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Computational Fluid Dynamics
Computational Fluid Dynamics Objective
Quiz 1
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Q.1
Usually, in the inlet boundary conditions ___________ are known.
a) gradients of flow properties
b) diffusive fluxes of properties
c) convective fluxes of properties
d) flow properties
Q.2
The convective fluxes in the inlet boundary layer _________
a) are specified
b) can be calculated
c) should be approximated
d) are not necessary
Q.3
The diffusive fluxes in the inlet boundary conditions _________
a) are specified
b) can be calculated
c) are not necessary
d) should be approximated
Q.4
An extra grid is used before the physical boundary. What is the use of this grid?
a) To store the inlet boundary values
b) To solve the discretized equation
c) To calculate the inlet boundary values
d) To solve the system analytically
Q.5
_________ is fixed at one inlet node and pressure correction is set to _________ in that node.
a) Gauge pressure, one
b) Absolute pressure, one
c) Gauge pressure, zero
d) Absolute pressure, zero
Q.6
If we are solving a k-ε model, the values of k and ε _________
a) are either specified or estimated at the inlet
b) are either specified or estimated at the outlet
c) need not be specified or estimated anywhere
d) are not estimated
Q.7
Which of these is the best practice regarding outlet boundaries?
a) Outlet boundaries should be at the exact outlet of the geometry
b) Outlet boundaries should be set as close as possible to the inlet boundaries
c) Outlet boundaries should be set as far as possible to the physical geometry
d) Outlet boundaries should be set as close as possible to the physical geometry
Q.8
Which of these statements is false regarding the pressure correction at boundaries?
a) Pressure reference is set at the inlet boundaries
b) Pressure reference is set at the outlet boundaries
c) The link to the inlet boundary side is suppressed
d) The link to the outlet boundary side is suppressed
Q.9
The mass flux out should be equal to the mass flux in. This is in accordance with _________
a) energy conservation
b) momentum conservation
c) continuity condition
d) flux conservation
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