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Computational Fluid Dynamics
Computational Fluid Dynamics Multiple Choice
Quiz 1
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Q.1
LES is preferred when _____________
a) the flow is compressible
b) the flow has a high Reynolds number
c) the flow is turbulent
d) the flow has heat transfers
Q.2
LES uses _____________
a) spatial filtering
b) time averaging
c) ensemble averaging
d) reynolds averaging
Q.3
What does SGS stress stand for?
a) Sub-grid-scale stress
b) Suitable-grid-scale stress
c) Suitable-grey-scale stress
d) Sub-grey-scale stress
Q.4
Which of these will not come under the types of filter functions used by the LES model?
a) Top-hat filter
b) Leonard filter
c) Gaussian filter
d) Spectral cut-off
Q.5
What is the other name of the top-hat filter?
a) Cross filter
b) Cube filter
c) Box filter
d) Square filter
Q.6
Which of these filters is commonly used in FVM models?
a) Gaussian filter
b) Top-hat filter
c) Spectral cut-off filter
d) Gaussian and spectral cut-off filter
Q.7
In FVM methods, cut-off width depends on ____________
a) the PDE
b) the algebraic equation
c) the grid-size
d) the discretization method
Q.8
The cut-off width dependent on the finite volume grid size is equal to _____________
a) the square of the grid cell volume
b) the cube of the grid cell volume
c) the square root of the grid cell volume
d) the cube root of the grid cell volume
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