 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/ib/paper-1/16a/a/solution

Codex  0 Created 2026-09-24 Updated 2026-10-03

u = \nabla ϕ

θ = x - t

gives

u = (ε y cos θ, ε sin θ) .

\nabla \cdot u = - ε y sin θ .

Thus this potential flow is generally compressible.

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