Benchmark of DARTS for buoyancy and capillarity

Modified data set supporting our publication in SPE Journal "Operator-Based Linearization Approach for Modeling of Multiphase Flow with Buoyancy and Capillarity". The modification is related to single thread (instead of multi-thread used in publication) run and utilization of normal OBL mesh (instead of logarithmic used in publication).

本修改数据集用于支撑我们发表于《SPE期刊》（SPE Journal）的论文《考虑浮力与毛细作用的多相流建模算子基线性化方法》。本次修改包含两处调整：其一为采用单线程运行（替代原论文中使用的多线程模式）；其二为使用普通OBL网格（Operator-Based Linearization网格，替代原论文中采用的对数网格）。