Multipseudopotential interaction models for thermal lattice Boltzmann method simulations.
Multipseudopotential interaction models for thermal lattice Boltzmann method simulations.
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DOI：
10.1103/physreve.102.013311
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发表时间：
2020-07
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影响因子：
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通讯作者：
Kamil Pasieczynski;Baixin Chen
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文献类型：
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作者：
Kamil Pasieczynski;Baixin Chen
在这项工作中，在第一个实例中，多赝势相互作用（MPI）模型的能力扩展到流体动力学模拟。这是通过将MPI与多松弛时间碰撞算子和表面张力修改方法相结合来实现的。本文还提出了一种近似热力学一致性的方法，即把热力学一致性项分解成若干项。其中一项用于粒子间力的计算，第二项用于强迫方案。其次，将MPI与热力学模型相结合，模拟池沸腾过程中液滴蒸发和气泡成核。采用双分布函数热模型和混合热模型实现热耦合。结果表明，MPI热模型对液滴蒸发过程的描述符合D^{2}定律. MPI也被发现正确地模拟泡核池沸腾过程中的气泡成核和离开加热元件。可以认为，MPI热模型是比较更适合于热模拟在较低的温度比单一赝势相互作用模型，虽然这种情况下仍然非常具有挑战性。通过设置Peng-Robinson状态方程中的参数为a=1/6272和B=1/168，在降低的温度（T_{r}）为0.6时进行液滴蒸发模拟。
In this work, in the first instance, the multipseudopotential interaction (MPI) model's capabilities are extended for hydrodynamic simulations. This is achieved by combining MPI with the multiple-relaxation-time collision operator and with surface tension modification methods. A method of approaching thermodynamic consistency is also proposed, which consists of splitting the ɛ_{j} term into separate terms. One of these terms is used in the calculation of the interparticle force, and the second one is used in the forcing scheme. Secondly, MPI is combined with thermal models in order to simulate droplet evaporation and bubble nucleation in pool boiling. Thermal coupling is implemented using a double distribution function thermal model and a hybrid thermal model. It is found that MPI thermal models obey the D^{2}-law closely for droplet evaporation. MPI is also found to correctly simulate bubble nucleation and departure from the heating element during nucleate pool boiling. It can be suggested that MPI thermal models are comparatively better suited to thermal simulations at low reduced temperatures than single pseudopotential interaction models, although such cases remain very challenging. Droplet evaporation simulations are carried out at a reduced temperature (T_{r}) of 0.6 by setting the parameters in the Peng-Robinson equation of state to a=1/6272 and b=1/168.