Open AccessNon-equilibrium molecular dynamics simulation for mechanism and drag reduction of underwater supercavitation in open system
Author(s) -
Bo-Zhi Gong,
Bingjian Zhang
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.1504
Subject(s) - supercavitation , mechanics , drag , cavitation , reduction (mathematics) , computer simulation , flow (mathematics) , volume (thermodynamics) , underwater , drag coefficient , materials science , physics , thermodynamics , geology , geometry , oceanography , mathematics
Non-equilibrium molecular dynamics was introduced for studying supercavitation mechanism and its drag reduction effect. Flow field details like local density distributionlocal cavity number distributionfriction coefficient and gas volume percentage were calculated. The results showed that cavity number criterion is applicable in predicting supercavitation. Low cavity number area and actual cavity area are spatially separated. Velocity was the critical factor on cavity formation. Cavitator shape can affect gas volume percentage in cavity. Supercavitation can bring about 50%—90% skin friction reductioncomparing with cloud cavitation. The results agree with previous numerical simulationshowing the model is suitable for studying supercavitation mechanism in molecular scale and provides a valuable tool for investigating flow details.