Armstrong Fluid Technology CFD Engineer Interview Questions and Answers

Q1. How to measure convergence?
Ans. 
Convergence in CFD analysis is measured by checking if the solution is not changing significantly with each iteration.
• Convergence is typically measured by monitoring residuals of key variables (e.g. velocity, pressure) over iterations. When residuals reach a small, acceptable value, convergence is achieved.

• Another method is to track the change in key parameters (e.g. mass flow rate, drag coefficient) between iterations...read more
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Q2. Experience with PowerFlow and ANSYS
Ans. 
Experience with PowerFlow and ANSYS
• I have extensive experience using PowerFlow for fluid dynamics simulations

• I am proficient in using ANSYS for structural analysis and thermal simulations

• I have successfully integrated PowerFlow and ANSYS for multiphysics simulations

• I have worked on projects where accurate CFD analysis was crucial for design optimization
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Q3. What is CFL number?
Ans. 
CFL number is a dimensionless number used in fluid dynamics to determine the stability of a numerical simulation.
• CFL number stands for Courant-Friedrichs-Lewy number.

• It is calculated as the product of the flow velocity, time step, and grid spacing, divided by the fluid kinematic viscosity.

• A CFL number greater than 1 indicates that the simulation is unstable and may lead to inaccurate results.

• A CFL number less than 1 en
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Q4. What is difference between RAN, LES and DNS
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RAN, LES, and DNS are different approaches used in computational fluid dynamics (CFD) to model turbulent flows.
• RAN (Reynolds-Averaged Navier-Stokes) models average the flow properties over time, suitable for industrial applications.

• LES (Large Eddy Simulation) resolves large turbulent structures while modeling smaller ones, suitable for complex flows.

• DNS (Direct Numerical Simulation) solves all scales of turbulence with...read more
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Q1. Role responsibility,
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Q1. Tool test, on NX
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Q1. Tell me about yourself
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Q1. Thought it was a interview for the post of design engineer but interviewer was interested to pointing out personal details in an unmannered way. In a 12 out of 15 minute of total time span during interview...read more
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Q2. They ask questions from irrelevant subjects not from required skills one needed for job role
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Basic mechanical and logical questions were given

Q1. Technical discussion with the lead based on your previous experiences and your attitude will be tested here.
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Q1. Final discussion for CTC and other benefits
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Q1. He is first ask a questions from your resume only so don't put unwanted words in your resume
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Q2. What is stress and strain, governor purpose, about kone, etc..
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Q1. What kind of project have you worked on?
Ans. 
I have worked on designing a solar-powered irrigation system for a rural community.
• Researched solar panel efficiency and irrigation system requirements

• Designed a system that could pump water from a well using solar energy

• Implemented sensors to monitor soil moisture levels and control water flow

• Collaborated with local community members to ensure system met their needs
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Q2. What motivates you to join this company?
Ans. 
I am motivated to join this company because of its reputation for innovation, collaborative work environment, and opportunities for professional growth.
• Reputation for innovation: I am excited to work for a company that is known for pushing boundaries and developing cutting-edge technologies.

• Collaborative work environment: I thrive in environments where teamwork and communication are valued, and I believe this company f...read more
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Q1. "How much work experience do you have in structural design?"""
Ans. 
I have 8 years of work experience in structural design.
• I have worked on various projects involving structural design for commercial buildings, bridges, and residential homes.

• I have experience in using software such as AutoCAD, Revit, and SAP2000 for structural analysis and design.

• I have collaborated with architects, contractors, and other engineers to ensure the structural integrity of the designs.

• I have a strong under...read more
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Questions on logical and quants

Q1. What is Bernoulli principle?
Ans. 
Bernoulli principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
• States that as the speed of a fluid increases, its pressure decreases

• Used to explain lift in airplane wings

• Applies to various fluid dynamics situations such as flow through pipes
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Q2. What is stress and how it can be measured?
Ans. 
Stress is a force acting on a material that causes deformation. It can be measured using techniques like strain gauges and load cells.
• Stress is a measure of the internal forces within a material resisting deformation.

• It is typically measured in units of force per unit area, such as Pascals or pounds per square inch.

• Common methods of measuring stress include strain gauges, load cells, and extensometers.

• Stress can be cat...read more
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