Beam Generated Vorticity and Convective Channel Mixing.
NAVAL RESEARCH LAB WASHINGTON DC
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Asymmetries in density and pressure gradients exist when a beam deposits energy off center in a hot gaseous channel formed by a previous beam or discharge. These asymmetries, coupled with the natural dynamics of the expanding compound channel, cause vortex filaments to be generated which propagate unabated long after motion would have ceased in a symmetric flow. This concentrated vorticity is a source of convective turbulent cooling of the hot channels. In this paper we present a theory for the amount of vorticity generated as a function of asymmetry and system parameters and calibrate this theory using detailed numerical simulations. An estimate of the convective mixing time for such composite channels is constructed using the strength of the asymmetry-generated vortex filaments as a source term. Author
- Plasma Physics and Magnetohydrodynamics