Smoothed particle hydrodynamics simulations of gas and dust mixtures
Smoothed particle hydrodynamics simulations of gas and dust mixtures
复制标题
气体和粉尘混合物的平滑颗粒流体动力学模拟
DOI:
10.1093/mnras/stv1486
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发表时间:
2015
影响因子:
4.8
通讯作者:
Booth R
中科院分区:
文献类型:
--
作者:
Booth R
We present a ‘two-fluid’ implementation of dust in smoothed particle hydrodynamics (SPH) in the test particle limit. The scheme is able to handle both short and long stopping times and reproduces the short friction time limit, which is not properly handled in other implementations. We apply novel tests to verify its accuracy and limitations, including multidimensional tests that have not been previously applied to the drag-coupled dust problem and which are particularly relevant to self-gravitating protoplanetary discs. Our tests demonstrate several key requirements for accurate simulations of gas–dust mixtures. First, in standard SPH particle jitter can degrade the dust solution, even when the gas density is well reproduced. The use of integral gradients, a Wendland kernel and a large number of neighbours can control this, albeit at a greater computational cost. Secondly, when it is necessary to limit the artificial viscosity we recommend using the Cullen & Dehnen switch, since the alternative, using α ∼ 0.1, can generate a large velocity noise up to σv≲ 0.3csin the dust particles. Thirdly, we find that an accurate dust density estimate requires >400 neighbours, since, unlike the gas, the dust particles do not feel regularization forces. This density noise applies to all particle-based two-fluid implementations of dust, irrespective of the hydro solver and could lead to numerically induced fragmentation. Although our tests show accurate dusty gas simulations are possible, care must be taken to minimize the contribution from numerical noise.
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DOI:
10.1017/s1743921311020709
发表时间:
2010
期刊:
Proceedings of the International Astronomical Union
影响因子:
--
作者:
F. Meru;M. Bate
通讯作者:
M. Bate
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
F. Meru;M. Bate
通讯作者:
M. Bate
DOI:
10.1111/j.1365-2966.2012.20819.x
发表时间:
2011-11
影响因子:
4.8
作者:
Justin I. Read;Justin I. Read;T. Hayfield;T. Hayfield
通讯作者:
Justin I. Read;Justin I. Read;T. Hayfield;T. Hayfield
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
G. Laibe;Daniel J. Price
通讯作者:
Daniel J. Price
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
A. Elvius
通讯作者:
A. Elvius