Which of these time-steps are used to approximate the value at time-step t-\(\frac{\Delta t}{2}\) using the Crank-Nicolson scheme for finite volume approach?(a) t and t+Δ t(b) t and t-Δ t(c) t and t-\(\frac{\Delta t}{2}\)(d) t and t+\(\frac{\Delta t}{2}\)The question was asked during a job interview.My doubt is from Transient Flows in portion Transient Flows of Computational Fluid Dynamics

Which of these time-steps are used to approximate the value at time-st

1.	Which of these time-steps are used to approximate the value at time-step t-\(\frac{\Delta t}{2}\) using the Crank-Nicolson scheme for finite volume approach?(a) t and t+Δ t(b) t and t-Δ t(c) t and t-\(\frac{\Delta t}{2}\)(d) t and t+\(\frac{\Delta t}{2}\)The question was asked during a job interview.My doubt is from Transient Flows in portion Transient Flows of Computational Fluid Dynamics
Answer» RIGHT option is (b) t and t-Δ t The BEST I can explain: The Crank-Nicolson scheme USES the cell centres of both the cells which share the face which is considered. The face considered here is t-\(\frac{\Delta t}{2}\) . It is SHARED by the faces t and t-Δ t. So, the scheme uses both of these values for the approximation.

Discussion

No Comment Found

Related InterviewSolutions

When the first-order implicit Euler scheme is unconditionally stable, the solution is ________(a) stationary for large time-steps(b) oscillatory for large time-steps(c) stationary for small time-steps(d) oscillatory for small time-stepsThe question was posed to me during an interview.Query is from Transient Flows in chapter Transient Flows of Computational Fluid Dynamics
The stability of the two-level predictor-corrector method matches with that of the __________(a) midpoint rule(b) trapezoidal rule(c) backward Euler method(d) forward Euler methodI got this question in an interview for job.This intriguing question comes from Transient Flows in section Transient Flows of Computational Fluid Dynamics
Which of these statements is correct?(a) When the order of accuracy is the same for two methods, the accuracy is also the same(b) Runge-Kutta method interpolates at more than one point in a time interval(c) Runge-Kutta method is not a multipoint method(d) An n^th order Runge-Kutta method is more accurate than the n^th order multipoint methodI had been asked this question by my college director while I was bunking the class.The doubt is from Transient Flows in chapter Transient Flows of Computational Fluid Dynamics
In the two-level predictor-corrector method, the prediction is done using _____________(a) trapezoidal rule(b) explicit Euler method(c) midpoint rule(d) implicit Euler methodThe question was asked in an interview for job.I want to ask this question from Transient Flows in portion Transient Flows of Computational Fluid Dynamics
The numerical dispersion term of the second-order upwind Euler scheme is of ____________(a) third-order(b) second-order(c) first-order(d) no dispersionI had been asked this question during an online interview.The origin of the question is Transient Flows topic in chapter Transient Flows of Computational Fluid Dynamics
Which of these equations is the discretized form of the transient term using the first-order implicit Euler scheme?(a) \(\frac{(\rho_C\phi_C)^t-(\rho_C\phi_C)^{t+\Delta t}}{\Delta t} V_C+L(\phi_C^t)\)(b) \(\frac{(\rho_C\phi_C)^t-(\rho_C\phi_C)^{t-\Delta t}}{\Delta t} V_C+L(\phi_C^t)\)(c) \(\frac{(\rho_C\phi_C)^t+(\rho_C\phi_C)^{t+\Delta t}}{\Delta t} V_C+L(\phi_C^t)\)(d) \(\frac{(\rho_C\phi_C)^t+(\rho_C\phi_C)^{t-\Delta t}}{\Delta t} V_C+L(\phi_C^t)\)I got this question in an internship interview.This key question is from Transient Flows topic in chapter Transient Flows of Computational Fluid Dynamics
To overcome the performance issues of the PISO algorithm, which of these methods is used?(a) Time-steps based on temporal schemes are used(b) Large time-steps are used(c) First-order temporal differencing is used(d) Higher-order temporal differencing is usedI got this question by my college director while I was bunking the class.Asked question is from Transient SIMPLE and PISO Algorithms topic in section Transient Flows of Computational Fluid Dynamics
The order of temporal accuracy achieved by the PISO algorithm for pressure and momentum are ___________ and ___________ respectively.(a) four, three(b) two, three(c) three, four(d) four, twoThis question was addressed to me by my college director while I was bunking the class.My question is from Transient SIMPLE and PISO Algorithms in section Transient Flows of Computational Fluid Dynamics
Which of these is a disadvantage of the PISO algorithm?(a) memory required(b) small time-steps(c) computational cost(d) time requiredThe question was posed to me in unit test.Origin of the question is Transient SIMPLE and PISO Algorithms topic in division Transient Flows of Computational Fluid Dynamics
Which of these equations are altered by the transient term in the PISO algorithm?(a) both the first and second pressure-correction equations(b) only the first pressure-correction equation(c) only the second pressure-correction equation(d) neither the first nor the second pressure-correction equationsI got this question by my college professor while I was bunking the class.My query is from Transient SIMPLE and PISO Algorithms in portion Transient Flows of Computational Fluid Dynamics

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment