Related InterviewSolutions

• Consider a model of finite control volume (volume V and surface area S) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the net mass flow rate out of the surface area?(a) \(\iint_V\rho \vec{V}.dV\)(b) \(\rho \vec{V}.d \vec{S}\)(c) \(\iiint_V\rho \vec{V}.d\vec{S}\)(d) \(\iint_V\rho \vec{V}.d\vec{S}\)I got this question in examination.This question is from Continuity Equation topic in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Eulerian equations are suitable for which of these cases?(a) Compressible flows(b) Incompressible flows(c) Compressible flows at high Mach number(d) Incompressible flows at high Mach numberI had been asked this question during an online exam.My doubt is from Euler Equation in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Which of these statements hold true?(a) Diffusive flux is always positive(b) Diffusive flux is positive in the direction of the positive gradient of fluid property(c) Diffusive flux is positive in the direction of the negative gradient of fluid property(d) Diffusive flux is always negativeThis question was posed to me by my school teacher while I was bunking the class.This interesting question is from General Transport Equation topic in portion Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• When the general transport equation is written in the energy equation form, what does Γ become?(a) k(b) μ(c) σ(d) κThis question was addressed to me during a job interview.The doubt is from General Transport Equation topic in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Which of these is not an equivalent to for substantial derivative?(a) Lagrangian derivative(b) Material derivative(c) Total derivative(d) Eulerian derivativeThis question was addressed to me by my college director while I was bunking the class.My doubt is from Governing Equations topic in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Which of the following frame of references does this diagram represent?(a) Polar(b) Cartesian(c) Lagrangian(d) EulerianI have been asked this question by my school principal while I was bunking the class.This interesting question is from Governing Equations topic in chapter Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Energy conservation equation is necessary to solve this property of fluid flow.(a) Pressure(b) Temperature(c) Density(d) VelocityThis question was addressed to me at a job interview.Origin of the question is Equations of State topic in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Let B denote any property of a fluid flow. The statement of Reynolds transport theorem is “The instantaneous total change of B inside the _____________ is equal to the instantaneous total change of B within the ______________ plus the net flow of B into and out of the _____________”(a) Control volume, Control mass, Control volume(b) Control volume, Control volume, Control mass(c) Control mass, Control mass, Control volume(d) Control mass, Control volume, Control volumeThis question was addressed to me in unit test.The query is from Governing Equations topic in portion Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Consider an infinitesimally small fluid element with density ρ (of dimensions dx, dy and dz with mass δ m and volume δ V) moving along with the flow with a velocity \(\vec{V}=u\vec{i}+v \vec{j}+w\vec{k}\). The continuity equation is \(\frac{D\rho}{Dt}+\rho \nabla.\vec{V}=0\). Where does this second term come from?(a) Integral(b) The rate of change of element’s volume(c) Elemental change in mass(d) Local derivativeI have been asked this question in an online quiz.I need to ask this question from Continuity Equation topic in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics
• Which of these terms represent the convective derivative of temperature (T)?(a) \(\vec{V}.\nabla T\)(b) \(\frac{DT}{Dt}\)(c) ∇T(d) \(\frac{\partial T}{\partial t}\)The question was asked during an online exam.I'm obligated to ask this question of Governing Equations in section Governing Equations of Fluid Dynamics of Computational Fluid Dynamics