103 / 2026-03-30 00:50:00

Enhancement of self-similar growth in multimode ablative Rayleigh–Taylor instability by self-generated magnetic fields

ablative Rayleigh–Taylor instability,self-generated magnetic field,Magnetized heat flux,self-similar growth

极端条件下的基础物理 > 流体力学界面不稳定性

The self-generated magnetic field coupled with the growth of multimode ablative Rayleigh–Taylor instability (ARTI) is investigated by numerical simulations with Nernst effects, resistivity and magnetized heat conduction taken into account. It is found that intense magnetic fields about 1 kT can be generated in multimode ARTI via the Biermann-battery source and the Nernst amplification. The enhancement of the self-similar growing coefficient \(\alpha_b\) caused by self-generated magnetic fields is attributed to the reinforcement of the vorticity inside the bubbles. It is also found that \(\alpha_b\) is enhanced more significantly in cases where the perturbation spectra contain more short-wavelength components. The formula for the dependence of \(\alpha_b\) on the initial perturbation amplitude proposed in Zhang et al (2018 Phys. Rev. Lett. 121 185002) remains applicable, but requires a modified coefficient to account for the attenuation of ablative stabilization due to self-generated magnetic fields.