Related InterviewSolutions

• Which of these models is a hybrid of LES and RANS?(a) DNS model(b) DES model(c) WALE model(d) RNG – LES modelI had been asked this question during an online exam.This interesting question is from Turbulence Modelling topic in chapter Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• How does the turbulent boundary layer vary with respect to the Reynolds number?(a) Rex^–\(\frac {1}{5}\)(b) Rex^–\(\frac {1}{4}\)(c) Rex^–\(\frac {1}{2}\)(d) Rex^-2I have been asked this question in an interview for internship.Question is from Turbulence Modelling topic in chapter Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• What is the skin friction drag for an incompressible turbulent flow with Reynolds number =1.5 × 10^7 over a flat plate?(a) 2.72 × 10^-3(b) 5.41 × 10^-3(c) 3.82 × 10^-3(d) 2.91 × 10^-3The question was posed to me in an online interview.I'd like to ask this question from Turbulence Modelling in division Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• What is the equation for momentum thickness?(a) δ^* = \(\int_0^∞ \frac {u}{U_e} \big [ \)1 – \(\big ( \frac {u}{U_e} \big )^2 \big ] \)dy(b) δ^* = \(\int_0^∞ \frac {u}{U_e} \big [ \)1 – \(\frac {u}{U_e}\big ] \)dy(c) δ^* = \(\int_0^∞ \big [ \)1 – \(\frac {u}{U_e} \big ] \)dy(d) δ^* = \(\int_0^∞ \frac {u}{U_e} \big [ \)1 + \(\frac {u}{U_e} \big ]\)dyThe question was asked during an interview.Question is taken from Boundary Layer Properties topic in section Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• Which of these is a two – equation model?(a) Baldwin – Lomax model(b) Prandtl’s equation model(c) Spalart – Allmaras model(d) K – Epsilon modelThis question was addressed to me during a job interview.Question is taken from Turbulence Modelling topic in division Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• The displacement thickness is the distance by which, due to the presence of the boundary layer, the flow streamline is displaced.(a) True(b) FalseI got this question by my college director while I was bunking the class.My question is based upon Boundary Layer Properties topic in division Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• Which of these relations is applicable for turbulent and laminar boundary layer?(a) δTturbulent < δTlaminar(b) δTturbulent = δTlaminar(c) δturbulent < δlaminar(d) δturbulent > δlaminarThis question was posed to me in homework.This key question is from Boundary Layer Properties in chapter Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• When there’s flow over a flat plate, there’s laminar boundary layer at the leading edge followed by turbulent boundary layer.(a) True(b) FalseThis question was addressed to me during an interview.I'd like to ask this question from Boundary Layer Properties in section Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• Which of these is not a property of boundary layer?(a) No – slip condition at the surface(b) Temperature of fluid at the surface is equal to wall temperature(c) Flow velocity increases along y – direction(d) Thermal boundary layer is equal to velocity boundary layerThe question was asked in an interview.This is a very interesting question from Boundary Layer Properties in portion Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics
• One equation turbulence model account for the history effects such as turbulent energy, diffusion and convection.(a) True(b) FalseI got this question during an online exam.I would like to ask this question from Turbulence Modelling topic in division Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions of Aerodynamics