Sub Grid Models MCQ

Test your knowledge with important Sub Grid Models MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Sub Grid Models MCQs at Bissoy

• ___________ creates a problem in the SGS models.
  ক

  Low Reynolds number flows

  খ

  High Reynolds number flows

  গ

  Anisotropic flow near the wall

  ঘ

  Viscous flow near the wall
• The SGS model uses _________ to reduce the sub-grid-scale eddy viscosity near the wall.
  ক

  van Karman’s constant

  খ

  van Driest damping

  গ

  wall function

  ঘ

  Leonard stresses
• The Smagorinsky-Lilly SGS model is ___________
  ক

  Dissipative

  খ

  Convective

  গ

  Diffusive

  ঘ

  Convective and diffusive
• In the higher-order SGS model, what is the velocity scale used?
  ক

  The ratio of the SGS turbulent kinetic energy to the SGS eddy viscosity

  খ

  The product of the SGS turbulent kinetic energy and the SGS eddy viscosity

  গ

  The square root of the SGS eddy viscosity

  ঘ

  The square root of the SGS turbulent kinetic energy
• Which of these assumptions is made in the Smagorinsky-Lilly SGS model?
  ক

  The changes in the flow direction are slow in the resolved flow

  খ

  The changes in the cross-stream direction are slow in the resolved flow

  গ

  The changes in the flow direction are slow in the SGS eddies

  ঘ

  The changes in the cross-stream direction are slow in the SGS eddies
• The characteristic length of the SGS eddies is __________
  ক

  half of the filter cut-off width

  খ

  the filter cut-off width

  গ

  twice the filter cut-off width

  ঘ

  thrice the filter cut-off width
• According to the Smagorinsky-Lilly SGS model, the SGS stresses depend on the ___________
  ক

  Rate of strain of the SGS eddies

  খ

  Rate of strain of the resolved flow

  গ

  Strain of the resolved flow

  ঘ

  Strain of the SGS eddies
• The Smagorinsky-Lilly (Sub-Grid-Scale) SGS model uses ___________
  ক

  Boussinesq hypothesis and Prandtl mixing length model

  খ

  Prandtl mixing length model and k-ε model

  গ

  k-ε model and k-ω model

  ঘ

  k-ω model and Boussinesq hypothesis