Time-dependent and outflow boundary conditions for Dissipative Particle Dynamics.
Time-dependent and outflow boundary conditions for Dissipative Particle Dynamics.
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DOI：
10.1016/j.jcp.2011.02.003
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发表时间：
2011-05-31
影响因子：
4.1
通讯作者：
Karniadakis, George Em
中科院分区：
文献类型：
--
作者：
Lei, Huan;Fedosov, Dmitry A.;Karniadakis, George Em
对于耗散粒子动力学(DPD)流体系统，我们提出了一种在流体-壁面界面和充分发展区域的流出边界施加无滑移边界条件的简单方法。实施无滑移条件的步骤是基于速度相关的剪切力，该剪切力是表示固壁颗粒的存在并保持局部热力学一致性的广义力。结果表明，该方法既适用于定常流体系统，也适用于含时流体系统，并将DPD结果与连续介质极限(Navier-Stokes)结果进行了比较。我们还发展了一种力自适应方法来施加完全发展的流的流出边界条件，该流出流的速度分布或压力值未知。我们使用两种不同流量的新边界方法的组合来研究后向台阶上的流动和理想动脉分叉中的流动。最后，我们探讨了外流方法在含时流动系统中的适用性。流出边界法适用于沃姆斯利数为O(1)的系统，即当流出流处的压力和流量近似同步时。
We propose a simple method to impose both no-slip boundary conditions at fluid-wall interfaces and at outflow boundaries in fully developed regions for Dissipative Particle Dynamics (DPD) fluid systems. The procedure to enforce the no-slip condition is based on a velocity-dependent shear force, which is a generalized force to represent the presence of the solid-wall particles and to maintain locally thermodynamic consistency. We show that this method can be implemented in both steady and time-dependent fluid systems and compare the DPD results with the continuum limit (Navier-Stokes) results. We also develop a force-adaptive method to impose the outflow boundary conditions for fully developed flow with unspecified outflow velocity profile or pressure value. We study flows over the backward-facing step and in idealized arterial bifurcations using a combination of the two new boundary methods with different flow rates. Finally, we explore the applicability of the outflow method in time-dependent flow systems. The outflow boundary method works well for systems with Womersley number of O(1), i.e., when the pressure and flowrate at the outflow are approximately in-phase.
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影响因子：
1.8
作者：
Smiatek, J.;Allen, M. P.;Schmid, F.
通讯作者：
Schmid, F.
影响因子：
3.8
作者：
Barber, Jared O.;Alberding, Jonathan P.;Restrepo, Juan M.;Secomb, Timothy W.
通讯作者：
Secomb, Timothy W.
DOI：
10.1103/physreve.81.026704
发表时间：
2010-02
期刊：
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子：
--
作者：
Lei H;Caswell B;Karniadakis GE
通讯作者：
Karniadakis GE
影响因子：
2.4
作者：
Boek, ES;Coveney, PV;vanderSchoot, P
通讯作者：
vanderSchoot, P
影响因子：
1.9
作者：
Revenga, M;Zúñiga, I;Pagonabarraga, I
通讯作者：
Pagonabarraga, I