Quiz on Computational Fluid Dynamics

What is the primary focus of the course mentioned in the text?

• Thermodynamics

• Computational Fluid Dynamics

• Structural Analysis

• Material Science

What is the recommended y+ value for the first cell when using wall functions?

• y+ = 1

• 30 < y+ < 300

• y+ < 30

• y+ > 300

Which turbulence model is recommended when resolving the viscous sublayer?

• RNG k-ε model

• SST k-ω model

• k-ω model

• k-ε model

What is the effect of increasing the Reynolds number on the logarithmic region?

• It decreases

• It remains constant

• It extends to higher values of y+

• It becomes negligible

What is the purpose of wall functions in CFD?

• To resolve the entire flow field

• To increase computational speed

• To determine conditions at the wall

• To simplify turbulence modeling

What is the recommended first grid cell height for a y+ of approximately 50?

• 10 mm

• 0.5 mm

• 1 mm

• 0.1 mm

What should be done if the viscous sublayer is being resolved?

• Ignore turbulence modeling

• Use k-ω models with Enhanced Wall Treatment

• Use k-ε models

• Use wall functions

What is the default turbulent intensity value when no information is available?

• 1%

• 5%

• 10%

• 15%

What is the guideline for the growth rate of the prism layer mesh?

• No higher than 1.5

• No higher than 1.0

• No higher than 1.2

• No higher than 2.0

What happens when logarithmic-based wall functions are not applicable?

• Use a different turbulence model

• Use wall functions anyway

• Ignore the boundary layer

• Resolve the viscous sublayer with the mesh