Grid Independence Validation and Numerical Simulation of an Opposed-Piston Free-Piston Engine Nanjing University of Science and Technology School of Mecha

Format:

Book

Conference/Event

Author/Creator:

Liu, Shuangshuang, author.

Contributor:

Liu, Liang

Xu, Zhaoping

Conference Name:

Automotive Technical Papers (2021-01-01 : Warrendale, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

To evaluate the grid independence of the in-cylinder numerical simulation, the combustion chamber model of an opposed-piston free-piston engine was divided into three styles: structured, unstructured, and hybrid meshes. Furthermore, the grid independence of the hybrid mesh was analyzed using different grid resolutions. In order to avoid the influence of subjective judgments, the grid resolution is introduced to characterize the degree of grid refinement, combined with the grid convergence index (GCI) to assess the convergence of simulation. The results show that there are differences in the flow fields for the different grid styles. In addition, the hybrid mesh captured more small-scale swirls around the intake and exhaust portraits When the resolution reached 12, the GCI was less than 6%, indicating that the numerical simulation was impervious to the grid resolution. Moreover, the mixing distribution hardly changed when the resolution reached 12

Notes:

Vendor supplied data

Publisher Number:

2021-01-5104

Access Restriction:

Restricted for use by site license