Abstract
We study the time evolution of a rotating, axisymmetric, viscous accretion flow around black holes using a grid-based finite difference method. We use the Shakura–Sunyaev viscosity prescription. However, we compare with the results obtained when all the three independent components of the viscous stress are kept. We show that the centrifugal pressure supported shocks become weaker with the inclusion of viscosity. The shock is formed farther out when the viscosity is increased. When the viscosity is above a critical value, the shock disappears altogether and the flow becomes subsonic and Keplerian everywhere except in a region close to the horizon, where it remains supersonic. We also find that as the viscosity is increased, the amount of outflowing matter in the wind is decreased to less than a percentage of the inflow matter. Since the post-shock region could act as a reservoir of hot electrons or the so-called Compton cloud, the size of which changes with viscosity, the spectral properties are expected to depend on viscosity strongly: the harder states are dominated by low angular momentum and the low-viscosity flow with significant outflows while the softer states are dominated by the high-viscosity Keplerian flow having very little outflows.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Chakrabarti, S. K. (1989). Astrophysical Journal, 347, 365.
Chakrabarti, S. K. (1990a). Theory of transonic astrophysical flows. Singapore: World Scientific.
Chakrabarti, S. K. (1990b). MNRAS, 243, 610.
Chakrabarti, S. K., & Molteni, D. (1995). MNRAS, 272, 80.
Chakrabarti, S. K., & Titarchuk, L. G. (1995). Astrophysical Journal, 455, 623.
Chakrabarti, S. K. (1996). Physics Report, 266, 229.
Chakrabarti, S. K. (1999). Astronomy and Astrophysics, 351, 185.
Chakrabarti, S. K., & Das, S. (2004). MNRAS, 349, 649.
Giri, K., & Chakrabarti, S. K. (2012). MNRAS, 421, 666.
Igumenshchev, I. V., & Beloborodov, A. M. (1997). MNRAS, 284, 767.
Igumenshchev, I. V., & Abramowicz, M. A. (2000). Astrophysical Journal, 130, 463.
Lee, S. J., Ryu, D., & Chottopadhya, I. (2011). Astrophysical Journal, 728, 142.
Molteni, D., Lanzafame, G., & Chakrabarti, S. K. (1994). Astrophysical Journal, 425, 161.
Molteni, D., Ryu, D., & Chakrabarti, S. K. (1996). Astrophysical Journal, 470, 460.
Paczyński, B., & Wiita, P. J. (1980). Astronomy and Astrophysics, 88, 23.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Copyright information
© 2015 Springer International Publishing Switzerland
About this chapter
Cite this chapter
Giri, K. (2015). Simulation of Viscous Accretion Flows. In: Numerical Simulation of Viscous Shocked Accretion Flows Around Black Holes. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-09540-0_6
Download citation
DOI: https://doi.org/10.1007/978-3-319-09540-0_6
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-09539-4
Online ISBN: 978-3-319-09540-0
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)