Numerical exploration of first-order relativistic hydrodynamics
Numerical exploration of first-order relativistic hydrodynamics
复制标题
一阶相对论流体动力学的数值探索
DOI:
10.1103/physrevd.104.023015
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发表时间:
2021
影响因子:
5
通讯作者:
Pretorius, Frans
中科院分区:
文献类型:
--
作者:
Pandya, Alex;Pretorius, Frans
We present the first numerical solutions of the causal, stable relativistic Navier-Stokes equations as formulated by Bemfica, Disconzi, Noronha, and Kovtun (BDNK). For this initial investigation we restrict to plane-symmetric configurations of a conformal fluid in Minkowski spacetime. We consider evolution of three classes of initial data: a smooth (initially) stationary concentration of energy, a standard shock tube setup, and a smooth shockwave setup. We compare these solutions to those obtained with a code based on the Müller-Israel-Stewart (MIS) formalism, variants of which are the common tools used today to model relativistic, viscous fluids. We find that for the two smooth initial data cases, simple finite difference methods are adequate to obtain stable, convergent solutions to the BDNK equations. For low viscosity, the MIS and BDNK evolutions show good agreement. At high viscosity the solutions begin to differ in regions with large gradients, and there the BDNK solutions can (as expected) exhibit violation of the weak energy condition. This behavior is transient, and the solutions evolve toward a hydrodynamic regime in a way reminiscent of an approach to a universal attractor. For the shockwave problem, we give evidence that if a hydrodynamic frame is chosen so that the maximum characteristic speed of the BDNK system is the speed of light (or larger), arbitrarily strong shockwaves are smoothly resolved. Regarding the shock tube problem, it is unclear whether discontinuous initial data is mathematically well-posed for the BDNK system, even in a weak sense. Nevertheless we attempt numerical solution, and then need to treat the perfect fluid terms using high-resolution shock-capturing (HRSC) methods. When such methods can successfully evolve the solution beyond the initial time, subsequent evolution agrees with corresponding MIS solutions, as well as the perfect fluid solution in the limit of zero viscosity.
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DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
M. Gazdzicki;M. Gorenstein
通讯作者:
M. Gorenstein
影响因子:
4.1
作者:
ROE, PL
通讯作者:
ROE, PL
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
I. Brevik;O. Gron
通讯作者:
O. Gron
DOI:
10.1098/rspa.2014.0055
发表时间:
2014
期刊:
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
影响因子:
--
作者:
H. Freistühler;B. Temple
通讯作者:
B. Temple
DOI:
--
发表时间:
2018
期刊:
Journal of Mathematics and Physics
影响因子:
--
作者:
H. Freistühler;B. Temple
通讯作者:
B. Temple