This study investigates the flow characteristics of asymmetric multi-stage orifices using computational fluid dynamics (CFD). Three-dimensional models with two to four asymmetric orifices were developed in ANSYS Workbench, and a transient analysis was conducted with the SST turbulence model. Sweep mesh and inflation mesh techniques were applied to capture the flow behaviors near the orifices and within the boundary layer. The results showed that the outlet pressure decreased as the number of asymmetric stages increased. Pressure hunting analysis revealed that the two-stage model exhibited the most stable performance with minimal fluctuation, while the three- and four-stage models showed higher amplitude variations. Velocity distribution and turbulence characteristics confirmed that additional stages increased the maximum velocity and eddy viscosity, and complex streamlines were observed near the orifices. These findings provide insights into the design and optimization of multi-stage asymmetric orifices for stable fluid flow control.

Abstract
1. 서 론
2. 유동해석
    2.1 Geometry
    2.2 Mesh
    2.3 CFX-Pre
    2.4 CFX result
3. 결 론
References

• 곽효서(Assistant professor, Mechanical Engineering Major, Dong-Eui University) | Hyo-seo Kwak Corresponding author