Preview Questions Aerodynamics Engineer | Role Specific Skill

Question 1: What is the key difference between Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) in CFD?

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LES resolves the large eddies while modeling smaller scales

DNS is computationally more efficient

LES does not account for turbulence at all

DNS resolves all turbulence scales directly

Question 2: What impact does increased mesh density have on the accuracy of CFD simulations in automotive aerodynamics?

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It simplifies the geometry of the vehicle

It has no significant impact on accuracy

It reduces computational cost

It improves the accuracy of results, especially in boundary layers

Question 3: What is the main difference between a steady-state and transient CFD simulation in automotive aerodynamics?

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Transient simulations solve for the time-dependent flow behavior

Transient simulations ignore the vehicle's motion

Steady-state assumes constant fluid properties over time

Steady-state simulations involve more detailed geometry

Question 4: What is the significance of the Strouhal number in fluid flow?

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Relates flow frequency to characteristic length

Measures energy dissipation

Indicates heat transfer rates

Determines pressure loss

Question 5: Which of the following methods is most effective in minimizing the wake behind an automotive vehicle during aerodynamic testing?

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Decreasing the frontal area

Increasing vehicle weight

Reducing the rear-end surface area

Adding rear spoilers and diffusers

Question 6: Which type of flow is most desirable around the rear of a vehicle to minimize drag?

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Attached flow

Turbulent

Laminar

Separated