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A vortex particle method for two-dimensional compressible flow. (English) Zbl 1130.76393
Summary: A vortex particle method is developed for simulating two-dimensional, unsteady compressible flow. The method uses the Helmholtz decomposition of the velocity field to separately treat the irrotational and solenoidal portions of the flow, and the particles are allowed to change volume to conserve mass. In addition to having vorticity and dilatation properties, the particles also carry density, enthalpy, and entropy. The resulting evolution equations contain terms that are computed with techniques used in some incompressible methods. Truncation of unbounded domains via a nonreflecting boundary condition is also considered. The fast multipole method is adapted to compressible particles in order to make the method computationally efficient. The new method is applied to several problems, including sound generation by corotating vortices and generation of vorticity by baroclinic torque.

##### MSC:
 76M23 Vortex methods applied to problems in fluid mechanics 76M28 Particle methods and lattice-gas methods 76Q05 Hydro- and aero-acoustics
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##### References:
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