Which of these following is used to match the outlet and inlet flow velocities?(a) uN,j = uN-1,j×\(\frac{M_{in}}{M_{out}}\)(b) uN-1,j = uN,j×\(\frac{M_{in}}{M_{out}}\)(c) uN-1,j = uN,j×\(\frac{M_{out}}{M_{in}}\)(d) uN,j = uN-1,j×\(\frac{M_{out}}{M_{in}}\)This question was addressed to me during an interview for a job.I want to ask this question from Boundary Conditions topic in portion Boundary Conditions of Computational Fluid Dynamics

Which of these following is used to match the outlet and inlet flow ve

1.	Which of these following is used to match the outlet and inlet flow velocities?(a) uN,j = uN-1,j×\(\frac{M_{in}}{M_{out}}\)(b) uN-1,j = uN,j×\(\frac{M_{in}}{M_{out}}\)(c) uN-1,j = uN,j×\(\frac{M_{out}}{M_{in}}\)(d) uN,j = uN-1,j×\(\frac{M_{out}}{M_{in}}\)This question was addressed to me during an interview for a job.I want to ask this question from Boundary Conditions topic in portion Boundary Conditions of Computational Fluid Dynamics
Answer» Right choice is (a) uN,J = uN-1,j×\(\frac{M_{in}}{M_{out}}\) Explanation: To match the flow velocities, velocity in the NODE immediate west of the outlet is multiplied by the mass ratio \(\frac{M_{in}}{M_{out}}\). This will help US to maintain CONTINUITY.

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