Sun, R. & Chwang, A. T. 1997 Complex velocity potential for an ellipse and a circle in translation and rotation. Communications in Nonlinear Science & Numerical Simulation 2(4), 252-255.
Sun, R. & Chwang, A. T. 1999 Interaction between rotating elliptic cylinder and fixed circular cylinder. Journal of Engineering Mechanics 125(7), 761-767.
Sun, R. & Chwang, A. T. 2000 Hydrodynamic interaction between two cylinders with rotation. Journal of the Physical Society of Japan 70 (1), 91-102.
Sun, R. & Chwang, A. T. 2001 Hydrodynamic interaction between a slightly distorted sphere and a fixed sphere. Theoretical and Computational Fluid Dynamics 15, 11-22.
Sun, R. & Hu, W. R. 2002 The thermocapillary migrations of two bubbles in a microgravity environment. Journal of Colloid and Interface Science 255, 375-381.
Sun, R. & Hu, W. R. 2003 Planar thermocapillary migration of two bubbles in microgravity environment. Physics of Fluids 15 (10), 3015-3027.
Sun, R. & Chwang, A. T. 2005 The cohesion and re-separation of particles in slow viscous flows. In “Advances in Engineering Mechanics—Reflections and Outlooks—In Honor of Theodore Y-T. Wu”, edited by A. T. Chwang, M. H. Teng and D. T. Valentine (World Scientific Publishing Co. Pte. Ltd., Singapore, 2005), 651-659.
Sun, R. 2005 Force on a droplet in another liquid with arbitrary arrangement of the gravity and thermal gradient. Modern Physics Letters B 19 (28-29), 1671-1674.
Sun, R. & Chwang, A.T. 2006 Hydrodynamic interaction between a prolate spheroid and a sphere. Structural Control and Health Monitoring 13 (1), 147-168.
Sun, Ren & Chwang, A. T. 2006 Interactions and collisions of two solid spheres in the gravitational environment. Proceeding of the 7th International Conference on Hydrodynamics, (Keynote speech on The 7th International Conference on Hydrodynamics)
Sun, R. & Chwang, A. T. 2007 Interactions between two touching spherical particles in sedimentation. Physical Review E 76 (4), 046316-1-046316-10.
Sun, Ren. 2008 Planar Migration of Two Drops in a Thermal Gradient. Proceedings of the 22nd International Congress of Theoretical and Applied Mechanics (ICTAM2008)
Sun, R. & Ng, C.O. 2012 Hydrodynamic interactions among multiple circular cylinders in an inviscid flow. Journal of Fluid Mechanics 712, 505-530.