Also know as by US NAVY users

A Three-Dimensional Free Surface and Bubble Dynamics Code

3D Bubble in a Tip Vortex - 3DYNAFS© (2MB)	Multiple Bubble Explosion Study (2MB)

- To compute the motion and deformation of all moving boundaries and the resulting flow and pressure fields.
- Both codes use adaptive time stepping based on a change in the velocity potential as well as a number of smoothing options.

The model, based on the BEM, utilizes Green's identity to reduce the number of dimensions of the problem by one. A potential field problem is reduced to a solution of the potential and its normal derivative along the boundary of the domain. Thus a three-dimensional problem is transformed into a two-dimensional boundary calculation while a two-dimensional problem becomes a one-dimensional calculation. This results in drastic reduction in computational time compared with other types of hydrodynamic codes, making it feasible to run versions of the code on workstations and high end PCs. Due to detailed research in the area of hydrodynamic modeling by DYNAFLOW, INC.® using 2DYNAFS© and 3DYNAFS©, we have adapted our codes for various applications and are willing to customize to fit the needs of our customers. We are also able to offer post-processing software custom designed for compatibility with these codes, including 3DYNAPL®©, a three dimensional PC plotting package.
	Ring vortex formed at the exit of a tube
Predicted wave pattern around a Wigley hull	Comparison of the predicted and experimental wave profile along the Wigley hull
Typical Applications Include: Explosions Near Bodies and Ocean Surface Waves Generated by a Body Motion Breaking Waves on a Sloped Beach Bubble Deformation in Non Uniform Flow Fields Multi Bubble Interaction Interaction Between Free Surfaces and Vortical Flow Field Fluid Structure Interactions  Cavitation Inception and Noise
	Interaction of a bubble and a submerged cylinder (834KB)

References:

1. See Write-up from Physics World
2. See Write-up from Oil Online
3. See Write-up from Scientific Computing World
4. See Write-up from Scientific Computing & Instrumentation
5. Hsiao, C. -T., Annasami, R., “Preprocessing Programs for 3DYNAFS© Hydrodynamics Version G.03 – User manual,” DYNAFLOW, INC., July 2005.
6. Choi, J.-K., Hsiao C. -T., Chahine G. L., “Design trade-off Analysis of High Performance Ship Hull with Air Plenums,” 2nd International Symposium on Seawater Drag Reduction, Busan, Korea, 23-26 May 2005.
7. Choi, J.-K., Hsiao C. –T., Chahine, G.L., “Design Trade-off Analysis for High Performance Ship Hull with Air Plenums,” Report No. 2M3028-2-ONR, DYNAFLOW, INC., June. 2004.
8. Choi, J.-K., Hsiao C. -T Chahine, G.L., “Design Trade-off Analysis for High Performance Ship Hull with Air Plenums,” Report No. 2M3028-1-ONR, DYNAFLOW, INC., Mar. 2004
9. Chahine, G. L., Hsiao C. –T., Choi, J.-K.,, Tanguay, M., Wu, X., Annasami, R., “A Computational Tool for Simulating Hydrodynamics Behavior of Multiple Vessels in a Harbor,” Report No. 2M2016-1-NOAA, DYNAFLOW, INC., 2004.
10. Chahine, G.L., Annasami, R., Hsiao, C.-T., Harris, G, “Scaling of the Re-Entering Jet Parameters of an Underwater Explosion Bubble below Floating and Submerged Structures,” 74th Shock and Vibration Symposium, San Diego, CA. October 27-31, 2003
11. Chahine, G. L., Wu, X., Choi, J.- K., “Development of a PC based multi-ship maneuvering simulator for improving navigation traffic within ports and harbors,” Report No.2M2012-NOAA, DYNAFLOW, INC., January 2003.
12. Chahine, G.L., Kalumuck, K.M., Hsiao, C.-T., “Simulation of surface piercing body coupled response to underwater bubble dynamics utilizing 3DynaFS, a three-dimensional BEM code,” Computational Mechanics, 32, no.4-6, pp. 319-326, 2003.
13. Chahine, G.L., Choi, J.-K., “Non-spherical bubble behavior in vortex flow fields,” Computational Mechanics, 32, no.4-6, pp. 281-290, 2003.
14. F. D’Este , G. Contento, “Time domain linear and weakly nonlinear coupled wave resistance and seakeeping computations”, Science and Supercomputing at CINECA, Report, 2003.
15. Cheng, J.- Y., Chahine, G. L., Kalamuck, K. M., “Computation of hydrodynamic characteristics of a floating amphibious vehicle using BEM,” Proceedings of the 14th International Conference of Boundary Element Technology, Orlando, Fl., 2001.
16. Cheng, J.-Y. Chahine, G.L., “Computational hydrodynamics of animal swimming: boundary element method and three-dimensional vortex wake structure,” Comparative Biochemistry and Physiology, 131, pp. 51-60, 2001.
17. Chahine, G.L., Kalumuck, K.M., “The Influence of Structural Deformation on Water Jet Impact Loading,” Journal of Fluids and Structures, 12, pp. 103-121, 1998.
18. Chahine, G.L., Kalumuck, K.M., “BEM Software for Free Surface Flow Simulation Including Fluid-Structure Interaction Effects,” International Journal of Computer Applications for Technology, 11, pp.177-198, 1998.
19. Chahine, G.L., “Numerical and Experimental Study of Explosion Bubble Crown Jetting Behavior,” DYNAFLOW, INC. Technical Report 96003-1, 1997.
20. Chahine, G.L., Prabhukumar, S., and Duraiswami, R., “Bubble Dynamics Near a Cylindrical Body: 3-D Boundary Element Simulation of the ONR Snay / Goertner Bubble Benchmark Problem”, SAVIAC Proceedings of the 67th Shock and Vibration Symposium, Volume II, Monterey, CA, 1996.
21. Chahine, G.L., “Bubble Interaction with Vortices” “Fluid Vortices”, Chapter 18, S. Green (Ed.), Kluwer Academic, 1995
22. Chahine, G.L., and Duraiswami, R, “Boundary Element Method for Calculating 2-D and 3-D Underwater Explosion Bubble Behavior in Free Water and Near Structures,” DYNAFLOW, INC. Technical Report NSWCDD/TR-93/94, 1993.
23. Zhang, S., Duncan, J. and Chahine, G.L., “The Final Stage of the Collapse of a Cavitation Bubble Near a Rigid Wall”, J. Fluid Mech., vol. 257, 1993
24. Chahine, G.L., “A Numerical Model for Three-Dimensional Bubble Dynamics in Complex Geometries”, 22nd American Towing Tank Conference, St. Johns, Newfoundland, Canada, August 1989.
25. Chahine, G.L. and T.O. Perdue, “Simulation of the Three-Dimensional Behavior of an Unsteady Large Bubble Near a Structure”, in “Drops and Bubbles”, edited by T.G. Wang, A.I.P. Conference Proceedings, 197, 169-187, 1989.
26. Lewis, E. V (Ed)., “Principles of Naval Architecture,” The Society of Naval Architects and Marine Engineers, 1988.
27. SBIR Award: DoC Phase I A Computational Tool for Simulating Hydrodynamic Behavior of Multiple Vessels in a Harbor
28. SBIR Award: ONR Phase I Design Trade-off Analysis for High Performance Ship Hull with Air Plenums
29. SBIR Award: NSWC Phase I Development of a Non-Explosive Ship Shock Testing System

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