Computational Fluid Dynamics Error Sources Online Exam Quiz
Computational Fluid Dynamics Error Sources GK Quiz. Question and Answers related to Computational Fluid Dynamics Error Sources. MCQ (Multiple Choice Questions with answers about Computational Fluid Dynamics Error Sources
Numerical dispersion error causes __________
Options
A : convergence problems
B : accuracy problems
C : boundedness problems
D : stability problems
Which of these ways can be used to overcome stream-wise numerical diffusion?
Options
A : Decreasing the order of interpolation
B : Increasing the order of interpolation
C : Increasing the number of neighbours considered
D : Decreasing the number of neighbours considered
Numerical dispersion is a result of __________
Options
A : higher-order interpolation profile
B : unphysical behaviour of assumed interpolation profile
C : first-order interpolation profile
D : quadratic interpolation profile
Which of these methods cannot be used to reduce the errors due to cross-stream numerical diffusion?
Options
A : Interpolation in the direction of flow
B : Higher order interpolation profile
C : Multi-dimensional interpolation profiles
D : Changing the direction of interpolation
Which is correct regarding the upwind scheme?
Options
A : Neither numerical dispersion nor numerical diffusion error arises
B : Only numerical diffusion error arises
C : Both numerical dispersion and numerical diffusion errors arise
D : Only numerical dispersion error arises
Which of these is correct for the central difference scheme?
Options
A : Neither numerical dispersion nor numerical diffusion error arises
B : Only numerical diffusion error arises
C : Both numerical dispersion and numerical diffusion errors arise
D : Only numerical dispersion error arises
What is the cause of cross-stream numerical diffusion?
Options
A : One-dimensional nature of the assumed profiles
B : Multi-dimensional nature of the assumed profiles
C : Higher order of accuracy
D : Higher order of interpolation
Numerical diffusion causes __________
Options
A : smearing of sharp gradients
B : oscillations
C : undershoots and overshoots
D : inaccuracy
What is the problem of numerical diffusivity?
Options
A : The simulated model has a higher diffusivity than the actual flow
B : The simulated model has a lower diffusivity than the actual flow
C : The simulated model has a different diffusivity than the actual flow
D : The simulated model has a zero diffusivity
Which of these methods can be used to evaluate the errors in convection-diffusion schemes?
Options
A : Using the exact solution of the source-free problem
B : Using the exact solution of the source and diffusion-free problem
C : Using the exact solution of the diffusion-free problem
D : Using the first-order schemes
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