中国计量大学学报2025，Vol.36Issue(4)：541-549,9.DOI:10.3969/j.issn.2096-2835.2025.04.006
不同流速下牙根管冲洗数值模型的适用性研究
Investigation of the applicability of numerical simulation models for root canal irrigation under varying flow rates
摘要
Abstract
Aims:This study aimed to investigate the applicability of three turbulence models in simulating root canal irrigation under different irrigant flow rates(5,8.6,10,and 15 m/s),with particular focus on their differences in computational accuracy and efficiency.Methods:A maxillary first molar prepared to size 15/04(apical diameter 0.15 mm,taper 4％)was selected as the study object;and a three-dimensional model was reconstructed based on micro-computed tomography(Micro-CT)images.The DNS results were used as the reference benchmark,while three turbulence models—large eddy simulation(LES),shear stress transport(SST),and the renormalization group(RNG)—were employed to evaluate their predictive accuracy and computational efficiency under different inlet velocities.Results:The RNG model exhibited early emergence of irrigation dead zones across all velocities,with limited stability and accuracy.The SST model showed stronger capability in capturing wall shear stress at low velocities;but its predictive accuracy declined as the inlet velocity increased.The LES method maintained good consistency in the medium-to-high velocity range,with results most consistent with DNS,demonstrating superior adaptability and accuracy.Conclusions:The LES model shows the closest agreement with DNS in terms of velocity distribution accuracy,followed by the SST model,while the RNG model exhibits larger deviations.In terms of computational efficiency,the RNG model is the most economical as the SST model requires about 20％of the LES computation time and the LES model has the highest computational cost.Considering both accuracy and efficiency,the SST model demonstrates a better balance under low flow-rate conditions(5～8.6 m/s)and is more suitable for low-speed irrigation simulations,whereas the LES model provides higher predictive accuracy under high flow-rate conditions(10～15 m/s)and is therefore more appropriate for high-speed irrigation simulations.It should be noted that the superior accuracy of the LES model partly results from its finer mesh resolution,which allows it to capture velocity variations in high-speed flows more clearly and to more realistically reproduce the fluid motion within the root canal.Therefore,when evaluating the performance of different turbulence models,both computational accuracy and efficiency,as well as the influence of mesh resolution,should be considered in balance.关键词
根管冲洗/计算流体力学/湍流模型/直接数值模拟/大涡模拟Key words
root canal irrigation/computational fluid dynamics/turbulence models/direct numerical simulation/large eddy simulation分类
数理科学引用本文复制引用
李艺,魏源,陈冬梅,赵梦蝶,刘岳燕..不同流速下牙根管冲洗数值模型的适用性研究[J].中国计量大学学报,2025,36(4):541-549,9.基金项目
浙江省自然科学基金项目(No.12472258) （No.12472258）
