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Consider the general discretized equation aPΦP=aWΦW+aEΦE+S. Which of these will become zero for the left boundary node?

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Consider the general discretized equation aPΦP=aWΦW+aEΦE+S. Which of these will become zero for the left boundary node?

(a) ΦE

(b) aE

(c) ΦW

(d) aW

I had been asked this question in an online interview.

The query is from FVM for 1-D Steady State Diffusion in portion Diffusion Problem of Computational Fluid Dynamics

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Correct option is (d) aW

For explanation I would say: For the left boundary node, there is no western node present. It has only one neighbour on the eastern side. So, the western node coefficient aW is set to zero. ΦW is not zero as we do not know the flow variable at that point and cannot assume.

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