K-omega Model MCQ

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• Which of these is an advantage of the k-ω model over the k-ε model?
  ক

  Does not depend on the ε value

  খ

  Easier to integrate

  গ

  Can be applied for turbulent boundary layers

  ঘ

  Has only two extra equations
• Using k-ω model is difficult for ____________
  ক

  free stream

  খ

  boundary layer flows

  গ

  jet flows

  ঘ

  mixing layer flows
• The values of k and ω must be specified in ___________
  ক

  the inlet boundary conditions

  খ

  the outlet boundary conditions

  গ

  the wall boundary conditions

  ঘ

  the symmetry boundary conditions
• What is the unit of turbulence frequency?
  ক

  Turbulence frequency is dimensionless

  খ

  1/s2

  গ

  s

  ঘ

  1/s
• If k is the turbulent kinetic energy, what is the relationship between the turbulence frequency (ω) and dissipation rate of the turbulent kinetic energy (ε)?
  ক

  ω=ε/k

  খ

  ω=k/ε

  গ

  ω=ε2/k

  ঘ

  ω=k2/ε
• Which of these could not be modelled using the k-ε model, but can be modelled using the k-ω model?
  ক

  Turbulent jet flows

  খ

  Adverse pressure gradients in turbulent flows

  গ

  Boundary layer on turbulent flows

  ঘ

  Turbulent free flows
• What does the variable ω in the k-ω model stand for?
  ক

  Turbulence eddy size

  খ

  Turbulence eddy wavelength

  গ

  Turbulence frequency

  ঘ

  Turbulence large length scale
• The k-ω model adds ___________ to the RANS equations.
  ক

  three variables

  খ

  three equations

  গ

  two variables

  ঘ

  two equations