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Because of the advantages of good physical conservation and grid suitability along with low demand on computational consumption, VOF is now the main numerical method for the treatment of free-surface in ship hydrodynamics. But for the original VOF method, the problem of interface diffusion is rather serious and results in excessive thickness and insufficient resolution for interface simulation. It will also affect the computational precision of other correlative variables in the flow filed. This problem is especially serious in the simulation of unsteady free-surface flow. In this paper, anti-diffusion VOF method was developed by introducing an artificial convective term into the control equation to restrain interface diffusion and reduce interface thickness. Implicit scheme was adopted for discretization of the artificial convective term to ensure computational stability. The method was tested by typical cases of Zalesak and shear field under different meshes. The results show that the interface thickness is reduced remarkably and the mass error is also reduced obviously. The simulations of 3-dimensional test cases for dam break and flooding in damaged cabin show that the anti-diffusion VOF method can capture the free-surface better and improve computational precision in the CFD simulation of practical unsteady free-surface flow.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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