HAB-ViscousResistance

CFD means...

• Colorful Fluid Dynamics

• Colors for Directors

• Computer Flow Demonstrator

• Computational Fluid Dynamics

Friction coefficient in turbulent flows

• Increases with Re

• Decreases with Re

Verification means...

• To determine the real value of the numerical error

• To estimate uncertainty in modeling real phenomena

• To evaluate software's quality

• To determine the error compared to experimental results

From the following, select all the characteristics of turbulence (may be more than one)

• Deterministic

• Diffusive

• Occurrence at low Re

• Steady

• Dissipative

Turbulence transforms energy into heat through the bigger eddies

• True

• False

How do RANS model turbulence?

• Averaging fields in time

• Averaging fields in space

• Solving vortices that do not dissipate into heat

• They resolve all scales in time and space

The turbulence model that we are using in OpenFOAM to solve the flow around a ship is the...

• k-epsilon model

• k-omega-SST model

• Boussinesq model

• Reynolds Stress model

To solve the boundary layer near the wall we can use models called inner functions

• True

• False

Preston tubes are used to determine...

• Wave resistance

• Viscous resistance

• Friction resistance

• Pressure resistance

The effect of transverse curvature in a ship is...

• A reduction in boundary layer thickness and an increase in shear stress

• An increase in boundary layer thickness and a reduction in shear stress

• An increase in boundary layer thickness and an increase in shear stress

• A reduction in boundary layer thickness and a reduction in shear stress