A new meshing feature is present in ADINA 8.1 that enables the user to create a volume mesh from a collection of surface elements making up a closed volume. This is achieved without modifying the surface mesh. This feature is useful when a model is only represented by its external surface data (e.g., data from coordinate measuring machines, or CT scans). There are many potential applications, especially in the automotive and biomedical fields.
The FSI (fluid-structure interaction) solution capabilities of ADINA have been successfully applied to many applications in a wide range of industries over many decades. The ADINA FSI program uses the full capabilities of ADINA CFD and ADINA Structures, with solvers for full Navier-Stokes formulations of both compressible and incompressible fluids, Reynolds thin film fluids, porous medium fluids, etc. in the fluid model, and all the modeling and analytical tools available in ADINA Structures for the solid model.
The new surface tension option is implemented in the ADINA program, version 8.0. This new option allows the user to assign a surface tension value to selected lines (for 2-D planar and axisymmetric problems) or surfaces (for 3-D problems). The surface tension option can be used even if the boundaries undergo excessive deformation. This feature is useful in accurately modeling viscous materials such as cells, living tissues and heated glass. The effect of surface tension is also significant in MEMS sensors/actuators and other small-sized devices.
The animation shows the three stages of the artery simulation: stretching, uniform blood pressure rise, and several pressure cycles.
In recent years, engine manufacturers have strived to increase engine efficiency to reduce fuel consumption and emissions, for competitiveness and to meet strict government regulations. These advancements have led to highly stressed engine parts, in particular the crankshaft hydrodynamic bearings.
ADINA 8.1 has several enhancements to its cyclic symmetry analysis capabilities. The sparse and iterative solvers can now be used to solve cyclic problems. The primary cyclic component is no longer required to be aligned with the X-Y plane, and the axis of cyclic symmetry can have any orientation in space.
In ADINA v. 9.0, we introduced a new graphics engine that enables fast visualization and manipulation of large models in the ADINA User Interface (AUI). Since then, we have continued to make improvements so that FGM supports many more capabilities within the AUI. One recent major improvement is the creation of animations using the fast graphics engine which we will highlight in this Tech Brief. Animations created in standard graphics mode are essentially sequences of 2-D images displayed on the screen. Hence, during playback, the animation cannot be rotated or zoomed. In contrast, animations created in FGM are true 3-D animations which can be rotated, zoomed and moved to view any particular part of the model during playback as illustrated below. The first movie illustrates the ability to pause the animation and examine certain parts by zooming and rotating the model. In the second movie, the model is rotated and zoomed while the animation is in progress. https://blog.bentley.com/wp-content/uploads/3-d-animations-with-the-adina-fast-graphics-engine.mp4https://blog.bentley.com/wp-content/uploads/3-d-animations-with-the-adina-fast-graphics-engine_1.mp4 In ADINA v. 9.7, the following additional improvements were made to the creation and saving of 3-D animations in FGM. Animations can be created on multiple mesh plots A new playlist feature is available to manage multiple animations Animations stored in a
A new powerful stiffness matrix stabilization feature will be present in ADINA 8.2 to stabilize static analyses in the presence of physical rigid body modes. The new stabilization technique can be used with or without the modeling features already available in ADINA. The new technique makes complex analyses much simpler, is fully automatic and does not affect the solution. The animation shows a very simple metal stamping simulation, used merely for demonstration, where the workpiece is insufficiently supported. The results shown in this animation were obtained using the new stiffness matrix stabilization feature.
This animation shows unsteady flow in chambers connected by valves and a piston. The left chamber has an inlet and the right chamber has an outlet. As the piston moves down, the left valve opens, the right valve closes, and gas is sucked through the inlet into the left chamber and the piston. As the piston moves up, the left valve closes, the right valve opens and gas is pushed through the open valve into the right chamber and the outlet. Particles are injected at a fixed rate from the inlet. The particle motions clearly show the path of the gas through the chambers, valves and piston.