حالت های ویژه در حضور جریان با استفاده از ناویر استوکس خطی شده: هندسه حلقوی با جریان برشی – کامسول

Finding acoustic eigenmodes in problems solved with linearized convected acoustic interfaces can be a challenging task. The solution will most often return several non-acoustic vorticity and entropy modes. These are highly damped waves that do not propagate at the speed of sound but with the convected flow speed.

This tutorial model shows how the acoustic eigenmodes can be determined using the Linearized Navier-Stokes interface. The example studies modes in an annulus geometry with an analytical shear background-flow profile. The region search method is used to find the acoustic modes; they lie on or close to the real axis.