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Demonstrates weak-strong uniqueness and low Mach number behavior in isothermal fluid flows, suggesting reliable predictions for incompressible flows.
We study the flow of an isothermal compressible Newtonian fluid around a body that performs a (time-independent) rigid motion. We derive a weak-strong uniqueness principle, and show that in the low Mach number limit, the governing equation is well approximated by the Navier--Stokes equations for incompressible rotating flow. Both results are based on the derivation of a relative energy inequality for weak solutions to this exterior-domain problem.
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Eiter et al. (2026) studied this question.
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