Though the applicability of the realizable k-ε model and the RNG k-ε model are almost the same, the realizable k-ε model is ___________ when compared to the RNG k-ε model.

more accurate and converges easily

Which of these conditions satisfy realizability?

\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)

\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)>1

\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)>0

\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)

The non-linear k-ε models relate the Reynolds stresses to _________

the cubic vector products of strain rate and vorticity

the quadratic vector products of strain rate and vorticity

the cubic tensor products of strain rate and vorticity

the quadratic tensor products of strain rate and vorticity

The realizable k-ε model is based on ________

the turbulence model replacing the realizability constraint

the viscoelastic analogy replacing the realizability constraint

the realizability constraint with viscoelastic analogy

the realizability constraint without viscoelastic analogy

The realizable k-ε model falls into which of these categories?

Linear two-equation turbulence models

Non-linear two-equation turbulence models

Linear two-equation turbulence models

Non-linear three-equation turbulence models

Linear two-equation turbulence models

Which of these conditions define realizability?

Non-linear k and ε transport equations

Linear k and ε transport equations

Non-linear k and ε transport equations

Explore topic-wise MCQs in Computational Fluid Dynamics.

This section includes 9 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.	Which of these conditions should be satisfied for a model to be realizable?
A.	Bessel’s inequality
B.	Cauchy-Schwarz inequality
C.	Holder’s inequality
D.	Jensen’s inequality
Answer» C. Holder’s inequality

Discussion

2.	Though the applicability of the realizable k-ε model and the RNG k-ε model are almost the same, the realizable k-ε model is ___________ when compared to the RNG k-ε model.
A.	more accurate and converges easily
B.	more stable
C.	linear
D.	more consistent
Answer» B. more stable

Discussion

3.	The realizable k-ε model is best for predicting __________
A.	mixing layers
B.	wake formation
C.	spreading of jets
D.	smooth boundary layer flows
Answer» D. smooth boundary layer flows

Discussion

4.	Which of these conditions satisfy realizability?
A.	\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)<1
B.	\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)>1
C.	\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)>0
D.	\(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)<0
Answer» E.

Discussion

5.	Which of these equations gives the turbulent dynamic viscosity used in the realizable k-ε model?
A.	μt ∝ ρk/ε
B.	μt ∝ k / ε
C.	μt ∝ ρk2/ε
D.	μt ∝ k2ε
Answer» D. μt ∝ k2ε

Discussion

6.	The non-linear k-ε models relate the Reynolds stresses to _________
A.	the cubic vector products of strain rate and vorticity
B.	the quadratic vector products of strain rate and vorticity
C.	the cubic tensor products of strain rate and vorticity
D.	the quadratic tensor products of strain rate and vorticity
Answer» E.

Discussion

7.	The realizable k-ε model is based on ________
A.	the turbulence model replacing the realizability constraint
B.	the viscoelastic analogy replacing the realizability constraint
C.	the realizability constraint with viscoelastic analogy
D.	the realizability constraint without viscoelastic analogy
Answer» E.

Discussion

8.	The realizable k-ε model falls into which of these categories?
A.	Non-linear two-equation turbulence models
B.	Linear two-equation turbulence models
C.	Non-linear three-equation turbulence models
D.	Linear two-equation turbulence models
Answer» B. Linear two-equation turbulence models

Discussion

9.	Which of these conditions define realizability?
A.	Negative k and ε values
B.	Linear k and ε transport equations
C.	Non-negative k and ε values
D.	Non-linear k and ε transport equations
Answer» D. Non-linear k and ε transport equations

Discussion

Explore topic-wise MCQs in Computational Fluid Dynamics.

Which of these conditions should be satisfied for a model to be realizable?

Though the applicability of the realizable k-ε model and the RNG k-ε model are almost the same, the realizable k-ε model is ___________ when compared to the RNG k-ε model.

The realizable k-ε model is best for predicting __________

Which of these conditions satisfy realizability?

Which of these equations gives the turbulent dynamic viscosity used in the realizable k-ε model?

The non-linear k-ε models relate the Reynolds stresses to _________

The realizable k-ε model is based on ________

The realizable k-ε model falls into which of these categories?

Which of these conditions define realizability?