CPCE Fluid Flow & Heat Transfer Analysis 2

Question 1

In CFD, the SIMPLE algorithm stands for which pressure-velocity coupling method?

Accepted Answer

Semi-Implicit Method for Pressure-Linked Equations

Answer

SIMPLE (Semi-Implicit Method for Pressure-Linked Equations) is the most widely used pressure-velocity coupling algorithm in incompressible flow solvers.

Question 2

What dimensionless number governs the ratio of inertial forces to viscous forces in a fluid flow?

Accepted Answer

Reynolds number

Answer

The Reynolds number Re = ρVL/μ characterizes the ratio of inertial to viscous forces and determines whether flow is laminar or turbulent.

Question 3

Which boundary condition type specifies a known heat flux at a wall in a CFD heat transfer simulation?

Accepted Answer

Neumann boundary condition

Answer

A Neumann boundary condition specifies the gradient of the dependent variable (heat flux) at the boundary rather than the value itself.

Question 4

In turbulent flow CFD modeling, what does the k-ε turbulence model solve for?

Accepted Answer

Turbulent kinetic energy and its dissipation rate

Answer

The k-ε model solves two transport equations: one for turbulent kinetic energy (k) and one for its dissipation rate (ε).

Question 5

For a flat plate in forced convection, how does the local heat transfer coefficient vary along the plate in the laminar boundary layer regime?

Accepted Answer

It decreases with distance from the leading edge

Answer

The local heat transfer coefficient decreases along the plate as the thermal boundary layer grows thicker with downstream distance in laminar flow.

(CPCE) Certified Professional CFD Engineer Practice Test

(CPCE) Certified Professional CFD Engineer Practice Test

CPCE Fluid Flow & Heat Transfer Analysis 2