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Rocket Engine Combustion

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Combustion in Rocket Engine and Its CFD Modeling by  Dr. Sharad N. Pachpute (PhD, IIT Delhi)   Modeling the Combustion System …

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Categories Combustion and Emissions

Turbulent Multiphase Combustion and CFD Modeling

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CFD Modeling of Turbulent Multiphase Combustion by  Dr. Sharad N. Pachpute Modeling the Combustion with Complex Physics and Chemistry Introduction …

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Categories Combustion and Emissions, Mutliphase Flow

CFD Modeling of Turbulent Combustion

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CFD modelling of turbulent combustion

Turbulent Combustion Modeling (Introduction to Combustion Models in FLUENT, Star CCM+ and OpenFOAM) by Dr. Sharad N. Pachpute (Ph.D.) Modeling …

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Categories Combustion and Emissions

Basics of Multi-phase Flow and its CFD Modeling

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Basics of Multi-Phase Flow and its CFD Modeling (Introduction to Multi-phase Models in ANSYS FLUENT, OpenFOAM and COMSOL)  By Dr. …

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Categories Mutliphase Flow

Combustion Basics for Beginner

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Understanding Combustible Flow  Dr. Sharad Pachpute(PhD, IIT Delhi) Fuels and Combustion  Introduction to combustion Combustion is the chemical reaction between …

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Categories Combustion and Emissions

CFD Modelling of Turbo-machinery

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Working Principle of turbo-machinery

 How to model Turbo-machinery using CFD simulations    Correct prediction  of Rotating fluid flow  for Better performance  By Dr. Sharad …

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Categories Turbo-machinery

Interesting Applications of Turbulent Jets

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What are the major applications of turbulent Jets in industries and nature? Author: Dr. Sharad N. Pachpute (PhD.) Overview of …

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Categories Turbo-machinery

Basics of CFD Modeling for Beginners

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An Introduction To Computational Fluid Dynamics (CFD) Author: Dr. Sharad Pachpute (PhD) Introduction to Flow Analysis Techniques In general, science …

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Categories CFD Basic and Fluid Flow

Turbulent Flow: Physics and Methods of Investigations

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Turbulent Flow: Physics and Methods of Investigations By  Dr. Sharad N. Pachpute (PhD, IIT Delhi)  Physics of Turbulence Turbulent flows …

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Categories CFD Basic and Fluid Flow
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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

2 / 20

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

3 / 20

The staggered grid is useful to overcome 

4 / 20

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

5 / 20

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

6 / 20

Which  is essential CFD input to carry out simulation

7 / 20

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

8 / 20

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

9 / 20

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

10 / 20

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

11 / 20

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

12 / 20

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

13 / 20

The momentum equation is based on

14 / 20

A control volume-based model results in which equation?

15 / 20

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

16 / 20

The continuity equation is derived based on

17 / 20

For the implicit method, which is the essential step?

18 / 20

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

19 / 20

The region  of interest for CFD analysis is carried is called

20 / 20

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

Your score is

The average score is 51%

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119
Created on January 24, 2023 By Dr. Sharad Pachpute
heat Transfer modelling

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

2 / 21

The radiative Heat transport equation is numerically solved for

Radiative Transport Equation

3 / 21

Radiation heat transfer is determined by which law

radiative heat transfer law

4 / 21

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

Thermal and momentum boundary layers

5 / 21

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

Reynolds number for Flat plate Boundary layer

6 / 21

Heat transfer coefficient in CFD simulation is calculated using

Thermal Boundary layer

7 / 21

what is the unit of heat transfer coefficient?

convective Heat transfer formula

8 / 21

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

Forced convection heat transfer

9 / 21

Convective heat transfer is calculated by which of the reference temperature

convective Heat transfer formula

10 / 21

Thermal conductivity for anisotropic is defined as

11 / 21

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

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

13 / 21

The unit heat transfer is given as

14 / 21

which of the following law the heat transfer takes place?

15 / 21

Which of the following is a method of heat transfer?

16 / 21

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

17 / 21

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

18 / 21

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

19 / 21

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

20 / 21

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

21 / 21

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

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

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

3 / 17

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

4 / 17

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

5 / 17

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

6 / 17

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

7 / 17

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

8 / 17

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

9 / 17

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

10 / 17

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

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

 

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

13 / 17

In large eddy simulation, which scales are resolved

14 / 17

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

15 / 17

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

 

16 / 17

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

17 / 17

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

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
coal combustion processes

2 / 24

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

kv = Av exp (-Tv/Tp) is determined by

3 / 24

The Arrehunis reaction model is used

4 / 24

The coal combustion, the single reaction devolatilization model is used

5 / 24

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

6 / 24

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

7 / 24

Diffusion Flame Models are used only for simulations of 

8 / 24

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

9 / 24

Non -premixed Combustion Models is used for 

10 / 24

Which is Turbulent flame Speed for Premixed Flames 

Venturi-Burner-premixed combustion

11 / 24

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

12 / 24

Turbulent Premixed Combustion Models are applicable for 

13 / 24

Which of the following is an example of Premixed Flames

14 / 24

Which fuel has the highest flammability limits

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
Thermal radiation in biomass combustion

16 / 24

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

Basic of solid fuel combustion mechanism
Basic solid fuel combustion mechanism

17 / 24

The rate of reaction progress depends on which following variables:

Hydrocarbon combustion reaction

18 / 24

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

 

19 / 24

Which of the following statements is true for liquid combustion

20 / 24

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

 

21 / 24

Combustion is defined by which following reaction

Combustion mixing reaction
Combustion mixing reaction

22 / 24

Combustible substance (fuel) is defined as below

Hydrocarbon combustion reaction

23 / 24

What are the Essential Conditions for Combustion to occur in 

24 / 24

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

Your score is

The average score is 65%

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