Explore topic-wise MCQs in Computational Fluid Dynamics.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Computational Fluid Dynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the relation between the E of the E-factor relaxation and the relaxation factor λ?

A. E=\(\frac{1}{1-\lambda}\)
B. E=\(\frac{\lambda}{1-\lambda}\)
C. E=\(\frac{\lambda}{1+\lambda}\)
D. E=\(\frac{1}{1+\lambda}\)
Answer» B. E=\(\frac{\lambda}{1-\lambda}\)
Discussion
2.

The time-step advancement of the E-factor relaxation is dependent on ___________

A. the convergence
B. the stability
C. the accuracy
D. the cell volume
Answer» E.
Discussion
3.

Which of these statements about the Patankar’s under-relaxation is true?

A. The value form the previous iteration is modified
B. The diagonal coefficients are modified
C. The whole equation is modified
D. The neighbouring coefficient is modified
Answer» C. The whole equation is modified
Discussion
4.

Which of these relaxation techniques is used in the SIMPLE algorithm?

A. Explicit over-relaxation
B. Implicit over-relaxation
C. Explicit under-relaxation
D. Implicit under-relaxation
Answer» D. Implicit under-relaxation
Discussion
5.

What is the disadvantage of over-relaxation?

A. Stability is decreased
B. Divergence is increased
C. Oscillations are increased
D. Convergence is increased
Answer» B. Divergence is increased
Discussion
6.

There is no relaxation when the relaxation factor is __________

A. positive infinity
B. negative infinity
C. one
D. zero
Answer» E.
Discussion
7.

When the relaxation factor is less than one, which of these will occur?

A. Increase the speed of convergence
B. Slow down the speed of convergence
C. Decrease the stability
D. Increase the divergence
Answer» C. Decrease the stability
Discussion
8.

The explicit under-relaxation method means that __________

A. the changes are made before each iteration
B. the changes are made before the iteration process
C. the changes are made after the iteration process
D. the changes are made after each iteration
Answer» D. the changes are made after each iteration
Discussion
9.

The relaxation techniques slow down the __________

A. whole iterative process
B. effect of the sources
C. effect of the neighbouring elements and the source terms
D. effect of the neighbouring elements
Answer» D. effect of the neighbouring elements
Discussion
10.

Relaxation techniques are used to ensure __________

A. convergence
B. stability
C. accuracy
D. boundedness
Answer» B. stability
Discussion