Tidal waves in accretion discs

A tidal wave developing in a cold disc (e.g. in CVs) due to a small mass companion.

Click here to see it (MPEG version 9.2Mb! this one is HEAVY and SLOW).
The inner disc is shown in details here (MPEG version 6.0Mb!).
Eccentric (m=1) oscillations appear during the relaxation and might explain Quasi-periodic Oscillations (QPOs) (MPEG version 0.5Mb) CVs.
Eventually a Papaloizou-Pringle instability develops in the inner disc (m=8 mode), (MPEG version 1.2Mb). rotating counter clockwise (stroboscopic effects might let you think the opposite).

Numerical simulations of a tidal wave induced by a planet in a protostellar disc, and the development of a Paploizou-Pringle instability (initially an m=3 mode and eventually an m=2 mode) at the inner reflective boundary.

Click there to see (MPEG version 5Mb!).

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