

Question 6 of 10

6. To find the value of a flow variable at a third point in between two points with known values, which of these methods can be used for the one-dimensional case?

Taylor series

Interpolation

Fourier series

Shape function

Question 6 of 10

Question 7 of 10

7. Structured grids give ____________ and need ____________

no access to elements, less memory for storage

easy access to elements, more memory for storage

no access to elements, more memory for storage

easy access to elements, less memory for storage

Question 7 of 10

Question 8 of 10

8. Which series expansion is used by the MacCormack’s technique?

Laurent series

Taylor Series

McLaurin series

Fourier series

Question 8 of 10

Question 9 of 10

9. For higher order derivatives, spectral methods ___________

difficult to generate

become invalid

can be easily generated

are not suitable

Question 9 of 10

Question 10 of 10

10. Which of these terms need a surface integral?

Diffusion and rate of change terms

Convection and diffusion terms

Convection and source terms

Diffusion and source terms

Question 10 of 10