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242

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 51%

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119

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

Thermal radiation in biomass 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

Radiative Transport Equation

Surface Temperature

Absorbing and scattering Gas Medium

Absorbing and scattering Surfaces

Medium Thermal Properties

3 / 21

Radiation heat transfer is determined by which law

radiative heat transfer 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

Thermal and momentum boundary layers

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

Thermal Boundary layer

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?

convective Heat transfer formula

W/m2-k

W/m-k

W/m2

W/k4

8 / 21

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

Forced convection heat transfer

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

convective Heat transfer formula

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?

conduction heat Transfer types

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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57

Created on December 04, 2022 By

Dr. Sharad Pachpute

Important Questions on Turbulent Flows Modelling

This quiz will check your basic understanding of turbulent flows.

Questions on turbulent models (RANS and LES) and DNS are also added in the quiz.

Try to attempt all the questions.

For any query you can email: cfdflwoengineering@gmail.com

1 / 17

To capture anisotropic Turbulent stress near the curved surface, which of following turbulent model is more suitable

Seven Equations RANS Model

k -ε Turbulent Model

k -ω Turbulent Model

One Equation Model

2 / 17

To capture turbulent flow correctly over a circular cylinder with less computational effort, which of following turbulent model is used in RANS family

Spalart–Allmaras model

k-ε Turbulent Model

SST k-ω Model

7 Equations Turbulent Model

3 / 17

For two equation k - ω turbulent flow, ω represents the following:

Specific dissipation rate

Frequency of fluctuation

Square root of enstropy of fluctuating part

All the above

4 / 17

In two equation turbulent flow (k-ε), the ε represents

Dissipation of heat energy

Dissipation of turbulent kinetic energy

Loss of Pressure Energy

Increase of Turbulent Kinetic Energy

5 / 17

For two equations (k-ε )turbulent modelling which equations are solved

Reynolds Averaged Navier stokes Equations (RANSE)

Instantaneous Navier stokes Equations

Fluctuating Navier stokes Equations

Steady state Navier stokes Equations

6 / 17

In the turbulent flow, the shear stress is increased due to

Density of fluid

Eddy viscosity of the fluid

Dynamic viscosity of fluid

Kinematic viscosity of fluid

7 / 17

In the turbulent boundary layer of internal pipe flow, the thickness of laminar sublayer is given as δ

5 (ν/u*)

11.6 (ν/u*)

20 (ν/u*)

(ν/u*)

8 / 17

For flow over a flat plate, the boundary layer thickness (δ) for turbulent flow at a distance x with Reynolds number Re_x is directly proportional to

Reynolds Number, Rex

(Rex)^0.2

Distance from leading edge, X

Density

9 / 17

In the turbulent flow, the shear stress is increased due to

Density of fluid

Eddy viscosity of the fluid

Dynamic viscosity of fluid

Kinematic viscosity of fluid

10 / 17

The critical Reynolds number for a particular geometry and fluid properties is essential because it determine

Inlet conditions

Transition region between laminar and turbulent layer

Thickness of boundary layer thickness

Fluxes near wall

11 / 17

The critical Reynolds number defined based on the pipe diameter (D) for flow through a circular pipe for turbulent flow

Reynolds number for flow through a circular pipe

Re > 5000

Re > 3000

Re > 2300

Re > 10000

12 / 17

For flow over a flat surface, the flow is said to be fully developed turbulent flow when Reynolds number defined on inlet velocity (U) and length from leading edge (L)

Reynolds number for Flat plate Boundary layer

Re < 10^3

Re > 10^4

Re > 3 x 10^3

Re > 5 x 10^3

13 / 17

In large eddy simulation, which scales are resolved

Bigger than mesh size

Smaller than bigger mesh cell

Smaller than mesh

Diameter or length of Geometry

14 / 17

In LES simulation, which of the following governing equations are solved

Instantaneous Navier-Stokes equations

Instantaneous Filtered Navier-Stokes equations

Reynolds Averaged Navier-Stokes equations

All above

15 / 17

In LES simulations, subgrid scales models (SGC) are used to find

Average Velocity

Model scales smaller than filter size

Turbulent viscosity

Filtered Quantities

16 / 17

In Direct Numerical simulation, the cost of the simulation depends on

Reynolds number

Turbulent Viscosity

Mesh Density

Instantaneous Navier-Stokes equations

17 / 17

In a direct numerical simulation (DNS) which governing equations are solved

Instantaneous Navier-Stokes equations

Linearizing the Partial differential equation

Turbulent Energy equations

Reynolds Averaged Navier-Stokes equations (RANS)

Your score is

The average score is 42%

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Quiz Questions on CFD Modelling of Combustion

Online Quiz on numerical modeling of combustion is given below

1 / 24

The coal combustion, the two-reaction devolatilization model is used

coal combustion processes

To find volatile yields at high heating rate

To find volatile yields at high reaction rate

when the high volatile products in the bituminous coals

To find devolatiles products

2 / 24

In the single first-order reaction (SFOR) devolatilization model, the kinetic rate

k_v = A_v exp (-T_v/T_p) is determined by

Numerical simulation

Experimental data

Analytical method

None of above

3 / 24

The Arrehunis reaction model is used

To model turbulent-chemistry reaction model

To model turbulent flow in combustion

To model the reactive flow in combustion

To model the species flow with turbulence

4 / 24

The coal combustion, the single reaction devolatilization model is used

To find volatile yields at high heating rate

To find volatile yields at high reaction rate

To find devolatile products at high combustion rate

To find devolatile products

5 / 24

A turbulent flame brush is an ensemble of discrete, steady laminar flames which is called as

Laminar flame front

Turbulent flame

Flammelet

Diffusion flame

6 / 24

Turbulent non-premixed flames are modeled using the mean mixture fraction which is defined as the ratio

Mass flow rate of fuel to air flow rate

Mass flow rate of fuel to total mass of air and fuel

Total mass of air and fuel to mass flow rate of fuel

Fuel species concentration in total gas mixture

7 / 24

Diffusion Flame Models are used only for simulations of

Solid combustion

Liquid Combustion

Gaseous combustion

Homogenous combustion

8 / 24

Which phenomena is not accounted for in non-premixed combustion modeling

Ignition and extinction

Rapid combustion

Flame shapes

Radicals formations

9 / 24

Non -premixed Combustion Models is used for

Turbulent flow

Fast chemistry

Equilibrium Chemistry

Non equilibrium Chemistry

All bove

10 / 24

Which is Turbulent flame Speed for Premixed Flames

Venturi-Burner-premixed combustion

Zimmot and Peter flame speed model

Laminar flame speed model

Progress Variable C equation

all above

11 / 24

The premixed combustion is modeled with additional equations apart from mass, momentum, and energy

Progress variables equations

Mixture fraction equations

Radiation Transport equations

Species Transport equations

12 / 24

Turbulent Premixed Combustion Models are applicable for

High Reynolds Number

Premixed configuration only

Fast Chemistry

All above

13 / 24

Which of the following is an example of Premixed Flames

Diesel engine combustion

Spark ignited gasoline engine combustion

Candle flame

Wood fire

14 / 24

Which fuel has the highest flammability limits

Natural Gas

Kerosene oil

Raw fuel gas

Hydrogen

15 / 24

In boilers and furnaces, which combustion model is suitable to the term of Model Turbulent Chemistry Interaction (TCI)

Thermal radiation in biomass combustion

Eddy Dissipation Model

Finite Rate Chemistry Model

Eddy Concept Model

Species Transport Model

16 / 24

In combustion, Slow rate reaction is modeled based on which assumption:

Basic of solid fuel combustion mechanism — Basic solid fuel combustion mechanism

DamKohler number is less than 1

DamKohler number is greater than 1

Reynolds Number is more than 50000

Prandlts Number more than 1

17 / 24

The rate of reaction progress depends on which following variables:

Hydrocarbon combustion reaction

Flow rate of air and fuel

Arrhenius constant and concentration of reactants

Stoichiometric coefficients in reactions

Mixing flow time of reactant

18 / 24

The total enthalpy of combustion of liquid is defined as the sum of

Enthalpy of formation

Enthalpy of formation, Sensible enthalpy and Phase Change enthalpy

Enthalpy of formation and Sensible enthalpy

Heating value of fuel

19 / 24

Which of the following statements is true for liquid combustion

Flash point is higher than fire point

Auto-Ignition temperature is higher than fire point

Fire point is higher than ignition temperature

Both fire and auto-ignition point are same

20 / 24

The equivalent ratio is defined as the ratio of the following :

Actual fuel-air ratio (FAR) to theoretical FAR

Actual air to fuel ratio (AFR) to theoretical AFR

Excess air above theoretical air

Actual air flow rate to theoretical air flow rate

21 / 24

Combustion is defined by which following reaction

Combustion mixing reaction

Exothermic Reaction

Majorly Exothermic and partly endothermic

Endothermic

Isobaric

22 / 24

Combustible substance (fuel) is defined as below

Hydrocarbon combustion reaction

Which has highest electronegativity

Which has lowest electronegativity

Which Contains only Hydrocarbon

Which oxidises easily

23 / 24

What are the Essential Conditions for Combustion to occur in

Presence of Fuel

Presence of Oxidisers

Ignition source

All above

24 / 24

Which is of the following is the first step of solid fuel combustion like coal and wood

Oxidation

Pyrolysis

Decompositon

Dehydration

Your score is

The average score is 65%

0%

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