Dynaflow, Inc.

DYNAJETS High-Efficiency Water Jet Nozzles
The DYNAJETS high-efficiency water jet nozzles produce an extremely erosive environment, enabling significant increases in cleaning, cutting and drilling rates over conventional jet nozzles. They employ cavitation, acoustic excitation, and turbulent jet interruption and structuring through passive manipulation of the flow to create large high-frequency stresses on the target surface or in the liquid. This is accomplished completely by interaction of the liquid with the nozzle geometry and involves no moving parts or additional power source.

2DynaFS/3DynaFS
Designed to simulate unsteady incompressible fluid flows in the presence of free surfaces, such as those encountered in multiphase flows, the 2DynaFS/3DynaFS is a suite of boundary-element-method based computational fluid dynamics (CFD) codes. They are capable of handling the dynamics of single or multiple bubbles near solid boundaries or free surfaces. The codes can also process bubble dynamics near a submerged object and deformation in a non-union fluid flow, the dynamics of free surface waves, and the generation of surface waves by a floating or submerged body motion. 2DynaFS is an axisymmetric version of 3DynaFS with an easy-to-use graphical user interface.

DynaEIT
DynaEIT is a suite of algorithms designed to solve electrical impedance tomography (EIT) problems. In EIT, the distribution of conductivity inside a container is determined by applying currents (or voltages) at locations along the container surface and measuring the voltages (or currents) at other locations. Equations for the electric field then provide relationships between measured voltages and currents and the conductivity distribution inside the domain. Because different materials have different conductivities, EIT produces a conductivity map that provides an image of the material distribution in the container. The DynaEIT software makes use of both the dipole approximation method and a singular boundary-element method to rapidly solve the “forward” problem of determining voltage and current distributions for a known conductivity distribution in the imaged domain in two and three dimensions. The inverse problem of image reconstruction using the measured voltages and/or currents is solved by multi-dimensional minimization procedures, such as Powell’s direction set method, the downhill simplex method, genetic algorithms and multi-objective minimization based on Pareto sets. These algorithms are suitable for non-destructive evaluation of structures and materials, multi-phase flows in the oil and gas, chemical and energy industries, imaging of container leakage, and detection of chemical reactive flows.

DF_Contour
DF_Contour generates publication-ready graphs and contours from numerical and experimental data. It can also produce a screen animation of a succession of color maps or graphs. This simple and inexpensive tool can be used to represent and analyze up to 16 different data sets or graphs simultaneously. A user needs to input ASCII-formatted data with a one-word descriptor (e.g., #vector, #scalar) before each dataset for DF_Contour to identify the type of data and represent it properly. These types include vector and scalar fields, shapes, curves and markers. The intuitive software followsfamiliar Windows interface and commands.

Specialized Materials Testing
This firm’s services include standard ASTM G-32, G-73, and G-134 testing, as well as customized testing for cavitation and liquid-impact erosion using ultrasonic, water jet and whirling disk devices. Cavitation erosion can be assessed at pressures from ambient to 2,800 psi. Evaluations can be made in different liquids and at different controlled temperatures. Using a split Hopkinson pressure bar, material properties at high rates of strain (~3,000/s) can be measured.