Question: Suppose you are using CFD to simulate flow through a duct in which there is a circular cylinder as in Fig. P157C. The duct is

Suppose you are using CFD to simulate flow through a duct in which there is a circular cylinder as in Fig. P15–7C. The duct is long, but to save computer resources you choose a computational domain in the vicinity of the cylinder only. Explain why the downstream edge of the computational domain should be further from the cylinder than the upstream edge.

FIGURE P15–7C

In Computational domain Out

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