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117

Created on October 30, 2022 By

Dr. Sharad Pachpute

Basic of CFD and Fluid Mechanics -QUIZ

Basic of CFD and Fluid Mechanics will be examined

1 / 20

Which of these terms represents the inertia term in the momentum equation

∇.(ρuV)

∇.(uV)

∇.(ρV )

∇.(uV)

2 / 20

Which of the following is the source term in the momentum equation for natural convection

Pressure gradient

Buoyancy

Viscous Stress

Inertia

3 / 20

The staggered grid is useful to overcome

Coupling of Pressure (scalar) and Velocities (vector)

Decoupling of Pressure (scalar) and Velocities (vector)

Interpolation between cells

Alternative coupling

4 / 20

The outflow boundary condition is used in the CFD domain for the boundary

Near the Inlet

Away from Outlet

Zero gradient for all variables

Zero gradient for all variables except pressure

5 / 20

The continuity equations for incompressible flow (divergence of velocity vector,V)

∇.V

∇V

∇×V

∇.∇V

6 / 20

Which is essential CFD input to carry out simulation

Governing Equations

Boundary Condition

Experimental Data

Numerical Scheme

7 / 20

In CFD modeling, what are the two major types of numerical boundary conditions?

Dirichlet and Neumann

Inlet and outlet

Fixed Wall

Symmetry

8 / 20

In the first order Updwind scheme, which variation is considered?

Linear

Quadratic

Parabolic

Hyperbolic

9 / 20

How many variables of Boundary conditions are to be specified for 2D flow?

One

Two

Three

Four

10 / 20

To simulate any laminar flow with any geometry, which of the following equations are solved

Instantaneous Navier-Stokes equations

Equations for homogenous flow

Momentum Equation

Filtered Equations

11 / 20

For incompressible flow, dependent variables in the Navier-Stokes equations are

u, v, w

u, v, w, P, ρ

x, y, z, t

12 / 20

For numerical simulations, what are the independent variables in the Navier-Stokes equations after discretization?

x, y, z, ρ

x, y, z, t, ρ

x, y, z, t

x, y, z

13 / 20

The momentum equation is based on

Mass conservation

First Law of Thermodynamics

Newtons Second Law of Motion

Kinetics

14 / 20

A control volume-based model results in which equation?

Differential

Integral

Linear

Conservative

15 / 20

In post-processing of CFD results, which plots are irrelevant?

Contour Plot

X-Y Plot

Vector Plot

Bar Plot

16 / 20

The continuity equation is derived based on

Energy conservation

Zeroth Law thermodynamics

First Law of Thermodynamics

Mass conservation

17 / 20

For the implicit method, which is the essential step?

Linearizing the Partial differential equation

Linearizing the difference equation

Normalizing the Partial differential equation

High order Differentiation

18 / 20

Which of the following does not come under the three main elements of CFD modeling?

Process calculation

Pre-processing

Post-processing

Simulation

19 / 20

The region of interest for CFD analysis is carried is called

Mesh Density

Grid Size

Computational Domain

Area

20 / 20

CFD is the third pillar for numerical fluid flow analysis. What are the other two traditional approaches?

Analytical and Physical

Theoretical and experimental

Numerical and Pseudo method

Experimental and Statistics

Your score is

The average score is 58%

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Created on January 24, 2023 By

Dr. Sharad Pachpute

Online Quiz on Heat Transfer

Fundamental questions on Heat Transfer and its numerical modeling are given in this quiz

Email to get the Gift of the PDF booklet: cfdflowengineering@gmail.com

if you score > 80%:

1 / 21

Which of the following methods is not used to discretize the Radiative Transport Equation for combustion

Discrete Transfer Radiation Method

P1- Radiation Model

Discrete Radiation Model

Surface Radiation Model

2 / 21

The radiative Heat transport equation is numerically solved for

Surface Temperature

Absorbing and scattering Gas Medium

Absorbing and scattering Surfaces

Medium Thermal Properties

3 / 21

Radiation heat transfer is determined by which law

Kirchhoff's law

Newtons Law of Cooling

Thermodynamic laws

Mass Conservation

4 / 21

The relation between momentum and thermal boundary layer is defined by which of the following parameter

Velocity/Thermal diffusivity

Viscosity of fluid/ Eddy viscosity

Kinematic viscosity /Thermal diffusivity

Turbulent Models

5 / 21

For turbulent heat transfer over a heated plate, the turbulent diffusivity is determined using

Reynolds number for Flat plate Boundary layer

Turbulent viscosity / Prandtl's Number

Eddy viscosity/Laminar viscosity

Mean Velocity Gradient

Mean Temperature Gradient

6 / 21

Heat transfer coefficient in CFD simulation is calculated using

Nusselt Number Correlation

Reynolds and Prandtl's Number

Energy balance to First Stationary Fluid Layer adjacent to wall

Temperature gradient in thermal boundary layer

7 / 21

what is the unit of heat transfer coefficient?

W/m2-k

W/m-k

W/m2

W/k4

8 / 21

For constant air properties, the forced convective heat transfer rate depends on

Inlet Velocity

Reynolds and Prandtl Number

Temperature Gradients

Properties of sold and fluid

9 / 21

Convective heat transfer is calculated by which of the reference temperature

Surrounding Temperature (Ta)

Fluid Temperature (Tf)

Average of Inlet and surrounding

Standard Temperature (Tst)

10 / 21

Thermal conductivity for anisotropic is defined as

Scalar

Vector

Second Order Tensor

Heat Flux Vector

11 / 21

Which of the following Laws is based on convective heat transfer between a surface and adjacent fluid

Newtons Law of Cooling

Fourier's Law

Kirchhoff’s law

First Law of Energy

12 / 21

For the homogenous material, the rate of heat transfer normal to the plane wall is given by which of the following equation?

Q = 2kALx

Q = 2k/L x

Q = kA (T1-T2)/L

Q = 2kAx/ L

13 / 21

The unit heat transfer is given as

Joule

Watt

Pascal

Calorie

14 / 21

which of the following law the heat transfer takes place?

First Law of Thermodynamics

Second Law of Thermodynamics

Newtons Law of Cooling

Kirchhoff's law of Radiation

15 / 21

Which of the following is a method of heat transfer?

Conduction

Convection

Thermal Radiation

All above

16 / 21

In natural convection, the source term due to buoyancy in the energy equation is calculated by

Rayleigh number and Prandtl's Number

Bounssinq hypothesis

Reynolds number and Prandtl's Number

Grashof

17 / 21

which of the following terms is added to compute turbulent convective transfer in RANS equations

Turbulent Heat Diffusion

Turbulent Advection

Unsteady Term

Mean Temperature Gradient

18 / 21

Which of the following radiation models accounts for the effect of flue gas composition on heat transfer

weighted-sum-of-gray-gases (WSGG) model

Discrete Radiation Model

P1- Model

Surface Radiation Model

19 / 21

In natural convection, the coefficient of expansion of fluid (β) for an ideal gas is calculated as

∆P/∆x

∆ρ/∆Tρ

∆P/∆Tρ

1/T

20 / 21

To compute the convective heat transfer from the heating surface which numerical scheme is used

Central scheme

SIMPLE

Upwind

PRESTO!

21 / 21

To compute the view factor for radiative heat transfer, which radiation model is used in CFD solver

Discrete Radiation Model

P1-Model

DTRM Model

Surface Radiation

Your score is

The average score is 55%

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