Dynaflow, Inc. software

3DynaFS-Bem is a general-purpose simulation tool for nonlinear dynamics of 3D free surface flows and their interactions with submerged or floating structures.

The 3DynaFS © viscous module solves the incompressible Navier-Stokes equations using an artificial compressibility method. The solution procedure can be marched in pseudo-time to reach a steady-state solution or can use a dual time-stepping scheme to obtain a time-dependent solution. The code uses a first-order Euler implicit time-difference scheme, a third-order accurate flux-difference upwind splitting scheme for convection terms, and a second-order central differencing for the viscous terms.

3DynaFS-Comp - The 3DynaFS compressible flow module solves the Euler equations using a 2nd order Godunov-type method to capture accurately the location of discontinuities such as shock waves and contact surfaces. The code uses a Level Set method and a mixed cell algorithm to simulate multi-phase and multi-material flows. A general Equation of State is used for describing various fluids and fluid like solids. This module is also capable of simulating pressure wave propagation through bubbly media including shock waves, large liquid/gas interface deformations and cavitation induced by expansion waves .

3DynaFS-Fsi is the fluid structure interaction module of 3DynaFS allowing the fluid modules to interact with a structure code through a coupler interface using either MPI or a file passing scheme. 3DynaFS-Fsi currently couples the 3DynaFS-Bem module with a six-degrees of freedom rigid body motion solver or with existing structure codes including Dyna3D1 developed by Laurence Livermore National Laboratories, SALINAS2 developed by Sandia National Laboratories , and DLEARN3, a public domain linear static and dynamic finite element analysis program.The six-degree of freedom rigid body motion solver is included in the FSI module, while the user can procure/ provide the structure code if solving a deformable structure problem is desired. The coupler interface routines are provided with 3DynaFS-Fsi and enable the user to integrate with own structure code to communicate with the 3DynaFS-Bem module.

3DynaFS-Dsm is a module to simulate complex flows involving separation areas and particle tracking dynamics including bubbly flow. This involves a Vortex Element Method to simulate shear layers and a Discrete Bubble Module and Discrete Particle Module to track bubble dynamics and particle trajectories and their interactions.