We compute the time average of the drag in two benchmark bluff body problems: a surface mounted cube at Reynolds number 40000, and a square cylinder at Reynolds number 22000, using Adaptive DNS/LES. In Adaptive DNS/LES the Galerkin least-squares finite element method is used, with adaptive mesh refinement until a given stopping criterion is satisfied. Both the mesh refinement criterion and the ...

Continuous cyclic bending (CCB) has been proposed as a useful straining technique to produce the high strain on the surface layers and the lower strain in the central layer of the sheet. A pure aluminum sheet is worked by the CCB using the ‘‘Roll traveling device’’ and ‘‘Roll driven machine’’. It is found that a sharp Cube orientation is formed by the CCB and subsequent annealing in the pure al...

This paper presents a calibration-free line-based tracking method to augment virtual objects into a video sequence. The presented method uses a cube on the first image to calibrate camera parameters. Then the 3D model for the cube is refined by adding 3D lines to its surface. For the remaining images in the sequence, the image lines are automatically detected and matched with their 3D correspon...

Phase errors in a Fizeau phase-shifting interferometer caused by multiple-reflected beams from a retroreflective optics, such as a corner cube and a right-angle prism, are studied. Single- and double-pass configurations are presented, and their measurement results are compared. An attenuator is not needed in a double-pass configuration because light is reflected by the retroreflective optics tw...

This paper covers the modeling and nonlinear attitude control of Cubli, a cube with three reaction wheels mounted on orthogonal faces that becomes wheel based 3D inverted pendulum when positioned in one its vertices. The proposed approach utilizes quaternions instead Euler angles as feedback states. A nice advantage quaternions, besides usual arguments to avoid singularities trigonometric funct...

Here by isometric we mean that the geodesic distance between pairs of points on the non-convex polyhedron is always equal to the geodesic distance between of the corresponding pairs of points on a cube. Alternatively, it means that two surfaces can be triangulated in such a way that they now consist of congruent triangles which are glued according to the same combinatorial rules. For example, i...

This paper presents a complete framework for creating speechenabled 2D and 3D avatars from a single image of a person. Our approach uses a generic facial motion model which represents deformations of the prototype face during speech. We have developed an HMM-based facial animation algorithm which takes into account both lexical stress and coarticulation. This algorithm produces realistic animat...

A method of fabricating micromachined Corner Cube Reflectors (CCRs) with high surface flatness and accurate control of mirror angle is demonstrated. A parallel, automated three-dimensional self-assembly process is presented, using bonded silicon-on-insulator material and out-of-plane rotation powered by the surface tension of thick photoresist pads. Precise alignment is achieved by minimising t...