High-resolution SPH simulations show that significant in-plane spreading and dissipation of returning tidal debris at pericenter is a low-resolution numerical artifact, supporting circularization via later stream-stream collisions instead.
Evolution of Debris of a Tidally Disrupted Star by a Massive Black Hole: Development of a Hybrid Scheme of the SPH and TVD Methods
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abstract
The evolution of the stellar debris after tidal disruption due to the super massive black hole's tidal force is difficult to solve numerically because of the large dynamical range of the problem. We developed an SPH (Smoothed Particle Hydrodynamics) - TVD (Total Variation Diminishing) hybrid code in which the SPH is used to cover a widely spread debris and the TVD is used to compute the stream collision more accurately. While the code in the present form is not sufficient to obtain desired resoultion, it could provide a useful tool in studying the aftermath of the stellar disruption by a massive black hole.
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Anomalous pre-intersection dissipation in TDE simulations is numerical in origin, arising from pericenter kinematics combined with algorithm sensitivities to converging versus diverging flows.
citing papers explorer
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Tidal disruption events with SPH-EXA: resolving the return of the stream
High-resolution SPH simulations show that significant in-plane spreading and dissipation of returning tidal debris at pericenter is a low-resolution numerical artifact, supporting circularization via later stream-stream collisions instead.
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On the origin of anomalous dissipation in simulations of tidal disruption events
Anomalous pre-intersection dissipation in TDE simulations is numerical in origin, arising from pericenter kinematics combined with algorithm sensitivities to converging versus diverging flows.