| Abstract : | Viscosity plays a vital role in accretion flows around black holes. It helps in the transport of angular momentum outwards allowing matter to get accreted into the potential well formed by the central compact object. Apart from angular momentum transport, viscosity also heats up the matter. In viscous transonic flows both with and without shock solutions are possible. Many numerical simulations have shown that with the increase in viscosity, shock moves outwards. However, all these simulations have been done with supersonic injection. In this work, we have showed both analytically as well as numerically that depending on the injection radius, the shock location will move inwards or outwards with the viscosity. Also, we have seen Viscous flow shows shock oscillation. This may explain the QPOs seen in black hole candidates. |
