Uploaded on
06 Mar 2023
Skill-Lync
The field of fluid mechanics, known as Computational Fluid Dynamics, or CFD combines data structures and numerical analysis to solve and study fluid flow problems. CFD engineers can start their careers in the automotive, chemical, electronics, or aerospace industries.
CFD engineers utilise their expertise to develop new components for machinery. They create and test prototypes and perform analysis to optimise the efficiency of the existing or new parts and components. The average salary of a CFD engineer in India is ₹5,60,421 yearly.
Here we have listed a few basic CFD interview questions for aspiring candidates.
Sample answer:
I will begin by compiling all the data I require for the project I'm working on. This contains the client's or stakeholders' requirements, existing data or research, and the simulation's objectives.
Using the preferred CFD simulation tool will construct a mesh.
Finally, I will report the simulation results to respective stakeholders or clients.
The fundamental procedure for carrying out a CFD analysis is described here:
Sample answer:
If the flow characteristics remain constant with distance along the flow path, the fluid flow is considered to be uniform. Also, if the flow characteristics change and vary at various places along the flow channel, the fluid flow is not uniform. For achieving a uniform flow the cross-section of the flow path must be kept constant.
The flow of a fixed discharge through a pipe that tapers is called non-uniform flow. An excellent illustration of such flow is water flowing through a river with a constant discharge because the river's width typically changes with distance yet the rate of water flow remains constant.
Sample answer:
When a fluid flows in minuscule parallel layers without interruption, it is said to be laminar. Laminar flows consist of parallel-moving fluid layers with no currents, eddies, or swirls that are typical of the flow itself. Because non-crossing streamlines characterise it, this form of flow is also known as streamline flow.
Sample answer:
According to Newton's law of viscosity, the shear stress for a flowing fluid is inversely proportional to the shear strain rate. Viscosity is a physical characteristic that describes the flow resistance of simple fluids.
With a given temperature and pressure, the ratio of shear stress to shear rate is constant and is known as the viscosity or coefficient of viscosity. Newtonian fluids obeys Newton's law of viscosity.
Sample answer: The ratio of inertial and viscous forces is expressed by the dimensionless quantity known as the Reynolds number (Re). Although Osborne Reynolds discovered it as the measure to detect the transition between laminar and turbulent flows, George Gabriel Stokes first introduced the idea in 1851.
The Reynolds number is theoretically defined as
Re = ρud/μ = ud/v where:
ρ is the fluid's density.
u is the fluid's macroscopic speed.
D is the diameter.
v is the fluid's dynamic viscosity.
Sample answer:
Numerical viscosity results from either re-zoning processes employed in Lagrangian formulations or discrete approximations to the momentum advection factors in Eulerian equations. The use of a homogenising assumption in the underlying elements or control volumes of the approximation scheme is the cause of the impact.
Sample answer:
Turbulence models are mathematical models used to simulate the effects of turbulent flow in a fluid. They are used to predict the behaviour of a fluid in a variety of situations, such as in aerodynamics, hydrodynamics, and combustion.
Turbulence models can be divided into two main categories:
Sample answer:
The main difference between a rocket nozzle and an ablation jet is the way in which they generate thrust. A rocket nozzle uses the combustion of fuel to generate thrust, while an ablation jet uses the ablation of material from the nozzle walls to generate thrust. Additionally, a rocket nozzle is typically designed to be more efficient than an ablation jet, as it is able to generate significant thrust with less fuel. Finally, a rocket nozzle is meant to be more durable than an ablation jet, as it is able to withstand higher temperatures and pressures.
Sample answer:
The ratio of the gas phase's velocity to the liquid phase's velocity is known as the slip ratio (or velocity ratio) in a gas-liquid flow.
The slip ratio in the homogeneous model of two-phase flow is, by definition, taken to be 1 (no slip). However, experimental findings show that, depending on the flow pattern, the velocities of the gas and liquid phases might differ dramatically (e.g. plug flow, annular flow, bubble flow, stratified flow, slug flow, churn flow). Separated flow models are those that take the existence of the slip into consideration.
Sample answer:
Subsonic flow is a type of fluid flow in which the speed of the fluid is less than the speed of sound. This type of flow is characterised by a gradual decrease in pressure and velocity as the fluid moves downstream. The flow is typically laminar and is characterised by low turbulence.
Job interviews are like the preliminary rounds for you to start your career. The above-mentioned questions will give a basic overview of the possible questions that you can expect in a technical interview round for the role of a CFD engineer.
For a detailed interview preparation strategy, enrol in Skill-Lync’s PG Program in Computational Fluid Dynamics. It is a mentor-led course that will teach you key technical skills and help you prepare for interviews.
Talk to our experts to know more about our offerings.
Author
Anup KumarH S
Author
Skill-Lync
Subscribe to Our Free Newsletter
Continue Reading
Related Blogs
Explore the fundamentals of vehicle dynamics and ultimate trends in the field from design and modeling to control with Skill Lync's exclusive course on the subject. Read about how Skill-Lync's CAE courses can help you get employed.
29 Jul 2020
In this article, we will briefly discuss the working, applications, and features of the one-dimensional systematic simulation tool, GT-Power, in Emission Control Strategy, engine calibration, hybrid vehicle modeling. Read about how Skill-Lync's CAE courses can help you get employed.
29 Jul 2020
This article offers a brief introduction to the globally accepted standard of Geometric Dimensioning and Tolerancing, and its importance for the entire manufacturing process. Read about how Skill-Lync's CAE courses can help you get employed.
29 Jul 2020
In this blog we will read about Going a step into Biomechanics and how Skill-Lync's CAE course will help you get employed.
10 May 2020
The powertrain is the most prominent source of vibrations that affects the driving experience for the people on board. This blog from Skill-Lync examines these vibrations to help enhance that experience.
22 Aug 2020
Author
Skill-Lync
Subscribe to Our Free Newsletter
Continue Reading
Related Blogs
Explore the fundamentals of vehicle dynamics and ultimate trends in the field from design and modeling to control with Skill Lync's exclusive course on the subject. Read about how Skill-Lync's CAE courses can help you get employed.
29 Jul 2020
In this article, we will briefly discuss the working, applications, and features of the one-dimensional systematic simulation tool, GT-Power, in Emission Control Strategy, engine calibration, hybrid vehicle modeling. Read about how Skill-Lync's CAE courses can help you get employed.
29 Jul 2020
This article offers a brief introduction to the globally accepted standard of Geometric Dimensioning and Tolerancing, and its importance for the entire manufacturing process. Read about how Skill-Lync's CAE courses can help you get employed.
29 Jul 2020
In this blog we will read about Going a step into Biomechanics and how Skill-Lync's CAE course will help you get employed.
10 May 2020
The powertrain is the most prominent source of vibrations that affects the driving experience for the people on board. This blog from Skill-Lync examines these vibrations to help enhance that experience.
22 Aug 2020
Related Courses