一种可应用于内燃机瞬态仿真的动网格模型

摘要

提出了一种基于非结构网格的动态层网格实现算法,结合滑移网格算法构建了基于分块滑移动态层的非结构化内燃机动网格模型,并基于TBD620柴油机建立了计算模型,所有算法都基于课题组自主研发的通用输运方程求解软件实现.流场计算采用适用于可压缩流场的有限体积法及SIMPLE算法.通过数值算例对所开发的滑移网格模型和动态层网格模型进行了验证,最后对内燃机缸内瞬态流场进行了仿真.计算结果表明,所发展的非结构化动网格模型可应用于内燃机瞬态流场的仿真.%A new dynamic layer mesh algorithm based on unstructured mesh was introduced and the dynamic mesh model of internal combustion engine(ICE) was built by combining the sliding mesh algorithm based on the sliding dynamic layer .The calculation model of TBD620 diesel engine was further established and all the referred algorithms were realized through the self-developed general transport equation solver .The finite volume method and SIMPLE algorithm for the compressible fluid were utilized in the simulation .Moreover ,the sliding mesh model and dynamic layer mesh model were verified through the numerical examples and finally the in-cylinder transient flow field of ICE was simulated .The results show that the introduced dynamic mesh method can realize the transient flow field simulation of ICE .